Relevant bibliographies by topics / Dental implant / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Dental implant.

Dissertations / Theses on the topic 'Dental implant'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 June 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Dental implant.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Hultin, Margareta. "Factors affecting peri-implant tissue reactions /." Stockholm, 2001. http://diss.kib.ki.se/2001/91-628-4761-9/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Vermeulen, Lisa. "Development of a radiographic dental implant guide for forensic identification using current dental implants." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2755.

Full text
Abstract:
Thesis (MSc (Radiography))--Cape Peninsula University of Technology, 2018.
Introduction: Forensic dentistry plays a key role in identifying human remains that cannot be identified visually or by other means. Studies have shown that in cases of single or multiple deaths, scientific identification of human remains utilising forensic dentistry is often the most successful source of identification. Dental identification of human remains consists of a very complex procedure that makes it necessary during the investigation process to use and compare unique dental identifiers. A reliable and accurate method of identifying human remains is a positive radiological identification between ante-mortem and post-mortem images of dental radiographic images. Even if ante-mortem radiographic images may not be present during the identification process, post-mortem images may include details of dental restorations such as dental implants which cannot be seen during visual examination. The different types of dental implants vary in morphology and in conjunction with the unique appearance of dental anatomy and the placement of custom restorations such as dental implants, it has been found to accurately assist in the identification of human remains. Objectives: To establish a radiographic dental implant guide for ten commonly used dental implant types in the Western Cape, South Africa; and to identify and describe the morphological characteristics of these dental implant types as observed on pantomographs. Methods: The ten commonly used dental implant types were imaged radiographically to create a reference instrument which served as a tool for identifying and comparing different types of dental implants. The morphologies of the different dental implants, specifically the apex, thread and neck, were observed on ante-mortem pantomographs and compared to the appearance of the dental implants on the reference instrument to make a positive match. The straight tube image of all ten dental implant types in the reference instrument was used as the point of reference to positively identify the morphological characteristics of each dental implant type on the pantomographs. The morphological characteristics of the ten commonly used dental implant types used in the Western Cape were described and based on this a radiographic dental implant guide was developed. Results: A total of 384 dental implants were observed on the pantomographs. Of these, 380 dental implants could be positively identified on the pantomographs while 4 dental implants could not. A total of 350 dental implants (91%) were identified as dental implant types listed in the reference instrument while 30 dental implants were identified as a dental implant type not listed in the reference instrument. A total of 208 dental implants (54.2%) could be positively identified using the morphological characteristics namely the apex, thread and neck on the straight tube images of the dental implant type in the reference instrument. The radiographic dental implant guide was developed based on positive identification of the morphological characteristics of the dental implant types. Conclusion: This research study has illustrated that the morphology of dental implants can be used to differentiate between different dental implant types on pantomographs. Each dental implant type had unique morphological characteristics as well as similarities which enabled distinction between the different dental implant types, which facilitated dental implant identification and the development of a radiographic dental implant guide. The radiographic dental implant guide developed as part of this research study, may be useful in the field of forensic dentistry and forensic radiology.
APA, Harvard, Vancouver, ISO, and other styles
3

O'Sullivan, Dominic. "The effect of implant geometry upon the primary stability of dental implants." Thesis, University of Bristol, 2001. http://hdl.handle.net/1983/339010c1-63ee-4eb9-b03c-b3a2b9b89dbf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Oliveira, Gustavo Augusto Grossi de. "Efeito da superfície hidrofílica na osseointegração de implantes em sítios com defeitos ósseos circunferenciais: estudo experimental em cães." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/58/58136/tde-08032013-091728/.

Full text
Abstract:
INTRODUÇÃO: A qualidade da interface osso-implante pode ser influenciada diretamente por aspectos inerentes ao tratamento da superfície do titânio e determina a forma que as células interagem, aderem e se fixam a ela, podendo potencializar e encurtar o tempo de osseointegração. Este estudo propôs-se a analisar alterações na osseointegração produzidas pela hidrofibilidade das superfícies dos implantes Neoss®. MATERIAIS E MÉTODOS: Foram utilizados 6 cães da raça labrador e instalados 44 implantes Neoss® bilateralmente na mandíbula com defeitos ósseos padronizados na região coronal: 22 implantes apresentavam superfície ProActive (hidrofílica) e outros 22 implantes eram de superfície Bimodal (hidrofóbica). Foram avaliados a resposta biológica nos períodos de uma semana e quatro semanas de osseointegração, utilizando parâmetros histológicos, histomorfométricos, fluorescência e de estabilidade mecânica aferido pelo método de análise de frequência de ressonância (RFA). As superfícies também foram submetidas à análise topográfica por interferometria óptica e quanto a propriedade de hidrofibilidade. RESULTADOS: Nos testes topográficos, a superfície ProActive apresentou valor de Sa de 0,4m contra Sa de 0,8m da superfície Bimodal, sugerindo menor rugosidade da superfície hidrofílica. A umectibillidade da superfície foi maior no grupo ProActive, exibindo valores de ângulos de contato de 27,2° contra 67,2° da superfície Bimodal. Ambas as superfícies apresentaram valores semelhantes nos períodos de uma e quatro semanas no que diz respeito à estabilidade mecânica do implante, aferidos com o RFA e nos parâmetros histomorfométricos em relação deposição óssea ao seu redor CONCLUSÕES: 1) A superfície ProActive apresentou valores menores de rugosidade e aumento da umectibilidade em relação aos implantes com superfície Bimodal. 2) A superfície ProActive utilizada no presente estudo não favoreceu os eventos de osseointegração nas condições períodos de 1 e 4 semanas avaliados. 3) Após 4 semanas de osseointegração, ocorreu aumento da estabilidade dos implantes instalados sem haver diferença entre as superfícies ProActive e Bimodal. 4) A estabilidade dos implantes, avaliados por meio do RFA, aumentou gradativamente durante a osseointegração, sem haver diferença entre as superfícies testadas.
INTRODUCTION: The quality of the bone-implant interface can be directly influenced by factors inherent to titanium surface treatment which determines cells interaction and adherence to shortening the time for osseointegration. This study aimed to assess changes on osseointegration produced by the hidrophibility of Neoss® implants surfaces. MATERIALS AND METHODS: Six labrador dogs were used and 44 Neoss® implants bilaterally installed in the mandible (ProActive with hydrophilic surface) and (Bimodal hydrophobic surface), in standardized bone defects in the coronal region. The biological responses in one and four weeks of osseointegration were evaluated using histological, histomorphometric, fluorescence analysis and mechanical stability measured by Resonance Frequency Analysis (RFA). The surfaces were also subjected to topographic analysis by optical interferometry and hydrophobicity by wettability analysis. RESULTS: The topographic surfaces test showed value of 0.4 micrometers for ProActive implants, against 0.8 micrometers for Bimodal implants, suggesting less hydrophilic surface roughness in the former (p0.05). The wettability values were higher in ProActive surface, with contact angles of 27.2° versus 67.2° of the Bimodal surface (p0.05). Both implant surfaces exhibited similar mechanical stability measured by RFA, as well as the histomorphometric parameters related to bone deposition onto the surfaces. CONCLUSIONS: 1) The ProActive surface showed lower roughness values and increased wettability compared to Bimodal surface. 2) The ProActive surface did not favor osseointegration at 1 and 4 weeks. 3) After 4 weeks of osseointegration the implants increased in stability, with no statistical differences between Bimodal and ProActive surfaces
APA, Harvard, Vancouver, ISO, and other styles
5

Santiago, Junior Joel Ferreira [UNESP]. "Avaliação da influência de diferentes materiais oclusais na confecção de próteses fixas implantossuportadas unitárias com diferentes diâmetros dos implantes osseointegrados: estudo pelo método dos elementos finitos tridimensionais." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/93588.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:26:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-08-25Bitstream added on 2014-06-13T19:34:21Z : No. of bitstreams: 1 santiagojunior_jf_me_araca.pdf: 4599975 bytes, checksum: efdcd7bb205ee8146a6d5463f80ff100 (MD5)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A literatura científica ainda é escassa em relação à influência de diferentes materiais na confecção de próteses fixas implantossuportadas unitárias em relação aos diferentes diâmetros dos implantes osseointegrados na distribuição das tensões; as suas manifestações e repercussões na prática clínica ainda não estão totalmente esclarecidas, sendo a fundamentação científica indispensável. Assim, o objetivo desta dissertação foi avaliar a influência do material de revestimento oclusal na confecção de prótese fixa implantossuportada unitária com diferentes diâmetros de implantes osseointegrados. Para o estudo foram elaborados 08 modelos, representando cada qual uma secção de osso mandibular (osso esponjoso e cortical), com a presença apenas de um implante (Conexão Master Screw, Sistemas de Próteses, São Paulo, Brasil) do tipo hexágono externo de 3.75 mm x 10 mm (4 modelos) e de 5.00 mm x 10 mm (4 modelos) com coroas de porcelana feldspática, ou de resina acrílica, ou de resina composta ou coroa liga de NiCr. Para confecção dos modelos foram utilizados os programas de desenho assistido: Rhinoceros® 3D 4.0 (NURBS Modeling for Windows, EUA) e SolidWorks® 2006 (SolidWorks Corp, Massachusetts, USA). Os desenhos tridimensionais foram exportados para o programa de elementos finitos NEI Nastran® 9.0 (Noran Engineering, Inc, EUA), para geração da malha, aplicação da carga e análise. Os resultados foram visualizados através dos mapas de tensão von Mises de cada modelo proposto, a fim de avaliar as variações individuais da distribuição das tensões no implante e na coroa; no osso os resultados foram visualizados através dos mapas de tensão máxima principal. Na carga axial (200 N), o osso cortical não mostrou grandes diferenças entre todos os modelos e o osso trabecular sofreu um aumento das tensões por tração...
The scientific literature is still scarce about the influence of different veneering materials used in fabricating superstructures for implant-retained fixed prostheses in relation to different implant diameters on stress distribution, and the manifestations and implications in clinical practice were not clarified. The aim of this dissertation was to evaluate the influence of occlusal material for single implant-supported fixed prostheses with different implant diameters. For this study were simulated 8 models, representing a section of the mandibular bone (trabecular and cortical bone) with a single external hexagonal implant (Master Screw, Conexão Sistema de Prótese ltda., Sao Paulo, Brazil) of 3.75 x 10 mm (4 models) and 5.00 mm x10 mm (4 models) with a crown with different occlusal materials: feldspathic porcelain crowns, or acrylic resin or composite resin crown or NiCr alloy. The models were designed using computer-aided design softwares : Rhinoceros® 3D 4.0 (NURBS Modeling for Windows, USA) and SolidWorks® 2006 (SolidWorks Corp., Massachusetts, USA). The three-dimensional designs were exported to the finite element program NEI Nastran® 9.0 (Noran Engineering, Inc, USA) for mesh generation, load application and analysis. The results were visualized through von Mises stress maps of each model, to assess individual variations of the stress distribution on the implant and crown; bone results were visualized through maps of maximum principal stress. In axial loading (200 N), cortical bone showed no significant differences in all models,on the trabecular bone the tensile stress increased, with regular implant diameter. For non-axial loads (100 N), the cortical bone, the tensile stress increased significantly on the side common the load application, when it reduced the implant diameter; in the trabecular bone showed seemed stress patterns, although more... (Complete abstract click electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
6

Bacchi, Ataís 1986. "Influência do material de infraestrutura e do desajuste vertical de próteses parciais fixas implantossuportadas nas tensões transmitidas às estruturas protéticas e ao tecido ósseo peri-implantar." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288548.

Full text
Abstract:
Orientador: Rafael Leonardo Xediek Consani
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-19T19:18:16Z (GMT). No. of bitstreams: 1 Bacchi_Atais_M.pdf: 865962 bytes, checksum: 55e25bc8a48c9b1870a41c704082365a (MD5) Previous issue date: 2012
Resumo: O objetivo neste estudo foi avaliar a influência do material de infraestrutura e diferentes níves de desajuste vertical na concentração de tensões em prótese parcial fixa implantossuportada (infraestrutura e porcelana de cobertura), parafuso de retenção e tecido ósseo peri-implantar durante o assentamento protético e frente à aplicação de carga oclusal. Um modelo tridimensional de elementos finitos de uma porção posterior de mandíbula contendo dois implantes osseointegrados nas posições de segundo pré-molar e segundo molar, suportando uma prótese parcial fixa foi construído utilizando software específico de modelagem (SolidWorks 2010). Modelos de elementos finitos foram obtidos pela importação do modelo sólido ao software de simulação mecânica (ANSYS Workbench 11). Os modelos foram separados em grupos de acordo com o material de infraestrutura (liga de ouro tipo IV, liga de prata-paládio, titânio comercialmente puro, liga de cobalto-cromo ou zircônia) e o nível de desajuste vertical (10 ?m, 50 ?m e 100 ?m) criado na interface prótese-implante do segundo pré-molar. A concentração de tensões foi avaliada nas seguintes condições: (1) assentamento protético; e (2) cargas oclusais simultâneas de 110 N vertical e 15 N horizontal em cada dente. Os resultados obtidos mostraram que as infraestruturas mais rígidas apresentam maior concentração de tensões internas; entretanto, promoveram menores concentrações de tensão sobre a porcelana de recobrimento, em ambas condições avaliadas. Na análise do assentamento protético, materiais mais rígidos para infraestruturas aumentaram os valores de tensão no parafuso de retenção e não causaram diferença relevante nas tensões no tecido ósseo peri-implantar. Quando a carga foi aplicada, o uso de infraestruturas mais rígidas promoveu redução de tensões no parafuso de retenção e no tecido ósseo peri-implantar. Em ambas condições avaliadas um considerável aumento na concentração de tensões foi obsevado em todas as estruturas com a amplificação do desajuste. Nas diferentes simulações, o material de infraestrutura exerceu considerável influência nas tensões transmitidas às estruturas avaliadas, exceto ao tecido ósseo peri-implantar em condições de assentamento. Aumento de tensões em todas as estruturas pode ser observado com o aumento do desajuste
Abstract: The aim in this study was to evaluate the influence of the framework material and vertical misfit on the stresses created in an implant-supported partial prosthesis (framework and porcelain veneer), retention screw and peri-implant bone tissue during the settlement of the prosthesis and under load conditions. A 3-D Finite Element model of a posterior part of a jaw with two osseointegrated implants at the place of the right second pre-molar and second molar supporting an implant-supported fixed partial prosthesis was constructed using specific modeling software (SolidWorks 2010). Finite element models were obtained by importing the solid model into mechanical simulation software (ANSYS Workbench 11). The models were divided into groups according to the framework material (type IV gold alloy, silver-palladium alloy, commercially pure titanium, cobalt-chromium alloy or zirconia) and vertical misfit level (10 ?m, 50 ?m and 100 ?m) created at the second pre-molar implant-prosthesis interface. The stress concentration was evaluated in the following conditions: (1) settlement of the prosthesis; and (2) simultaneous loads of 110 N vertical and 15 N horizontal in each tooth. The obtained results showed that stiffer frameworks presented higher stress concentrations in it and led to lower stresses in the porcelain veneer, in both conditions. In the analysis of settlement of the prosthesis, stiffer framework materials increased the stress values in the retention screw and did not cause a relevant difference in the stresses values in peri-implant bone tissue. When the load was applied, the use of more stiffness frameworks led to lower stresses in the retention screw, and peri-implant bone tissue. In both conditions evaluated, considerable raise of stress concentration was observed in all the structures within misfit amplification. Comparing the results of the different simulations, the framework materials presented a considerable influence on the stress concentration in the structures evaluated, except on the peri-implant bone tissue during the settlement of the prosthesis, while a considerable increase of the stress in all the structures was observed with the increase of the misfit
Mestrado
Protese Dental
Mestre em Clínica Odontológica
APA, Harvard, Vancouver, ISO, and other styles
7

Ayub, Karen Vaz. "Avaliação clínica e radiográfica de implantes utilizados como pilares de próteses inferiores implantossuportadas do tipo protocolo, colocadas sob carga imediata, empregando dois sistemas reabilitadores após 7 anos." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-03122013-164207/.

Full text
Abstract:
Esta pesquisa avaliou o sucesso de implantes utilizados como pilares de próteses inferiores implantossuportada do tipo protocolo, empregando dois sistemas reabilitadores, sob carga imediata, após 7 anos. Foram pesquisados os seguintes aspectos: índices de placa e de sangramento, estabilidade dos implantes por frequência de ressonância (FR) e perda óssea marginal. Foram avaliados 76 implantes, em 19 pacientes, divididos em 2 grupos: A (n=12, All-on-four® - Nobel Biocare®) e B (n=7, Neopronto® - Neodent®). Os pacientes foram acompanhados nos momento da instalação dos implantes (inicial), 6 meses, 1, 2 e 7 anos após a instalação. Os resultados mostraram uma taxa de sucesso de 100% para os implantes do grupo A e de 90% para o grupo B. Os índices de placa não apresentaram diferenças estatisticamente significativas e foram, no grupo A, de 71,87%, 63,54% e 47,92%, e, no grupo B de 26,78%, 41,07% e 37,50%, para as avaliações de 1, 2 e 7 anos, respectivamente. O índice de sangramento para o grupo A foi de 43,75%, 42,71% e 43,75% e para o grupo B foi de 53,57%, 51,79% e 48,21%, nos tempos de avaliação de 1, 2 e 7 anos, respectivamente, sem diferenças estatísticas. Não foi observado supuração em nenhum tempo de avaliação. Os resultados de FR não diferiram estatísticamente entre os dois grupos, entretanto, diminuíram entre a avaliação inical (grupo A = 69,27ISQ e grupo B = 68,29ISQ) e de 6 meses (grupo A = 64,65ISQ e grupo B = 66,50ISQ), e aumentaram nos anos seguintes para os 2 grupos, sendo para o grupo A de 66,17ISQ, 66,05ISQ e 69,87ISQ e para o grupo B de 67,78ISQ, 68,13ISQ e 73,61ISQ para os tempos de 1, 2 e 7 anos, respectivamente. Em relação a perda óssea, existiu diferença significativa entre grupos e foi de 0,49mm e 0,67mm após 1 ano e de 1,03mm e 1,27mm, após 7 anos, para os grupos A e B, respectivamente. Em relação à posição dos implantes, o grupo B apresentou diferença estatística entre os implantes centrais e distais nas avaliações de FR e perda óssea. Concluiu-se que 1- a taxa de sucesso foi de 100% para o grupo A e de 90% para o grupo B; 2- os índices de placa e de sangramento diminuíram ao longo dos anos de avaliação; 3- a FR foi semelhante entre os grupos, mas com diferença significativa no grupo A para o critério tempo e, no grupo B para os critérios tempos de avaliação e posição dos implantes; 4- perda da altura da crista óssea foi diferente significativamente entre os grupos, sendo maior no grupo B.
This study evaluated the success of implants used to support mandibular complete full-arch fixed prosthesis employing two rehabilitation systems with immediate loading after 7 years. The following aspects were investigated: plaque and bleeding index, implant stability by resonance frequency analysis and marginal bone loss. The 76 implants were evaluated in 19 patients divided in 2 groups: A (n=12, All-on-four® - Nobel Biocare®) and B (n=7, Neopronto® - Neodent®). The follow-up visits were at the time of implant placement (initial), 6 months, 1, 2 and 7 years after surgery. The results showed a success rate of 100% for implants in group A and 90% for group B. The plaque index did not differ statistically signifcant and were in group A, 71.87%, 63.54% and 47.92%, and in group B 26.78%, 41.07% and 37, 50% for 1, 2 and 7 years of follow-up, respectively. The bleeding index for group A was 43.75%, 42.71% and 43.75% and for group B was 53.57%, 51.79% and 48.21%, for 1, 2 and 7 years of follow-up, respectively, no statistical differences. Suppuration was not observed at any time of evaluation. The results of FR did not differ significantly between groups, however, decreased between initial (group A = 69,27ISQ and group B = 68,29 ISQ) and 6 months (group A = 64,65ISQ and group B = 66,50ISQ), and increased in the following evaluations for both groups, in group A was 66,17ISQ, 66,05ISQ and 69,87ISQ and group B was 67,78ISQ, 68,13ISQ and 73,61ISQ for 1, 2 and 7 years of follow-up, respectively. In relation to bone loss, a significant difference existed between groups and was 0,49mm and 0,67 mm after 1 year and 1,03mm and 1,27mm after 7 years, for groups A and B, respectively. Regarding the position of the implants, group B showed statistical difference between the central and distal implants for FR and bone loss. It was concluded that 1- Success rate was 100% for group A and 90% for group B; 2 - Plaque and bleeding index decreased over the follow-up; 3- FR was similar between groups, but with a significant difference in group A for thw criterion time, and in group B for the criteria evaluation times and position of the implants, 4- bone loss was significantly different between groups, and higher in group B.
APA, Harvard, Vancouver, ISO, and other styles
8

Antenucci, Rosse Mary Falcón [UNESP]. "Análise das tensões em próteses unitárias implantossuportadas com diferentes tipos de conexões e qualidade óssea: estudo pelo método dos elementos finitos tridimensionais." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/105562.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:35:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-09-02Bitstream added on 2014-06-13T19:24:18Z : No. of bitstreams: 1 antenucci_rmf_dr_araca.pdf: 994627 bytes, checksum: 0fe6227d507931e16135dd308b4ca65c (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Um aspecto crítico que afeta o sucesso ou falha de um implante é a maneira pela qual as tensões são transferidas do implante ao tecido ósseo. A sobrecarga na prótese dentária pode levar a perda da osseointegração, dessa forma, é aconselhável evitar altas concentrações de tensões no osso de suporte, do ponto de vista clínico. Entretanto, o estresse mecânico pode ter consequências positivas ou negativas no tecido ósseo, fatores esses dependentes de vários fatores associados que podem ser mecânicos ou biológicos. Portanto, o propósito do presente estudo foi analisar a influência da qualidade óssea na distribuição das tensões em próteses unitárias implantossuportadas com diferentes tipos de conexão protética, pelo método dos elementos finitos tridimensionais. Para isso, foram confeccionados doze modelos tridimensionais com o auxílio dos programas de modelagem gráfica SolidWorks 2010 e Rhinoceros 4.0, além do programa InVesalius. Cada modelo foi composto por um bloco com diferentes qualidades ósseas (Tipo I, II, III e IV) e a presença de um implante (4,0x10 mm) com diferente tipo de conexão (Hexágono externo, interno e cone Morse), com coroa metalo-cerâmica. Após geração de geometrias, os modelos foram importados para o programa de pré e pós processamento de elementos finitos FEMAP 10.2, onde foram geradas as malhas de elementos finitos, condições de carregamento e contorno. A carga aplicada foi de 200N axialmente e 100N obliquamente, na superfície oclusal das coroas. Essa carga total foi dividida entre as cúspides (4 para a carga axial e as duas linguais para a carga oblíqua). Em seguida, a análise foi gerada no programa FEMAP 10.2 e exportada para cálculo no programa de elementos finitos...
A critical issue that affects the success or failure of an implant is the manner in which the stresses are transferred from the implant to bone tissue. The overload can lead the dental implant to loss of osseointegration, thus it is advisable to avoid high stress concentrations in bone support, according to the clinical point of view. However, mechanical stress can bring positive or negative consequences in the bone tissue and these factors depend on association with mechanical or biological factors. Therefore, the purpose of this study was to analyze the influence of bone quality on stress distribution in implant-prosthesis unit with different types of prosthetic connection, by the three-dimensional finite element method. For this, twelve three-dimensional models were made with the aid of SolidWorks 2010 and Rhinoceros 4.0, graphical modeling software, besides the InVesalius. Each model was composed of a block with different bone qualities (Type I, II, III and IV), an implant (4.0 x 10 mm) with different type of prosthetic connection (Hexagon external, internal and Morse taper) and metal ceramic crown. After generation of geometries, the models were imported into FEMAP 10.2, the pre and post-processing finite element software, where it was generated finite element meshes, boundary and loading conditions. The 200N load was applied axially and 100N obliquely on the occlusal surface of crowns. This total load was divided among the cusps (four points for the axial load and two points for the oblique load on the lingual cusps). Then, the analysis was generated in the FEMAP 10.2 and exported to the NeiNastran version 9.2 software for calculation in finite element analysis, running on a workstation. The results were imported back to the FEMAP 10.2 for viewing and post-processing maps of von Mises stress and... (Complete abstract click electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
9

Soo, Steven. "The superplastic forming of dental implant superstructures." Thesis, King's College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406935.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Al-Noaman, Ahmed. "Novel bioactive glass coating for dental implant." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3342.

Full text
Abstract:
With an increasingly ageing population the requirement for titanium implants will grow. A major challenge is to speed up the rate and strength of osseo-integration. Bioactive glass coated titanium is postulated to improve bone-bonding ability of titanium. However, bioactive glasses have a higher thermal expansion coefficient (TEC) than titanium and are more prone to crystallization during coating process. Therefore, the aim was to develop a bioactive glass coating that matches the TEC of titanium does not crystallize during coating process and forms surface apatite in vivo and in vitro. To achieve these qualities certain compounds (MgO, CaF2 and MgF2 and fluorapatite (FA) crystals) were substituted or added to the glass composition. The glasses were prepared using melt-derived route. The ground glasses were sieved to obtain less than 45 μm diameter glass particles and this powder characterised using X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). Glass rods were cast to measure TEC, glass transition temperature (Tg) and softening temperature (Ts) using Dilatometry. Glass structure was investigated by measuring glass density and oxygen density. The apatite-forming ability of the glass powder was assessed in both Tris-buffer and simulated body fluid (SBF). Filtrates were analysed by inductively coupled plasma spectroscopy (ICP). Titanium disks were coated with bioactive glass/composites using the enamelling technique. Coated samples were characterised by (XRD, FTIR) and scanning electron microscopy (SEM-EDS). Bioactivity of coating samples was studied after 1 month immersion in Tris-buffer solution or SBF. Biocompatibility assays of glass coatings were assessed using UMR106 osteoblast-like cells and a fibroblast cell line. The results generated some interesting findings – firstly it is possible to produce glasses with comparable TEC of titanium and wide sintering windows. Although most preparations were more bioactive compared with those of Saiz and Tomsia–not all preparations were bioactive. Some coatings were biocompatible with fibroblasts, but not osteoblast-like cells. Whilst some glasses might not be suitable for a coating, they may have use as structural scaffolds for skeletal reconstruction.
APA, Harvard, Vancouver, ISO, and other styles
11

Santini, Michele <1993&gt. "A Novel Approach for Dental Implant Technology." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/16995.

Full text
Abstract:
Al giorno d’oggi la zirconia è un materiale molto utilizzato nelle applicazioni mediche in particolare nel campo della implantologia dentale grazie alle sue proprietà di biocompatibilità, resistenza a frattura e resistenza alla degradazione. In questo contesto si è riscontrato un problema sempre più frequente, l’utilizzo di superfici rugose che velocizzano l’osteointegrazione dell’impianto dentale ma allo stesso tempo aumentano la possibilità di perimplantiti ovvero dell’adesione di batteri sulla superficie. Date queste premesse abbiamo cercato un’alternativa che riducesse il problema sopra esposto tramite l’utilizzo di un materiale ceramico attivo: il nitruro di silicio. Nello specifico, si è valutata l’idea di un coating alla zirconia mantenendone così le sue proprietà caratteristiche ma riducendo il problema grazie alla bioattività del nitruro di silicio. Sono stati introdotti in primo luogo i concetti quali materiali ceramici avanzati, biomateriale e fornita un’analisi delle proprietà di Si3N4 e ZrO2; è stato poi introdotto il concetto di tessuto osseo per dare una visione dettagliata sul processo di osteointegrazione cellulare e definita l’azione dei batteri su protesi dentali. All’interno del paper vengono descritti i batteri stafilococco epidermidi e le linee cellulari osteosarcoma SaOS-2 che sono stati utilizzati per questo lavoro. I diversi campioni di zirconia e zirconia coated nitruro di silicio sono stati testati in ambienti biologici utilizzando linee cellulari: osteosarcoma (SaOS-2). Dapprima è stata fatta la caratterizzazione di ceramiche ZrO2 trattate in superficie e rivestite con diversi strati di Si(3+x)N(4-y) non stechiometrico per indurre un effetto antibatterico e stimolare la proliferazione cellulare. Si sono studiate quattro tipologie di substrati: zirconia polished; zirconia rough; zirconia coated di nitruro di silicio e nitruro di silicio come positive control. Per valutare la morfologia e proprietà superficiali, i campioni sono stati pre-caratterizzati con tecniche spettroscopiche e microscopiche quali: Laser microscopie, Raman, FT-IR, XPS e SEM. I risultati hanno mostrato una scarsa concentrazione di nitruro di silicio nel coating con zirconia. Successivamente i campioni sono stati caratterizzati utilizzando test in vivo con vari marcatori biologici e batterici e tecniche di imaging. La spettroscopia Raman, il microscopio a fluorescenza e SEM sono stati gli strumenti che hanno consentito la caratterizzazione dell’efficacia antibatterica, ovvero l’adesione di batteri sulla superficie dei campioni e il processo di osteointegrazione, ovvero la formazione e la crescita di idrossiapatite (HA). I risultati hanno evidenziato una scarsa attività antibatterica per tutti i campioni, caratteristica prevedibile nella zirconia la quale non presenta per natura attività antibatterica, un altro discorso va invece fatto per il coating di nitruro di silicio che presenta questa caratteristica per una scarsa concentrazione di nitruro sulla superficie. Successivamente si è evidenziata la presenza di composti biologici e HA in diverse quantità in tutti i campioni confermando le buone proprietà di biocompatibilità e osteointegrazione di nitruro di silicio e zirconia. Il campione di coating di nitruro di silicio ha invece dimostrato la migliore osteointegrazione, Data la bassa attività di nitruro di silicio emersa al termine dell’esperimento, si è compreso che è possibile migliorare la superficie delle protesi dentarie attraverso un coating sulla zirconia dal punto di vista antibatterico e osteointegrativo.
APA, Harvard, Vancouver, ISO, and other styles
12

Silva, Miguel Tiago dos Santos Marinho da. "Estudo in vitro do interface implante-pilar de estruturas para sobredentaduras, por microscopia ótica, com diferentes tipos de implantes." Master's thesis, [s.n.], 2014. http://hdl.handle.net/10284/4367.

Full text
Abstract:
Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária
A perda de um ou mais dentes pode envolver, para além de um problema funcional, um problema psicológico associado ao comprometimento estético. A implantologia proporcionou novas alternativas de reabilitação. Atualmente existem inúmeros formatos e diâmetros de implantes e respetivos componentes. Muitos são os fatores que podem favorecer o desenvolvimento de doenças peri-implantares. Os implantes dentários não são totalmente cobertos; parte deles ficam expostos, sendo facilmente colonizados pelas bactérias. Essa colonização pode originar doenças peri-implantares, e posteriormente perda do implante. A possibilidade de contaminação do implante é grande, ainda mais quando se sabe que a união entre implante e intermediário não é perfeita. Tal falha pode acarretar a infiltração de fluidos e bactérias para o interior do implante, favorecendo as alterações clinicas e microbiológicas dos tecidos gengivais e do osso adjacente. Até ao momento, a infiltração bacteriana na união entre o implante e o pilar é inevitável. Neste seguimento surge este trabalho, cujo objetivo principal consistiu na análise por microscopia ótica de várias marcas e formas de implantes e os seus intermediários, de modo a poder inferir se existem diferenças significativas entre eles. Para a realização deste estudo foi efetuada uma vasta pesquisa bibliográfica baseada em livros e em repositórios científicos como a Pubmed e Science Direct, tendo sido selecionados artigos publicados nos últimos 25 anos. As palavras-chave utilizadas foram “dental implant bars fit”, “gap junction dental implant”, “microleakeage implant”, “Implant Microgap”, “leakage dental implant”, “microbial leakage dental implant”, Com base na literatura encontrada foi idealizado um protoloco que pretendeu avaliar a distância média entre o implante e o pilar nas suas diferentes formas de conexão existentes. Como principais conclusões deste estudo pode afirmar-se que não existem diferenças estatisticamente significativas entre as duas formas de conexão estudadas e as duas formas de pilar incorporadas no estudo. The loss of one or more teeth can create, besides from a functional issue, a psychological issue associated with loss of aesthetics. Implantology has provided new alternatives of oral rehabilitation. At present there are several forms and sizes of implants available and their correspondent components. There are a lot of factors that can lead to the development of peri-implant diseases. Dental implants are not fully coated; parts of them are exposed, facilitating the bacterial colonization. This colonization can therefore originate peri-implant diseases, and with time, the implant loss. The possible contamination of the implant is high, even more when it is known that the junction between implants and their intermediate is not perfect. Such junction can lead to the infiltration of fluids and bacteria to the implant interior, facilitating the clinic and microbiologic alterations of the gums and the surrounding bone. Until now, the bacteriological infiltration in the junction between the implant and the abutment is unavoidable. In this context, this work was performed with the main goal of analysing, by optic microscopy, several brands and shapes of implants and their intermediaries, to be able to discern if there are any significant differences between them. In order to carry out this study, a wide bibliographic search based on scientific books and repositories like Pubmed and Science Direct was performed, analysing scientific articles in this topic which have been published in the last 25 years. The key words used were “dental implant bars fit”, “gap junction dental implant”, “microleakage implant”, “Implant Microgap”, “leakage dental implant”, “microbial leakage dental implant”. Based on the literature found, a protocol was idealized to evaluate the average distance between the implant and the abutment, in the different ways of connection that exist. As the main conclusion of this study, it can be said that there are no statistical significant differences between the two forms of connections studied, and the two forms of abutments incorporated in this study.
APA, Harvard, Vancouver, ISO, and other styles
13

Aguiar, Juliana Ribeiro Pala Jorge de [UNESP]. "Influência do tipo de conexão pilar/implante na manutenção da pré-carga de parafusos de retenção e na desadaptação vertical da coroa protética antes e após ciclagem mecânica." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/105561.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:35:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-05-02Bitstream added on 2014-06-13T19:24:17Z : No. of bitstreams: 1 aguiar_jrpj_dr_araca.pdf: 843042 bytes, checksum: f640ef7de226d005134afbe1456c4ddf (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Próteses implantossuportadas estão sujeitas a diversos tipos de falhas, sendo o afrouxamento do parafuso de retenção a complicação mais frequente, devido à perda da pré-carga inicial. A perda da pré-carga pode ser influenciada por fatores como incidência de cargas oclusais impróprias, diferentes tipos de conexões do sistema implante/prótese e desajustes entre a coroa e o implante. Sendo assim, este estudo teve como objetivo avaliar a manutenção da pré-carga de parafusos de retenção de titânio e a desadaptação vertical de coroas protéticas parafusadas, antes e após a ciclagem mecânica. Para isso, três tipos de conexões implante/pilar foram utilizados: implantes de conexão interna híbrida com pilar do tipo esteticone (grupo CIE); implantes de conexão externa com pilar o tipo esteticone (grupo CEE); e implantes de conexão externa com pilar UCLA (grupo CEU). Para cada grupo, foram confeccionadas 10 coroas metálicas fundidas em liga de CoCrMo para a composição final dos corpos-de-prova. Os parafusos de retenção protéticos receberam torque de 20N.cm nos grupos CIE e CEE e 30N.cm no grupo CEU, e, após três minutos, foi mensurado o valor de destorque inicial, com o auxílio de um torquímetro analógico. Após essa avaliação inicial, as coroas receberam novamente o torque recomendado e foram submetidas ao ensaio de ciclagem mecânica, com carga oblíqua (30°) de 130N ± 10N, a 2Hz de freqüência, totalizando 1x106 ciclos. Após a ciclagem, foi mensurado o destorque final. Além disso, antes e depois da ciclagem mecânica, foi realizada a verificação da adaptação vertical das coroas por meio de um estereomicroscópio, com as coroas parafusadas a um único implante e posicionadas em uma matriz de silicone...
Implant-supported prostheses are prone to several types of fail, and the retaining screw loosening is the most frequent complication, due to the loss of its initial preload. Loss of preload may be caused by different factors such as the incidence of excessive occlusal loading, different types of implant/prosthesis connections systems and vertical misfit between crown and implant. Thus, the aim of this study was to evaluate the preload maintenance of titanium retaining screws and to measure the vertical misfit of implant-supported screwed crowns, before and after mechanical cycling. For this purpose, three types of implant/abutment systems were embedded in polyester resin: internal hybrid connection implants and Estheticone abutments (Group ICE); external connection implants with Estheticone abutments (Group ECE); and external connection implants with UCLA abutments (Group ECU). For each group, 10 metallic crowns were cast in CoCrMo alloy for the final compositions of the specimens. Retaining screws received insertion torque of 20 N.cm in groups ICE and ECE and 30N.cm in group ECU, and, after three minutes, the initial detorque was measured through an analogical torquemeter. After this initial evaluation, crowns were retightened and submitted to cyclic loading test, with an oblique loading (30°) of 130N ± 10N, at 2Hz of frequency, totalizing 1x106 cycles. After cycling, final detorque was measured. Moreover, before and after mechanical cycling, the vertical misfit of the crowns was measured through estereomicroscopy, with the crowns screwed to a single implant and positioned into a silicone matrix. The data obtained were tabulated and submitted to variance analysis, Fisher’s exact test and Pearson’s linear... (Complete abstract click electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
14

Moretti, Lívia Alves Corrêa. "Microtopografia de implantes de titânio com diferentes tratamentos de superfícies à microscopia eletrônica de varredura e de força atômica." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/58/58132/tde-18092012-160925/.

Full text
Abstract:
INTRODUÇÃO: A qualidade da interface osso-implante pode ser influenciada diretamente pela rugosidade da superfície e determina a forma como as células interagem, aderem-se e fixam-se a ela, podendo potencializar e encurtar o tempo de osseointegração. Este estudo propôs-se analisar qualitativamente a topografia e arquitetura de diferentes superfícies de implantes dentários, compará-las, descrevê-las e correlacioná-las com os possíveis eventos moleculares e celulares iniciais da osseointegração. MATERIAIS E MÉTODOS: cinco implantes com diferentes tratamentos de superfície foram analisados em três diferentes áreas: apical, região de roscas (topos, flancos e vales) e região cervical por microscopia eletrônica de varredura (MEV) e topo do ápice em microscopia de força atômica (MFA). RESULTADOS: as superfícies dos implantes NanoTite®, SLA® e Xive® TG plus, no MEV, são semelhantes pelo seu aspecto de lacunas, diferindo no plano superficial; a superfície do implantes TiUnite® apresenta características coraliformes/vulcanoides, enquanto a do implante Exopro® apresenta estrias em formas de pequenos sulcos. A rugosidade média (Ra) à MFA, apresentou-se maior no implante TiUnite®, seguido pelos implantes Xive®TG plus, NanoTite®, Exopro® e SLA®. A área analisada se restringe a pequenos pontos (nanométricos), que não possibilita uma visão panorâmica de todas as estruturas (micrométricas), e consequentemente não permite uma real comparação da rugosidade. CONCLUSÕES: a metodologia ideal para análise das superfícies com o objetivo de compreender como as células às colonizam e se aderem deve ser em escala micrométrica, destacando-se à MEV em detrimento da MFA. As duas metodologias, MEV e MFA, são fundamentais na análise de superfície de implantes dentários, porém devem ser conjuntamente e/ou simultaneamente empregadas. A MFA parece ser a mais adequada para estudos que visem a interação da superfície dos implantes com estrutura de nível molecular e à MEV, no nível celular. Cada tratamento de superfície promove um tipo específico de topografia, cujos benefícios moleculares, teciduais e clínicos devem ser estudados caso a caso.
Introduction: Bone-implant interface quality may be influenced by surface roughness and determines how cells interact, cling to and fix to, therefore can enhance and shorten the time for osseointegration. This study aims to analyze qualitatively the topography and architecture of different dental implants surfaces, to compare and describe them. MATERIALS AND METHODS: five implants with different surface treatments were evaluated in three different areas: apical, region of threads (tops, sides and valleys) and cervical region by scanning electron microscopy (SEM) and atomic force microscopy (AFM), correlating the possible molecular and cellular initials events of osseointegration. RESULTS: the surfaces of the implants NanoTite®, SLA® and ® Xive® TG plus, in the SEM, are similar by their appearance of gaps, although they differ in surface plane; the surface of TiUnite® implants have features such as corals and/or volcanos, while the implant Exopro ® has stretch marks in form of small grooves. The average roughness (Ra) to the AFM, appeared higher in TiUnite ® implant, followed by Xive® TG plus NanoTite®, Exopro® and SLA® implants. The area analyzed in the AFM, is restricted to small points (nanometrics), and do not allow denote a panoramic view of all structures (micrometrics), not allowing a real comparison of surface roughness. CONCLUSIONS: the optimal methodology for surfaces analysis with the objective of understanding how the cells colonize and fix to dental implants should be in the micrometer scale, highlighting the SEM over AFM. The AFM seems to be most suitable for studies aiming the interaction of the implant surface with molecular-level and SEM at the cellular level. Each treatment promotes a specific surface topography whose benefits molecular, tissue, and clinical should be studied separately.
APA, Harvard, Vancouver, ISO, and other styles
15

Morgan, M. Jane. "Structural analysis of an osseointegrated dental implant system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28023.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Pimentel, Gustavo Henrique Diniz [UNESP]. "Análise in vitro da precisão de técnicas de esplintagem na moldagem de implantes no esquema all-on-four." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/145513.

Full text
Abstract:
Made available in DSpace on 2016-12-09T13:52:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-10-15. Added 1 bitstream(s) on 2016-12-09T13:55:26Z : No. of bitstreams: 1 000874738.pdf: 3429941 bytes, checksum: f0746f3294aca82e94682f551d6b7ae5 (MD5)
O assentamento passivo de próteses sobre implantes é fundamental para que o sucesso da reabilitação seja alcançado. A precisão na moldagem de transferência é um dos principais fatores responsáveis por assegurar a adaptação dos componentes. Dentre as várias técnicas propostas, não existe consenso sobre qual é a mais eficaz. O objetivo do presente estudo foi avaliar in vitro a precisão de diferentes métodos de união de transferentes quadrados na moldagem de implantes paralelos e angulados instalados em curva. Para a obtenção do modelo mestre, matrizes metálicas em alumínio foram confeccionadas, apresentando quatro perfurações, em forma de curva, paralelas (prótese protocolo convencional) e anguladas (esquema All-on-four). Foram fixados os análogos e, sobre eles, foram confeccionadas estruturas metálicas. Para os implantes retos, os grupos foram divididos em GSU-R: transferentes quadrados sem união; GUR-R: transferentes quadrados unidos com bastões de resina acrílica autopolimerizável pré-fabricados e GUM-R: transferentes quadrados unidos com haste metálica, cianoacrilato e resina acrílica autopolimerizável. Para os implantes angulados, as mesmas técnicas foram comparadas: GSU-A, GUR-A, GUM-A. A moldagem foi realizada com silicone de adição e moldeira rosqueada para controlar variáveis. Os modelos foram vazados em matriz padronizada com gesso pedra tipo IV. Os modelos obtidos foram armazenados à temperatura ambiente por no mínimo 120 horas até que as medidas das fendas fossem realizadas. Foi utilizada uma lupa LEICA acoplada a uma câmera de vídeo colorida e as mensurações das fendas foram realizadas no programa LEICA QWin. Foi aplicado o teste de Kruskal-Wallis, complementando pelo teste de Dunn, com nível de significância de 5%. Para os implantes retos, foi observada diferença estatisticamente significante entre os grupos...(Resumo completo, clicar acesso eletrônico abaixo)
Passively fitting superstructures are a prerequisite for long-lasting osseointegration of dental implants. Accurate transfer of the implant positions from the mouth to a definitive stone cast is a crucial step for ensuring the adaptation of components. Among the various techniques proposed, there is no consensus on which one is the most effective. The aim of this study was to evaluate in vitro the accuracy of different splinting methods in the impression of implants under standardized laboratory conditions. To obtain the master model, an aluminum metal matrix was developed, presenting four perforations, parallel (simulating conventional prosthesis and angled (simulating All-on-four system). Analogs were fixed and, on them, metal structures were fabricated. For straight implants, the groups were divided into GSUR: non-splinted square transfers; GUR-R: transfers splinted acrylic resin; GUM R: transfers splinted with metal rod, cyanoacrylate and acrylic resin. For angled implants, the same techniques were compared: GSU-A, GUR-A, GUM-A. The impression was performed with polyvinyl siloxane impression material and a standardized tray to control variables. The models were cast in standardized matrix with type IV plaster stone. For the measurements, a software (Leica QWin) received the images from a video camera coupled to a Leica stereomicroscope. The KruskalWallis test, associated with Dunn's test, with significance level of 5%, was applied. For straight implants, statistically significant difference between groups (KruskalWallis test; p <0.001) was observed. The difference was between GUR-R (186.71 µm) and master model (110.40 µm) and between GUR-R and the other groups (GSU-R: 108.27 µm and GUM-R: 92.98 µm). For angled implants, no statistically significant difference (p = 0.492) was found between the groups (MM-A: 68.52 µm; GSU-A: 60.80 µm; GUR-A: 56.54 µm; GUM-A: 69.33 µm. ..(Complete abstract electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
17

Pimentel, Gustavo Henrique Diniz. "Análise in vitro da precisão de técnicas de esplintagem na moldagem de implantes no esquema all-on-four /." Araraquara, 2014. http://hdl.handle.net/11449/145513.

Full text
Abstract:
Orientador: Francisco de Assis Mollo Junior
Banca: Marco Antônio Compagnoni
Banca: Janaína Habib Jorge
Banca: Estevam Augusto Bonfante
Banca: Ricardo Faria Ribeiro
Resumo: O assentamento passivo de próteses sobre implantes é fundamental para que o sucesso da reabilitação seja alcançado. A precisão na moldagem de transferência é um dos principais fatores responsáveis por assegurar a adaptação dos componentes. Dentre as várias técnicas propostas, não existe consenso sobre qual é a mais eficaz. O objetivo do presente estudo foi avaliar "in vitro" a precisão de diferentes métodos de união de transferentes quadrados na moldagem de implantes paralelos e angulados instalados em curva. Para a obtenção do modelo mestre, matrizes metálicas em alumínio foram confeccionadas, apresentando quatro perfurações, em forma de curva, paralelas (prótese protocolo convencional) e anguladas (esquema "All-on-four"). Foram fixados os análogos e, sobre eles, foram confeccionadas estruturas metálicas. Para os implantes retos, os grupos foram divididos em GSU-R: transferentes quadrados sem união; GUR-R: transferentes quadrados unidos com bastões de resina acrílica autopolimerizável pré-fabricados e GUM-R: transferentes quadrados unidos com haste metálica, cianoacrilato e resina acrílica autopolimerizável. Para os implantes angulados, as mesmas técnicas foram comparadas: GSU-A, GUR-A, GUM-A. A moldagem foi realizada com silicone de adição e moldeira rosqueada para controlar variáveis. Os modelos foram vazados em matriz padronizada com gesso pedra tipo IV. Os modelos obtidos foram armazenados à temperatura ambiente por no mínimo 120 horas até que as medidas das fendas fossem realizadas. Foi utilizada uma lupa LEICA acoplada a uma câmera de vídeo colorida e as mensurações das fendas foram realizadas no programa LEICA QWin. Foi aplicado o teste de Kruskal-Wallis, complementando pelo teste de Dunn, com nível de significância de 5%. Para os implantes retos, foi observada diferença estatisticamente significante entre os grupos...(Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Passively fitting superstructures are a prerequisite for long-lasting osseointegration of dental implants. Accurate transfer of the implant positions from the mouth to a definitive stone cast is a crucial step for ensuring the adaptation of components. Among the various techniques proposed, there is no consensus on which one is the most effective. The aim of this study was to evaluate "in vitro" the accuracy of different splinting methods in the impression of implants under standardized laboratory conditions. To obtain the master model, an aluminum metal matrix was developed, presenting four perforations, parallel (simulating conventional prosthesis and angled (simulating "All-on-four" system). Analogs were fixed and, on them, metal structures were fabricated. For straight implants, the groups were divided into GSUR: non-splinted square transfers; GUR-R: transfers splinted acrylic resin; GUM R: transfers splinted with metal rod, cyanoacrylate and acrylic resin. For angled implants, the same techniques were compared: GSU-A, GUR-A, GUM-A. The impression was performed with polyvinyl siloxane impression material and a standardized tray to control variables. The models were cast in standardized matrix with type IV plaster stone. For the measurements, a software (Leica QWin) received the images from a video camera coupled to a Leica stereomicroscope. The KruskalWallis test, associated with Dunn's test, with significance level of 5%, was applied. For straight implants, statistically significant difference between groups (KruskalWallis test; p <0.001) was observed. The difference was between GUR-R (186.71 µm) and master model (110.40 µm) and between GUR-R and the other groups (GSU-R: 108.27 µm and GUM-R: 92.98 µm). For angled implants, no statistically significant difference (p = 0.492) was found between the groups (MM-A: 68.52 µm; GSU-A: 60.80 µm; GUR-A: 56.54 µm; GUM-A: 69.33 µm. ..(Complete abstract electronic access below)
Doutor
APA, Harvard, Vancouver, ISO, and other styles
18

Ma, Matthew P. "The radiographic assessment of dental implant treatments : a pilot study on two-implant supported overdenture cases /." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09DM/09dmm111.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Hirayama, Patrícia Mitiko Asanuma. "Efeito do jateamento com óxido de alumínio e uso de adesivo, no afrouxamento do parafuso de pilares protéticos cônicos, com indexador de restaurações implanto suportadas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23150/tde-04072013-164032/.

Full text
Abstract:
O sucesso dos trabalhos protéticos, executados sobre os implantes osseointegrados, depende da estabilidade da conexão entre implante e pilar protético. Dentre as conexões protéticas existentes, as conexões cônicas têm demonstrado um desempenho melhor, tanto em termos mecânicos, como biológicos. A retenção friccional do pilar cônico é a grande responsável pela resistência aos movimentos laterais e oclusais da mastigação. Com a introdução de indexadores no desenho dessas conexões a característica mecânica mudou, levantando dúvidas em relação a sua atuação. Neste trabalho, avaliou-se o efeito do jateamento e uso do adesivo no torque de desaperto dessas conexões. Vinte e oito pilares synOCta® da marca Straumann® foram avaliados quanto ao torque de aperto inicial de 35 N.cm e torque de desaperto após ciclagem mecânica. Três grupos experimentais foram testados em relação ao grupo controle: modificação da superfície cônica por jateamento com óxido de alumínio, aplicação de adesivo entre as partes e o jateamento mais o adesivo. O grupo jateamento com aplicação do adesivo foi o único que apresentou valores de desaperto superiores quando comparado ao grupo controle. A rugosidade criada pelo jateamento, associada ao adesivo, elevou significantemente os valores de torque de desaperto do parafuso em comparação ao torque de aperto.
The success of the prosthetic work performed over dental implants depends on the stability of the connection between implant and abutment. Among the existing prosthetic connections, the conical connections have shown better performance, both mechanical and biological. The frictional retention of the morse taper is largely responsible for the resistance to lateral and occlusal movements of mastication. With the introduction of indexes in the design of these connections, the mechanical characteristic changed, raising doubts about its performance. In this study, we evaluated the effect of blasting and use of adhesive on abutment screw loosening torque of these connections. Twenty-eight synOcta® pillars Straumann® brand were evaluated for initial tightening torque of 35 N.cm and loosening torque after mechanical cycling. Three experimental groups were tested related to the control group: modification of the conical surface by blasting with aluminum oxide, aplication of adhesive between the parties and blasting added to the adhesive. The group blasted with adhesive application was the only one that showed values of loosening torque higher when compared to control group. The roughness created by blasting associated with the adhesive, significantly elevated values of abutment screw loosening torque against the tightening torque.
APA, Harvard, Vancouver, ISO, and other styles
20

Ghensi, Paolo. "Biological and microbiological properties of dental implants and their relation to peri-implant diseases." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/242588.

Full text
Abstract:
With the increasing use of dental implants in the population, the past three decades have seen a dramatic growth in the prevalence of two new oral diseases: peri-implantitis which affects both soft and hard tissues surrounding the implant, and mucositis which precedes peri-implantitis and involves instead only soft tissues. Mucositis affects 50% to 90% of implants, while almost 20% of implants develop peri-implantitis that can lead over time to implant loss. The underlying hypothesis of this research project is that dental implant properties and their interaction with surrounding soft and hard tissues and oral microbiome play an important role in the maintenance of peri-implant health. Regarding specific characteristics of dental implants, experimental data are in part still lacking on biochemical behavior of implant surfaces and of possible new coatings able to reduce bacterial colonization. From the microbiological viewpoint, based on the lessons learned from the study of periodontal diseases, there are reasons to believe that specific members of the oral microbial communities represent a prerequisite for the development of peri-implant diseases. A thorough profiling of the microbial organisms associated with disease is thus the first step to undertake in order to develop novel prevention and therapeutic strategies. Currently available studies, however, adopted a study design which is not accounting for inter-subject variability, focused on few cultivable microbes only, or used low-resolution microbial profiling. Overall, there are thus several open questions on implant characteristics and microbiologic aspects that need to be addressed for the next generation of implant care. Because these aspects are tightly interconnected, in this thesis I employed an integrated approach to study multiple aspects of biological and microbiological properties of dental implants and their relation to peri-implant diseases. Starting from implant surfaces, we evaluated the biochemical behavior of a specific type of moderately rough surface. We found that, in-vitro, this surface called OGI (Osteo Growth Induction) positively acts on osteogenic and angiogenic commitment of mesenchymal stem cells (MSC). Still in the field of implant surfaces, we developed and tested in-vitro a potential anti-biofilm sericin-based coating obtaining very promising bacterial inhibition values. Finally, we investigated in-vivo through shotgun metagenomics the plaque microbiome associated with peri-implant health and disease unraveling specific microbial and functional signatures associated with these conditions and identifying specific disease-associated microbiome features. In this work we showed that peri-implant diseases are connected with the specific composition of the plaque microbiome and that implant surfaces, in addition to a potential strong bioactive role, if properly treated can significantly reduce microbial adhesion on them. Stressing that maintenance therapy always remains something essential, new scenarios for the future are possible. Besides the need of employing implants with adequate micro- and macro-characteristics, the ever more in-depth knowledge of the peri-implant microbiome will allow to implement increasingly effective anti-biofilm implant surfaces and to introduce microbiome-based protocols of diagnosis, prevention and personalized therapy.
APA, Harvard, Vancouver, ISO, and other styles
21

Ghensi, Paolo. "Biological and microbiological properties of dental implants and their relation to peri-implant diseases." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/242588.

Full text
Abstract:
With the increasing use of dental implants in the population, the past three decades have seen a dramatic growth in the prevalence of two new oral diseases: peri-implantitis which affects both soft and hard tissues surrounding the implant, and mucositis which precedes peri-implantitis and involves instead only soft tissues. Mucositis affects 50% to 90% of implants, while almost 20% of implants develop peri-implantitis that can lead over time to implant loss. The underlying hypothesis of this research project is that dental implant properties and their interaction with surrounding soft and hard tissues and oral microbiome play an important role in the maintenance of peri-implant health. Regarding specific characteristics of dental implants, experimental data are in part still lacking on biochemical behavior of implant surfaces and of possible new coatings able to reduce bacterial colonization. From the microbiological viewpoint, based on the lessons learned from the study of periodontal diseases, there are reasons to believe that specific members of the oral microbial communities represent a prerequisite for the development of peri-implant diseases. A thorough profiling of the microbial organisms associated with disease is thus the first step to undertake in order to develop novel prevention and therapeutic strategies. Currently available studies, however, adopted a study design which is not accounting for inter-subject variability, focused on few cultivable microbes only, or used low-resolution microbial profiling. Overall, there are thus several open questions on implant characteristics and microbiologic aspects that need to be addressed for the next generation of implant care. Because these aspects are tightly interconnected, in this thesis I employed an integrated approach to study multiple aspects of biological and microbiological properties of dental implants and their relation to peri-implant diseases. Starting from implant surfaces, we evaluated the biochemical behavior of a specific type of moderately rough surface. We found that, in-vitro, this surface called OGI (Osteo Growth Induction) positively acts on osteogenic and angiogenic commitment of mesenchymal stem cells (MSC). Still in the field of implant surfaces, we developed and tested in-vitro a potential anti-biofilm sericin-based coating obtaining very promising bacterial inhibition values. Finally, we investigated in-vivo through shotgun metagenomics the plaque microbiome associated with peri-implant health and disease unraveling specific microbial and functional signatures associated with these conditions and identifying specific disease-associated microbiome features. In this work we showed that peri-implant diseases are connected with the specific composition of the plaque microbiome and that implant surfaces, in addition to a potential strong bioactive role, if properly treated can significantly reduce microbial adhesion on them. Stressing that maintenance therapy always remains something essential, new scenarios for the future are possible. Besides the need of employing implants with adequate micro- and macro-characteristics, the ever more in-depth knowledge of the peri-implant microbiome will allow to implement increasingly effective anti-biofilm implant surfaces and to introduce microbiome-based protocols of diagnosis, prevention and personalized therapy.
APA, Harvard, Vancouver, ISO, and other styles
22

Smith, Christopher David. "Prosthodontic maintenance of implant-supported prostheses." Master's thesis, Faculty of Dentistry, 2001. http://hdl.handle.net/2123/4667.

Full text
Abstract:
This work was digitised and made available on open access by the University of Sydney, Faculty of Dentistry and Sydney eScholarship . It may only be used for the purposes of research and study. Where possible, the Faculty will try to notify the author of this work. If you have any inquiries or issues regarding this work being made available please contact the Sydney eScholarship Repository Coordinator - ses@library.usyd.edu.au
APA, Harvard, Vancouver, ISO, and other styles
23

Hjalmarsson, Lars. "On cobalt-chrome frameworks in implant dentistry /." Göteborg : Department of Dentistry/Dental Materials Science, Institute of Odontology, 2009. http://hdl.handle.net/2077/21179.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Patel, Zaheed. "Heat transmission along the surface of dental implant." Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5032_1310989960.

Full text
Abstract:

Objectives: Temperature changes along an implant body have not been widely studied. The objectives of this in vitro study were (i) to establish if the temperature of the abutment influences the temperature of the implant surface, (ii) to establish the temperature transmission from abutment to implant body, and (iii) to establish for what abutment temperature the critical time/temperature threshold of 47oC for 1 minute at implant level is reached.

APA, Harvard, Vancouver, ISO, and other styles
25

Youssef, Sarah Jane. "Implant Maintenance Curriculum Among U.S. Dental Hygiene Programs." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586814568072554.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Basílio, Mariana de Almeida [UNESP]. "Efetividade de parafusos com tratamento de superfície na estabilidade de pilares em zircônia após carga cíclica." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/97312.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:28:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-03-18Bitstream added on 2014-06-13T19:16:53Z : No. of bitstreams: 1 basilio_ma_me_arafo.pdf: 801760 bytes, checksum: 7941402e0f93534f3eda18455ce01460 (MD5)
Com o objetivo de prevenir o afrouxamento, parafusos do pilar com lubrificantes sólidos de superfície foram desenvolvidos e introduzidos no mercado. Assim, foi proposto avaliar a efetividade de parafusos de liga de titânio com e sem tratamento de superfície sobre a estabilidade de pilares em zircônia (ZrO2) após carga cíclica, bem como observar alterações estruturais por meio de microscopia eletrônica de varredura (MEV). Para isso, 20 pilares UCLA em ZrO2 foram fixados sobre implantes do tipo hexágono externo com torque de 20 Ncm e divididos em 2 grupos (n=10), conforme o parafuso do pilar: (A) pilar-implante e parafuso de liga de titânio (Ti); (B) pilar-implante e parafuso de liga de titânio com cobertura Diamond Like Carbon (DLC/Ti). O valor do torque reverso (pré-carga) foi mensurado antes e após o carregamento. O teste foi realizado de acordo com a norma ISO 14801. Cargas cíclicas (0,5 x 106; 15 Hz) entre 11 - 211 N foram aplicadas com 30º de inclinação em relação ao longo eixo dos implantes. As médias dos grupos foram calculadas e comparadas utilizando análise de variância de dois fatores e testes F (α=0,05). Os resultados mostraram que antes do carregamento a média do grupo Ti foi significativamente maior que a do grupo DLC/Ti (p=0,021). Após o carregamento ambas as médias 14 diminuíram significativamente, sem diferença significante entre elas (p=0,499). As imagens obtidas na MEV revelaram micro-fraturas na base de assentamento do pilar. Nas condições estudadas, concluiu-se que: (1) os parafusos estudados apresentaram efetividade similar com relação à manutenção da pré-carga; (2) a redução significativa no torque reverso e os danos observados na MEV indicam que o acompanhamento dos pacientes é necessário para assegurar a longevidade das restaurações de ZrO2 implanto-suportadas.
In an attempt to prevent screw-loosening problem, abutment screws with surface treatment were developed. Thus, the aim of the current study was to evaluate comparatively the effectiveness of titanium alloy coated screws and noncoated screws on the stability of ZrO2-ceramic abutments after cyclic loading, as soon as observe possible microdamaging in the structure of the components using a scanning electron microscope (SEM). For this, 20 prefabricated ZrO2-ceramic UCLA abutments were tightened to 20 Ncm on their respective external hex implants and divided equally into 2 groups (n=10), according to the type of screws used: (A) implant-abutment and noncoated titanium alloy screw (Ti); (B) implant–abutment and titanium alloy screw with Diamond Like Carbon surface coating (DLC/Ti). The reverse torque value (preload) of the abutment screw was measured before and after loading. The tests were performed according to ISO norm 14801. A cyclic loading (0,5 x 106; 15 Hz) between 11 - 211 N was applied at an angle of 30 degrees to the long axis of the implants. Group means were calculated and compared using ANOVA and F tests (α=0,05). The results showed that before cyclic loading, the mean of Ti group was significantly higher than the DLC/Ti group (p=0,021). After cyclic loading, both means decreased significantly, with no significant differences 16 between them (p=0,499). Under the studied conditions, it can be concluded that: (1) the two abutment screw types presented similar effectiveness in maintaining preload; (2) the significant decrease in reverse torque values and the microdamaging detected at SEM analysis indicate that patient follow-up is needed to ensure the integrity of the ZrO2-ceramic single-implant restorations.
APA, Harvard, Vancouver, ISO, and other styles
27

Almeida, Daniel Augusto de Faria [UNESP]. "Avaliação da influência da angulação dos implantes com diferentes tipos de conexão protética na distribuição de tensões: estudo pelo método dos elementos finitos tridimensionais." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/97362.

Full text
Abstract:
Made available in DSpace on 2014-06-11T19:28:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-10-21Bitstream added on 2014-06-13T19:58:21Z : No. of bitstreams: 1 almeida_daf_me_araca.pdf: 686399 bytes, checksum: 50ad249856d1640af8c25dd2dcb4adb5 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O comportamento biomecânico de um implante dentário osseointegrado desempenha um importante papel na sua longevidade funcional. As limitações anatômicas às vezes tornam necessário o posicionamento de implantes com angulações fora do considerado ideal para as reabilitações protéticas, havendo maior concentração de tensões e reabsorção no osso cortical ao redor do implante. Para solucionar tais situações o profissional deve lançar mão de um cuidadoso planejamento e uso de intermediários angulados, estudando qual conexão protética melhor se adapta a situação clínica. Portanto, o propósito do presente estudo foi analisar a influência da angulação dos implantes com diferentes tipos de conexão protética na distribuição de tensões, pelo método dos elementos finitos tridimensionais. Para isso, foram confeccionados seis modelos tridimensionais com o auxílio dos programas de modelagem gráfica SolidWorks 2010 e Rhinoceros 4.0, além do programa InVesalius. Cada modelo foi composto por um bloco ósseo e a presença de um implante (4,0x10 mm) com diferentes angulações (0º, 17º e 30º) e tipos de conexão (Hexágono externo e cone morse), com coroa metalo-cerâmica. Após geração das geometrias, os modelos foram importados para o programa de pré e pós-processamento de elementos finitos FEMAP 10.2, onde foram geradas as malhas de elementos finitos, condições de carregamento e contorno. A carga aplicada foi de 200N axialmente e 100N obliquamente, na superfície oclusal das coroas. Essa carga total foi dividida entre as cúspides (quatro para a carga axial e as duas linguais para a carga oblíqua). Em seguida, a análise foi gerada no programa FEMAP 10.2 e exportada para cálculo no programa de elementos finitos NeiNastran versão 9.2, executada em uma estação de trabalho...
The biomechanical behavior of an osseointegrated dental implant plays an important role in the longevity. The anatomical limitations sometimes require the placement of implants with angles outside the considered ideal for prosthetic rehabilitation, with higher stress concentration and resorption in cortical bone around the implant. Thus, in some situations, the professional should planning careful the treatment and use the abutment, analyzing the prosthetic connection which best fits the clinical situation. Therefore, the purpose of this study was to analyze the influence of the implant angulation with different types of prosthetic connection on the stress distribution, by three-dimensional finite element method. Six three-dimensional models were made with the aid of the graphical modeling and SolidWorks 2010 Rhinoceros 4.0 and InVesalius.Each model was composed of a bone blockwith an implant (4.0 x 10 mm) with different angulations (0, 17 and 30) and connection types (Hexagon external and Morse taper) with metal-ceramic crown. After generation of the geometries, the models were imported into the pre-and post-processing finite element FEMAP 10.2, where we generated finite element meshes, boundary and loading conditions. The load was applied axial 200N and 100N obliquely to the occlusal surface of crowns. This total load was divided between the cusps (four for the axial load and two oblique lingual to the load). Then, the analysis was generated in and exported 10.2 FEMAP software for calculation in finite element program NeiNastran version 9.2, running on a workstation. The results were imported back to the FEMAP 10.2 for viewing and post-processing maps of von Mises stress and maximum principal stress. The maps for... (Complete abstract click electronic access below)
APA, Harvard, Vancouver, ISO, and other styles
28

Tunes, Fábio Sanches Magalhães. "Análise microbiológica da vedação com selante industrial de microgaps nas diferentes conexões implantares: estudo in vitro." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-02102018-171536/.

Full text
Abstract:
A utilização de implantes osseointegráveis e componentes protéticos tornaram-se recursos muito viáveis à resolução de casos simples e complexos na odontologia reabilitadora. No entanto, a junção implante componente pode apresentar problemas, tais como a presença de um microgap entre essas partes constituintes. Assim, vários materiais tem sido testados na tentativa de obstruir esse espaço, com resultados controversos. O objetivo deste estudo foi avaliar in vitro o comportamento de um adesivo anaeróbico (Loctite® 510, Henkel Ltda) monocomponente, de alta resistência e inerte, na vedação do microgap impedindo a passagem bacteriana do meio externo para o interno do conjunto. Foram utilizados 90 implantes de conexão externa hexagonal (n = 30), conexão interna hexagonal (n = 30) e conexão interna cônica (n = 30), divididos em Grupo Controle (n = 45) e Grupo Teste (n = 45). Os implantes foram abertos em fluxo laminar e cada unidade recebeu 3l de BHI estéril internamente. Sobre cada unidade era parafusado um componente protético especifico para cada marca e com torques recomendados pelos fabricantes com torquímetro digital. Os conjuntos Teste receberam ainda uma fina camada de adesivo que era aplicada com microbrush entre as partes; e todas as unidades dos grupos Controle e Teste foram vedados com material obturador provisório na sua porção mais coronal. Cada conjunto foi então imerso em 75 l de Enterococcus faecalis (ATCC 29212) em minitubos até o limite entre a junção implante/componente protético. Todas as amostras foram incubadas em estufa bacteriológica por 7, 14 e 28 dias a 37oC antes de serem reabertas. Após o período proposto, o conteúdo interno dos implantes foi coletado com cones de papel estéreis, diluído e semeado em placas de Petri, incubadas por 48 horas. Houve diferença significante entre o grupo teste e controle no grupo de conexão externa hexagonal, em todos os tempos (Teste de Fischer e Qui-quadrado, p 0.05). O adesivo anaeróbico testado funciona como barreira, não permitindo a migração de bactérias para o meio interno do conjunto implante/componente protético.
The use of dental implants and prosthetic components have become very feasible resources to solve simple and complex cases in rehabilitation dentistry. However, the implant component junction may present problems, such as the presence of a microgap between these components parts.Therefore, several materials have been tested in an attempt to obstruct this space, with controversial results. The objective of this study was to evaluate in vitro the behavior of an anaerobic monocomponent adhesive (Loctite® 510, Henkel Ltda), high resistance and inert characteristics, in the microgap seal preventing bacterial passage from the external side to the inner side of the assembly. A total of 90 implants were used, with hexagonal external connection (n = 30), internal hexagonal connection (n = 30) and internal conical connection (n = 30) divided into Control Group (n = 45). Implants were opened in laminar flow cabinet and each unit received 3l of sterile BHI internally. On each unit a specific prosthetic component was screwed in for each brand and with torques recommended by the manufacturers with digital torque wrench. The sets of Test also received a thin layer of adhesive that was applied with microbrush between the parts; and all units of the Control and Test groups were sealed with provisional obturator material in their most coronal portion. Each set was immersed in 75 l of Enterococcus faecalis (ATCC - 29212) in mini-tubes to the limit between the implant / prosthetic component junction. All samples were incubated in a bacteriological incubator for 7, 14 and 28 days at 37oC before being reopened. After the proposed period, the internal contents of the implants were collected with sterile paper cones, diluted and seeded in Petri dishes, incubated for 48 hours. There was a significant difference between the test and control groups in the hexagonal external connection group at all times (Fischer and Chi-square test, p 0.05). The anaerobic adhesive tested works as a barrier, not allowing the migration of bacteria into the internal environment of the implant / prosthetic component assembly.
APA, Harvard, Vancouver, ISO, and other styles
29

Antenucci, Rosse Mary Falcón. "Análise das tensões em próteses unitárias implantossuportadas com diferentes tipos de conexões e qualidade óssea : estudo pelo método dos elementos finitos tridimensionais /." Araçatuba : [s.n.], 2011. http://hdl.handle.net/11449/105562.

Full text
Abstract:
Orientador: Eduardo Piza Pellizzer
Coorientador: Pedro Yoshito Noritomi
Banca: Paulo Sérgio Perri de Carvalho
Banca: Fellippo Ramos Verri
Banca: Marcelo Ferraz Mesquita
Banca: Pedro Tortamano Neto
Resumo: Um aspecto crítico que afeta o sucesso ou falha de um implante é a maneira pela qual as tensões são transferidas do implante ao tecido ósseo. A sobrecarga na prótese dentária pode levar a perda da osseointegração, dessa forma, é aconselhável evitar altas concentrações de tensões no osso de suporte, do ponto de vista clínico. Entretanto, o estresse mecânico pode ter consequências positivas ou negativas no tecido ósseo, fatores esses dependentes de vários fatores associados que podem ser mecânicos ou biológicos. Portanto, o propósito do presente estudo foi analisar a influência da qualidade óssea na distribuição das tensões em próteses unitárias implantossuportadas com diferentes tipos de conexão protética, pelo método dos elementos finitos tridimensionais. Para isso, foram confeccionados doze modelos tridimensionais com o auxílio dos programas de modelagem gráfica SolidWorks 2010 e Rhinoceros 4.0, além do programa InVesalius. Cada modelo foi composto por um bloco com diferentes qualidades ósseas (Tipo I, II, III e IV) e a presença de um implante (4,0x10 mm) com diferente tipo de conexão (Hexágono externo, interno e cone Morse), com coroa metalo-cerâmica. Após geração de geometrias, os modelos foram importados para o programa de pré e pós processamento de elementos finitos FEMAP 10.2, onde foram geradas as malhas de elementos finitos, condições de carregamento e contorno. A carga aplicada foi de 200N axialmente e 100N obliquamente, na superfície oclusal das coroas. Essa carga total foi dividida entre as cúspides (4 para a carga axial e as duas linguais para a carga oblíqua). Em seguida, a análise foi gerada no programa FEMAP 10.2 e exportada para cálculo no programa de elementos finitos... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: A critical issue that affects the success or failure of an implant is the manner in which the stresses are transferred from the implant to bone tissue. The overload can lead the dental implant to loss of osseointegration, thus it is advisable to avoid high stress concentrations in bone support, according to the clinical point of view. However, mechanical stress can bring positive or negative consequences in the bone tissue and these factors depend on association with mechanical or biological factors. Therefore, the purpose of this study was to analyze the influence of bone quality on stress distribution in implant-prosthesis unit with different types of prosthetic connection, by the three-dimensional finite element method. For this, twelve three-dimensional models were made with the aid of SolidWorks 2010 and Rhinoceros 4.0, graphical modeling software, besides the InVesalius. Each model was composed of a block with different bone qualities (Type I, II, III and IV), an implant (4.0 x 10 mm) with different type of prosthetic connection (Hexagon external, internal and Morse taper) and metal ceramic crown. After generation of geometries, the models were imported into FEMAP 10.2, the pre and post-processing finite element software, where it was generated finite element meshes, boundary and loading conditions. The 200N load was applied axially and 100N obliquely on the occlusal surface of crowns. This total load was divided among the cusps (four points for the axial load and two points for the oblique load on the lingual cusps). Then, the analysis was generated in the FEMAP 10.2 and exported to the NeiNastran version 9.2 software for calculation in finite element analysis, running on a workstation. The results were imported back to the FEMAP 10.2 for viewing and post-processing maps of von Mises stress and... (Complete abstract click electronic access below)
Doutor
APA, Harvard, Vancouver, ISO, and other styles
30

Wanat, Thomas Nelson III. "Risk factors for dental implant failure| Smoking, periodontal disease and previously failed implant sites." Thesis, University of Colorado at Denver, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10130885.

Full text
Abstract:

Background: The literature indicates a reduced survival rate for dental implants placed at previously failed sites, smokers, and patients with a history of periodontal disease. The aim of this study is to review the available literature reporting on the success and/or survival of rough surface implants placed at previously failed sites, in smokers, and in periodontally compromised patients. An attempt was made to systematically review the literature and calculate an overall weighted mean survival rate for rough surface implants in each of the above three scenarios.

Methods: An electronic literature search (MEDLINE-PubMed) was performed and references hand-searched for human studies addressing the success/survival of implants placed at previously failed sites, in smokers and in patients with a history of chronic periodontal disease. The overall weighted mean survival rates and 95% confidence interval were then calculated. Results: Six retrospective studies reporting on implants placed at previously failed sites were included with total of 343 second attempts and 31 third attempts at implant placement at failed sites in 330 patients. The weighted mean survival rates for the second and third attempts at implant placement in a previously failed site were calculated to be 88.05% and 74.19%, respectively. A total of 14,395 implants were included in smoking analysis. Of these, 10,403 implants were placed in non-smokers with 250 failures and 3,992 placed in smokers, with 205 failures. The calculated overall weighted mean implant-level survival was 97.67% in non-smokers and 95.03% for in smokers. Lastly, six studies reported on 591 implants placed in periodontally compromised patients with a total of 15 failures and 198 implants placed in periodontally healthy patients with just one failure. The overall weighted mean implant survival rate was calculated to be 97.48% in periodontally compromised patients compared to 99.49% for periodontally healthy patients.

Conclusions: Of the three risk factors evaluated in this review, rough surface implants placed in previously failed sites presents the highest risk for implant failure. Rough surface implant survival declines significantly for each additional attempt at implant placement at a previously failed site, with weighted mean survival rates of 88.05% and 74.19% for the second and third attempts, respectively. Although more favorable than previously used implant designs, smokers continue to experience lower survival rates compared to non-smokers, with overall weighted mean implant survival rates of 95.03% and 97.67%, respectively. A similar finding was found for implants placed in patients with a history of chronic periodontitis. The calculated weighted mean survival rate was 99.49% for periodontally healthy patients compared to 97.48% for periodontally compromised patients.

APA, Harvard, Vancouver, ISO, and other styles
31

Santiago, Júnior Joel Ferreira. "Avaliação da influência de diferentes materiais oclusais na confecção de próteses fixas implantossuportadas unitárias com diferentes diâmetros dos implantes osseointegrados : estudo pelo método dos elementos finitos tridimensionais /." Araçatuba : [s.n.], 2010. http://hdl.handle.net/11449/93588.

Full text
Abstract:
Resumo: A literatura científica ainda é escassa em relação à influência de diferentes materiais na confecção de próteses fixas implantossuportadas unitárias em relação aos diferentes diâmetros dos implantes osseointegrados na distribuição das tensões; as suas manifestações e repercussões na prática clínica ainda não estão totalmente esclarecidas, sendo a fundamentação científica indispensável. Assim, o objetivo desta dissertação foi avaliar a influência do material de revestimento oclusal na confecção de prótese fixa implantossuportada unitária com diferentes diâmetros de implantes osseointegrados. Para o estudo foram elaborados 08 modelos, representando cada qual uma secção de osso mandibular (osso esponjoso e cortical), com a presença apenas de um implante (Conexão Master Screw, Sistemas de Próteses, São Paulo, Brasil) do tipo hexágono externo de 3.75 mm x 10 mm (4 modelos) e de 5.00 mm x 10 mm (4 modelos) com coroas de porcelana feldspática, ou de resina acrílica, ou de resina composta ou coroa liga de NiCr. Para confecção dos modelos foram utilizados os programas de desenho assistido: Rhinoceros® 3D 4.0 (NURBS Modeling for Windows, EUA) e SolidWorks® 2006 (SolidWorks Corp, Massachusetts, USA). Os desenhos tridimensionais foram exportados para o programa de elementos finitos NEI Nastran® 9.0 (Noran Engineering, Inc, EUA), para geração da malha, aplicação da carga e análise. Os resultados foram visualizados através dos mapas de tensão von Mises de cada modelo proposto, a fim de avaliar as variações individuais da distribuição das tensões no implante e na coroa; no osso os resultados foram visualizados através dos mapas de tensão máxima principal. Na carga axial (200 N), o osso cortical não mostrou grandes diferenças entre todos os modelos e o osso trabecular sofreu um aumento das tensões por tração... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The scientific literature is still scarce about the influence of different veneering materials used in fabricating superstructures for implant-retained fixed prostheses in relation to different implant diameters on stress distribution, and the manifestations and implications in clinical practice were not clarified. The aim of this dissertation was to evaluate the influence of occlusal material for single implant-supported fixed prostheses with different implant diameters. For this study were simulated 8 models, representing a section of the mandibular bone (trabecular and cortical bone) with a single external hexagonal implant (Master Screw, Conexão Sistema de Prótese ltda., Sao Paulo, Brazil) of 3.75 x 10 mm (4 models) and 5.00 mm x10 mm (4 models) with a crown with different occlusal materials: feldspathic porcelain crowns, or acrylic resin or composite resin crown or NiCr alloy. The models were designed using computer-aided design softwares : Rhinoceros® 3D 4.0 (NURBS Modeling for Windows, USA) and SolidWorks® 2006 (SolidWorks Corp., Massachusetts, USA). The three-dimensional designs were exported to the finite element program NEI Nastran® 9.0 (Noran Engineering, Inc, USA) for mesh generation, load application and analysis. The results were visualized through von Mises stress maps of each model, to assess individual variations of the stress distribution on the implant and crown; bone results were visualized through maps of maximum principal stress. In axial loading (200 N), cortical bone showed no significant differences in all models,on the trabecular bone the tensile stress increased, with regular implant diameter. For non-axial loads (100 N), the cortical bone, the tensile stress increased significantly on the side common the load application, when it reduced the implant diameter; in the trabecular bone showed seemed stress patterns, although more... (Complete abstract click electronic access below)
Orientador: Eduardo Piza Pellizzer
Coorientador: Fellippo Ramos Verri
Banca: Paulo Sérgio Perri de Carvalho
Banca: Alcides Gonini Júnior
Mestre
APA, Harvard, Vancouver, ISO, and other styles
32

Sanli, Yurdanur. "Characterization of the interface between prefabricated dental implant component and cast dental alloys." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1168720214.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Pérez, Delgado José Delfín. "Prótese implanto‒suportada aparafusada vs. cimentada." Master's thesis, [s.n.], 2015. http://hdl.handle.net/10284/5069.

Full text
Abstract:
Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária
A procura de reabilitações orais cada vez mais próximas dos dentes naturais contribuiu para a evolução das técnicas de reabilitação oral, nomeadamente na área da implantologia, onde atualmente são levantados vários paradigmas, entre os quais se encontra a discussão entre a utilização de próteses cimentadas versus as próteses aparafusadas. Neste trabalho é feita uma revisão da literatura e uma comparação em relação aos dois tipos de retenção de prótese fixas implanto‒suportadas. Para isso foram analisados vários fatores com influência no sucesso ou insucesso dos dois tipos de restaurações como: estética, oclusão, resistência, retenção, biomecânica, reversibilidade, ajuste passivo, efeitos biológicos, provisionalização, função imediata e hábitos parafuncionais. A resposta a esta discussão só é possível de ser obtida após uma exaustiva avaliação de cada caso de reabilitação, ponderando as vantagens e desvantagens de cada técnica, não havendo uma resposta geral para a questão de qual o melhor tipo de retenção. The search for oral rehabilitations more and more close from the natural teeth had contributed for the evolution of the oral rehabilitation techniques, namely in the implantology field, where nowadays are lifted several paradigms, among which is the discussion among the use of cement‒retained or screw‒retained prostheses. In this work it is done a literature review and a comparison in relation to the both types of implant‒supported fixed prostheses retention.For that propose several factors with influence on the success or failure of the both type of restorations were analyzed, such as: aesthetics, occlusion, resistance, retention, biomechanics, retrievability, passivity, biological effects, provisionals, immediate function and parafunctional activity. The answer to this discussion it’s only obtained after an exhaustive evaluation of each rehabilitation case, considering the advantages and disadvantages of each technique, without having a general answer for the question which is the best type of retention.
APA, Harvard, Vancouver, ISO, and other styles
34

Chang, Moontaek. "The peri-implant tissues from an esthetic perspective /." Göteborg : Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, 2009. http://hdl.handle.net/2077/20438.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Alyassin, Waleed. "The influence of heat production relative to drill wear during osteotomy preparation by different implant drill systems a comparison study between ceramic and conventional implant drill systems /." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11068.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2010.
Title from document title page. Document formatted into pages; contains vi, 41 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 37-41).
APA, Harvard, Vancouver, ISO, and other styles
36

Isaksson, Anders, and Michael Graham. "RoDent : Robotic Dentistry : Computer aided dental implant positioning system." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1559.

Full text
Abstract:

A study was carried in conjunction with the Orthodontic department at Halmstad General Hospital in Sweden to investigate the possibility of reducing cost and manufacture time of dental implant drill guides.

The current system involves sending a digital image in STL format to the Materialise factory in Belgium where information of the position of dental implants is translated onto a moulded mouthpiece. Drill guides are placed in the mouth piece which is then returned to the surgeon. The mouthpiece complete with drill guides is then placed in the patients mouth and used as a guide for the implant drill holes. The cost of 10000 sek and a turnaround time of 2 weeks gave rise to the need for a faster and cheaper solution.

A new mouthpiece was designed comprising of a solid cube which could be clearly seen on the x-ray. Linearisation of the cube faces is used to find a reference point from which to drive a 5 axis drilling platform. The mouthpiece is placed in the drill platform which is driven by stepper motors which in turn are controlled by a microcontroller. Co-ordinates are entered via a PC interface. The PC software then translates these co-ordinates into motor steps which are sent to the microcontroller. The drill platform then positions the mouthpiece in order to drill guide holes for the dental implants.

The study showed that the machine design gave an acceptable degree of accuracy and repeatability. Further enhancements could be made by automating the detection of the cube using image analysis techniques. The study was also limited by the lack of graphical and geometrical data concerning the position of the implant. For the purpose of this study the co-ordinates for the implants guides is entered by hand.

It was concluded that further software and hardware enhancement would be needed before the application could be developed commercially.

APA, Harvard, Vancouver, ISO, and other styles
37

Thor, Andreas. "On platelet-rich plasma in reconstructive dental implant surgery /." Göteborg : Departments of Biomaterials and Oral & Maxillofacial Surgery, the Sahlgrenska Academy at Göteborg University and the Department of Surgical Sciences, Oral & Maxillofacial Surgery, Uppsala University Hospital, 2006. http://hdl.handle.net/2077/745.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Hariri, Firdaus. "Alveolar distraction osteogenesis for dental implant rehabilitation inreconstructed jaws." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44661514.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Alzahrani, Abdullah Ali H. "Decision making and dental implant treatments in Saudi Arabia." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13095/.

Full text
Abstract:
Background: Little is known about dentist-patient interactions when engaging in decisions to have dental implants. Indeed, the process by which patients are selected for implant therapies is poorly understood. Although different models of decision making have been used to examine the decisions made in medical consultations these have yet to be explored in relation to the decisions to have dental implants. Likewise the role of power in the decision making process has never been explored in any depth. The aim of this study was to explore the decision making process associated with providing patients with dental implants. Methods: This study involved a cross-sectional ethnographic study using participant observation of dental consultations and follow-up semi-structured interviews of dentists and patients. Convenience sampling was used to select a wide range of consultations. Data were analysed using the framework method, inductive thematic analysis and typology strategy of analysing qualitative data. Results: Three dentists and thirty-two patients contributed in this study. No implant consultation involved a full shared decision making. Elderly patients ‘above 55 years’ with lower education levels tended to experience more paternalistic and interpretative decision making in their consultations. It was also found that power operated in the consultations through the use of authority, influence, manipulation, coercion and hidden decisions in the consultations. Conclusions and clinical implications: Improving the quality of healthcare and cutting undesirable outcomes are central advantages of shared decision making. Respecting patients’ autonomy, facilitating discussion on treatment options and gaining a better understanding and evaluation of patients’ preferences, needs and values are critical if the desire is to employ shared decision making in implant consultations. Reducing the misuse of power is also important. This might be achieved by a range of factors including increasing patients’ awareness, encouraging patients’ participation their consultations and focussing training on dentist interaction skills amongst other things.
APA, Harvard, Vancouver, ISO, and other styles
40

Ekstrand, Karl. "Applications of polymeric materials for implant fixed dental reconstructions." Stockholm : Kongl. Carolinska Medico Chirurgiska Institutet, 1988. http://catalog.hathitrust.org/api/volumes/oclc/17605959.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Coró, Vitor. "Análise comparativa da interface entre intermediários e estruturas fundidas e CAD/CAM em Co-Cr e zircônia antes e após queima de cerâmica e ciclagem mecânica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-08082013-154727/.

Full text
Abstract:
As próteses sobre implantes apresentam alto índice de sucesso, mas ainda existem relatos de complicações técnicas e mecânicas, principalmente em relação à adaptação e desaperto de parafusos. Técnicas CAD/CAM foram desenvolvidas tentando melhorar adaptação e passividade, e hoje existem vários materiais e sistemas como opção de trabalho. A proposta deste estudo foi avaliar, por meio de leitura em microscópio, a adaptação de próteses de três elementos sobre dois implantes confeccionadas em diferentes materiais, por diferentes técnicas, antes e após a queima de cerâmica. Também foi verificado se o método/material utilizado, assim como o grau de adaptação influenciariam no comportamento das peças frente a um ensaio de fadiga mecânica. Foram formados 5 grupos de 10 amostras (n=10). Após leituras, prensagem de cerâmica e ensaio de fadiga, os dados foram submetidos aos testes ANOVA e Tuckey-Kramers. As médias de desajuste vertical pré e pós aplicação da cerâmica (μm), quando ambos parafusos apertados foram para G1: Estruturas fundidas em Co-Cr com cilindros calcináveis (26,03 ± 18,4) e (36,5 ± 9) G2: Estruturas sobrefundidas em liga de Co-Cr, utilizando cilindros com base de Co-Cr (4,86 ± 5) e (10,5 ± 6); G3: Estruturas fundidas em liga de Co-Cr, associadas à técnica do cilindro cimentado (0 ± 0)e (0 ± 0); G4: Estruturas usinadas em Co-Cr CAD/CAM (0 ± 0) e (2,7 ± 2);G5: Estruturas usinadas em Zircônia CAD/CAM (14,87 ± 9) e (15,2 ± 8). Para a condição de medida com apenas um dos lados apertado, pré e pós cerâmica, do lado parafusado, os resultados foram para G1: 9,63 ± 1 e 34,8 ± 8; G2: 2,37 ± 5 e 11,9 ± 9; G3: 0 ± 0 e 0 ± 0; G4: 0 ± 0 e 3,4 ± 3; G5: 17,69 ± 1 e 20,8 ± 9. Para a condição de medida com apenas um dos lados apertado, pré e pós cerâmica, do lado desparafusado, os resultados foram para G1: 124,22 ± 37 e 129,8 ± 37; G2: 64,79 ± 47 e 80,6 ± 46; G3: 12,34 ± 17 e 2,1 ± 3; G4: 3,54 ± 5 e 17,6 ± 8; G5: 37,77 ± 25 e 42,4 ± 19. O torque de desaperto (Ncm) dos parafusos protéticos foi verificado antes e após ensaio de fadiga com 300.000 ciclos. Os valores médios encontrados foram respectivamente: G1: 5,80 ± 1,23 e 4,11 ± 1,16; G2: 6,30 ± 1,00 e 3,32 ± 0,87; G3: 5,63 ± 1,05 e 3,30 ± 1,46; G4: 7,24 ± 1,05 e 3,44 ± 1,62; G5: 7,75 ± 1,25 e 6,78 ± 1,18. Os grupos CC, Co-Cr CAD/CAM e Zi, apresentaram os melhores resultados quanto ao ajuste vertical, seguidos pelo grupo Co-Cr e calcinável. Os grupos CC, Co-Cr e Co-Cr CAD/CAM apresentaram perda de torque dos parafusos protéticos após oensaio de fadiga mecânica. O grupo Zi teve menor perda de torque entretodos grupos, comparando antes e após o teste de fadiga. Nenhum dos grupos apresentou perda de torque suficiente para que a prótese perdesse estabilidade da junção.
The implant-supported prostheses present a high success rate, but there are still reports of technical and mechanical complications, mainly regarding adaptation and loosening of screws. CAD/CAM techniques have been developed trying to improve adaptation and passivity, and today there are many options of materials and systems to work with. The purpose of this study was to evaluate, by microscope, fitting of three elements prostheses retained by two implants, made of different materials, different techniques, before and after ceramic firing. It was also verified if the method/material used, as well as the degree of adjustment would influence on the behavior of the prostheses after a fatigue test. Five groups of ten specimens were formed (n = 10). After reading, ceramic pressing and fatigue test data were submitted to ANOVA and Tukey-Kramer\'s tests. The mean vertical misfit pre and post application of ceramic (μm), whit both screws tightened to G1: Structures casted in Co-Cr with castable cylinders (26.03 ± 18.4) and (36.5 ± 9) G2: Structures casted in Co-Cr, with Co-Cr basis cylinder (4.86 ± 5) (10.5 ± 6); G3: Structures casted in Co-Cr associated with the cemented cylinder technique (0 ± 0) and (0 ± 0); G4: Machined structures in Co-Cr CAD/CAM (0 ± 0) and (2.7 ± 2), G5: Structures machined in zirconia CAD/CAM (14.87 ± 9) and (15.2 ± 8). To the measurement condition of only one side tighted, pre and post ceramic, on the tightned side, the results were G1: 9.63 ± 1 and 34.8 ± 8; G2: 2.37 ± 5 and 11.9 ± 9; G3: 0 ± 0 and 0 ± 0; G4: 0 ± 0 and 3.4 ± 3; G5: 17.69 ± 1 and 20.8 ± 9. To the measurement condition of only one side tightened, pre and post ceramic, on the untightened side, the results were in G1: 124.22 ± 37 and 129.8 ± 37; G2: 64.79 ± 47 and 80.6 ± 46; G3: 12.34 ± 2.1 and 17 ± 3; G4: 5 ± 3.54 and 17.6 ± 8; G5: 37.77 ± 25 and 42.4 ± 19. The loosening torque of the prosthetic screws (Ncm) was checked before and after fatigue test to 300,000 cycles. The mean values were: G1: 5,80 ± 1,23 e 4,11 ± 1,16; G2: 6,30 ± 1,00 e 3,32 ± 0,87; G3: 5,63 ± 1,05 e 3,30 ± 1,46; G4: 7,24 ± 1,05 e 3,44 ± 1,62; G5: 7,75 ± 1,25 e 6,78 ± 1,18. CC groups, Co-Cr CAD/CAM and Zi, showed the best results regarding vertical adjustment, followed by the Co-Cr group and castable. CC groups, Co-Cr and Co-Cr CAD/CAM presented loss of torque after fatigue test. The Zi group showed less loss of torque among all groups, comparing before and after fatigue test. None of the groups showed enough loosening to loose joint stability.
APA, Harvard, Vancouver, ISO, and other styles
42

Ayub, Karen Vaz. "Avaliação clínica e radiográfica de implantes curtos: estudo retrospectivo no período de 7 anos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-11062018-194524/.

Full text
Abstract:
Áreas edêntulas com severa reabsorção óssea têm sido reabilitadas com próteses fixas instaladas sobre implantes curtos, evitando que os pacientes sejam submetidos a cirurgias de reconstrução óssea. Este estudo retrospectivo descreve o comportamento de implantes curtos avaliados em um período de 7 anos. A amostra foi composta por 70 pacientes, de ambos os gêneros, que receberam 136 implantes, de 6 ou 8mm de comprimento (Straumann® bone level e tissue level standard plus) sobre os quais foram instaladas próteses unitárias e múltiplas, cimentadas e parafusadas. Foram realizadas avaliações clínicas e radiográficas mensurando a estabilidade do implante por frequência de ressonância, perda óssea marginal por meio de radiografias panorâmicas, índices de placa e de sangramento marginal, taxas de sobrevivência do implante e da prótese. Dois implantes instalados na mandíbula foram perdidos, resultando em uma taxa de sobrevivência de 98,3%. A taxa de sobrevivência das próteses foi de 100%; a média de perda óssea foi de - 0,28mm; a estabilidade média dos implantes foi de 76,515 ISQ; as médias dos índices de placa e de sangramento foram de 32,83% e 33,21%, respectivamente. A estabilidade do implante foi maior na mandíbula que na maxila (p = 0,006). Os resultados obtidos nesta pesquisa, possibilitam afirmar que os implantes curtos podem ser utilizados com segurança dentro de suas indicações específicas.
Edentulous areas with severe bone resorption have been rehabilitated with fixed prostheses installed on short implants, avoiding surgeries of bone reconstruction. This retrospective study describes the behavior of short implants evaluated during 7 years. The sample consisted of 70 patients, of both genders, who received 136 implants, 6 or 8mm in length (Straumann® bone level and tissue level standard plus) on which single and multiple, cemented and screwed prostheses were installed. Clinical and radiographic evaluations were performed by measuring implant stability by resonance frequency, marginal bone loss by panoramic radiographs, plaque and marginal bleeding rates, the implant and prostheses survival rates. Two implants installed in mandible were lost, resulting in a survival rate of 98,3%. The prostheses survival rate was 100%; mean bone loss was -0,28mm; mean implants stability was 76,52 ISQ; mean plaque and bleeding indexes were 32,83% and 33,21%, respectively. The implant stability was higher in the mandible than in the maxilla (p = 0.006). The results obtained in this research make it possible to state that short implants can be used safely within their specific indications.
APA, Harvard, Vancouver, ISO, and other styles
43

Ramos, Marcelo Barbosa. "Avaliação da capacidade de selamento de intermediários UCLA em um sistema de implante de hexágono externo." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-11112013-153728/.

Full text
Abstract:
Objetivo. Avaliar a capacidade de selamento e a adaptação de intermediários UCLA, com ou sem uma cinta de cobalto-cromo (CoCr), em um sistema de implante de hexágono externo. Materiais e métodos. 120 implantes hexágono externo (Sistema de Implante Nacional - SIN, SP, Brazil) foram dividos em dois grupos (n=60) para receber intermediários UCLA de 6 fabricantes (n=10), com ou sem cinta pré-fabricada de CoCr (n=60). Os intermediários foram fundidos e subdivididos em 12 grupos da seguinte forma: M (Microplant), I (Impladen), S (SIN), Sv (Signo Vinces), T (TitaniumFix), and B (Bionnovation). A capacidade de selamento foi determinada pela colocação de 0.7 μL de azul de toluidina, 0.1% (TB) no espaço interno dos implantes antes do torque nos intermediários. Os espécimes implante-intemediários foram colocados dentro de tubos de 2.0 mL, contendo 0.7 mL de água destilada, a fim de manter a interface implante-intemediário submersa. Amostras de 100 μl foram coletadas após 1, 3, 6, 24, 48, 72, 96 e 144 horas de incubação para medição da absorbância em um espectofotômetro e devolvidos para medidas subsequentes. Para análise estatística, foram empregados o teste ANOVA a dois critérios (p < 0.05) e o teste de Tukey. Microscopia eletrônica de varredura (MEV) foi usado para visualização da adaptação da interface implante-intermediário. Resultados. Os grupos M, Sv, e T sem cinta CoCr apresentaram completa liberação de corante (TB) em 1 h, enquanto que nos grupos I, S, e B, a liberação do corante ocorreu em 3, 24 e 96 h, respectivamente. Para os intermediários com cinta préfabricada, a completa liberação de corante ocorreu em 6 h para o grupo S, em 24 h para os grupos Sv, T e B, e em 72 h para os grupos M e I. Foram observados desajustes na interface implante/intermediário em todos os grupos. Os desajustes mais evidentes foram observados para os grupos M e T, sem cinta de CoCr. Conclusões. A completa liberação de corante foi observada em diferentes períodos de tempo para todos intermediários UCLA, independentemente, da presença ou não da cinta CoCr. Foram observados espaços ou desajustes na interface implante/intermediário em todos os grupos.
To evaluate the effect of the presence of a prefabricated cobalt-chromium (CoCr) margin in a universal castable long abutment (UCLA) in the sealing capability and fit of the implant-abutment mating zone. Materials andmethods. One-hundred and twenty external hexagon implants (SIN, SP, Brazil) were divided in two groups (n=60 each) to receive UCLA abutments from 6 manufacturers (n=10 each) either with or without a CoCr margin (n=60 each). Abutments were cast and 12 groups were formed and named as: M (Microplant), I (Impladen), S (SIN), Sv (Signo Vinces), T (TitaniumFix), and B (Bionnovation). Sealing was determined by placing 0.7 μL of 0.1% toluidine blue (TB) in the implant wells before abutment torquing. Implant-abutment samples were placed into 2.0 mL vials containing 0.7 mL of distilled water to maintain the implant-abutment interface submerged. Aliquots of 100 μl of water were retrieved at 1, 3, 6, 24, 48, 72, 96 and 144 hours incubation times for absorbance measurement in a spectrophotometer, and returned for repeated measurements. Two-way ANOVA (p < 0.05) and Tukey\'s test were used. Scanning electron microscopy (SEM) was used for observation of the implant-abutment fit. Results. Groups M, Sv, and T without the CoCr margin resulted in complete release of TB at 1 h, whereas I, S, and B did at 3, 24 and 96 h, respectively. Complete leakage in abutments with the prefabricated marginoccurredat 6 h for S, 24 h for Sv, T and B, and 72 h for M and I. Implant/abutment gaps were observed in all groups. A poorer fit was depicted for groups M and T without the CoCr margin. Conclusions. Complete leakage was observed for all UCLA abutments regardless of the presence of the CoCrmargin. Implant-abutment gaps was observed for all groups.
APA, Harvard, Vancouver, ISO, and other styles
44

Menezes, Karyna de Melo. "Efic?cia do tratamento n?o-cir?rgico em indiv?duos com mucosite peri-implantar." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17837.

Full text
Abstract:
Made available in DSpace on 2014-12-17T15:43:54Z (GMT). No. of bitstreams: 1 KarynaMM_DISSERT.pdf: 1613458 bytes, checksum: 37ceb3c8bc9380fd82bea372ee1cedb7 (MD5) Previous issue date: 2014-02-20
It has been shown that the development of peri-implant mucositis is associated with biofilm accumulation. It is believed that the therapeutic approaches used in periodontal disease may have a positive effect in the cases of peri-implant disease. The aim of this study was to evaluate the effectiveness of non-surgical treatment of peri-implant mucositis, with or without the use of chlorhexidine 0,12% in subjects rehabilitated with osseointegrated implants. Thus, patients were randomly divided into test group (chlorhexidine surgical therapy) and control (non-surgical treatment). This therapy consisted of an adaptation of the (Full Mouth scalling and Root Planing) nonoperative protocol FMSRP, but without the use of ultrasound. The visible plaque index (VPI), gingival bleeding index (GBI), probing depth (PD), bleeding on probing (BOP) and keratinized mucosa clinical parameters were evaluated at baseline and at different times after treatment. The data were not normally distributed and the implant was considered the sampling unit. Data were analyzed using Fri edman and Wilcoxon chi-square (=5%), tests using the Statistical Package for Social Sciences 17.0 (SPSS). Thus, 119 implants were evaluated, 61 in the test group and 58 in the control group. The results showed statistically significant differences for the variables: average BTI implants in both groups (p<0,001), mean ISG implants both in the test group (p<0,001), and control (p= 0,006) of implants; PS for the test group (p< 0,001) and control (p = 0,015) and SS (p<0,001) in the two treatment groups. However, there was no statistically significant difference when the groups were compared. The PS and SS variables showed no statistically significant difference in any of independent interest to the study (age, sex, smoking, treatment group, keratinized mucosa at different times, peri-implant biotype, average VPI implants and GBI). Thus, it can be concluded that both the mechanical treatment isolated as its association with chlorhexidine mouthwash 0.12% can be used for the treatment of peri-implant mucositis. Moreover, the condition of oral h ygiene has improved between baseline and six months and the depth and bleeding on probing decreased after three and six months
Tem sido demonstrado que o desenvolvimento da mucosite peri-implantar est? associado ao ac?mulo de biofilme dent?rio. Acredita-se que as abordagens terap?uticas utilizadas nas doen?as periodontais podem apresentar efeito positivo nos casos de doen?as peri-implantares. O objetivo desse estudo foi avaliar a efic?cia do tratamento n?o cir?rgico da mucosite peri-implantar em 119 implantes, sendo 61 no grupo teste (digluconato de clorexidina a 0,12%) e 58 no grupo controle (placebo), em indiv?duos reabilitados com implantes. Desta forma, os pacientes foram divididos aleatoriamente em grupo teste (terapia n?o cir?rgica + clorexidina) e controle (terapia n?o cir?rgica). Esta terapia consistiu de uma adapta??o do protocolo n?o-cir?rgico FMSRP (Full Mouth Scalling and Root Planing), por?m, sem a utiliza??o do ultrassom. Os par?metros cl?nicos ?ndice de placa vis?vel (IPV), ?ndice de sangramento gengival (ISG), profundidade de sondagem (PS), sangramento ? sondagem (SS) e mucosa queratinizada foram avaliados no baseline e em diferentes per?odos ap?s o tratamento. Os dados n?o apresentaram distribui??o normal e o implante foi considerado a unidade amostral. Os dados foram analisados por meio dos testes de Friedman, Wilcoxon e Qui-quadrado (=5%), utilizando o Statistical Package for Social Sciences 17.0 (SPSS). Os resultados mostraram que houve diferen?a estatisticamente significativa (p<0,05) para as vari?veis: m?dia do IPV dos implantes em ambos os grupos; m?dia do ISG dos implantes tanto no grupo teste, como controle dos implantes; PS para o grupo teste e controle e SS dentro dos dois grupos de tratamento. No entanto, n?o houve diferen?a estatisticamente significativa quando os grupos foram comparados. As vari?veis PS e SS n?o mostraram diferen?a estatisticamente significativa com nenhuma vari?vel independente de interesse para este estudo (idade, sexo, fumo, grupo de tratamento, mucosa ceratinizada nos diferentes tempos, bi?tipo peri-implantar, m?dia do IPV e ISG nos implantes). Desta forma, pode-se concluir que tanto a terapia mec?nica isolada como sua associa??o com bochechos de digluconato de clorexidina a 0,12% podem ser usados para o tratamento da mucosite peri-implantar. Al?m disso, a condi??o de higiene bucal melhorou entre o baseline e seis meses e a profundidade e sangramento ? sondagem reduziram ap?s tr?s e seis meses
APA, Harvard, Vancouver, ISO, and other styles
45

Alzoubi, Fawaz. "Pre-doctoral implant dentistry education: Trends, issues, and perspectives." Scholarly Commons, 2015. https://scholarlycommons.pacific.edu/uop_etds/46.

Full text
Abstract:
Implant dentistry has emerged as a very reliable and predictable option for replacing missing teeth. Implant education at the pre-doctoral level has been implemented in most parts of the world and is currently perceived as a fundamental discipline in dental education. Dental graduates today are expected to have knowledge and possess skills at the competence level in order to provide care for the growing number of patients seeking this treatment option, which may be the optimal option for the majority of their cases. However, very little is known about current trends, issues, and perspectives of implant dentistry education. This study builds a knowledge base about implant dentistry education in pre-doctoral dental education programs. It begins with an overview of the current state of implant dentistry education described in Chapter 1. Chapter 2 evaluates faculty perception in Kuwait University Faculty of Dentistry regarding case-based-learning, a pedagogy that has been recommended by multiple dental education institutions as the context within which pre-doctoral implant dentistry education should be taught. Chapter 3 presents an example of how case-based-learning pedagogy might be implemented in the form of a case report. Chapter 4 creates the link between faculty perception and student outcomes and presents an evaluation of students' competence level regarding pre-doctoral implant education. Finally, Chapter 5 provides a summary and synthesis of the three articles with a focus on placing this research within the larger body of scholarship on implant education and on identifying implications for policy, future scholarship, and practice.
APA, Harvard, Vancouver, ISO, and other styles
46

Sendyk, Daniel Isaac. "Influência dos fatores locais, sistêmicos e relativos ao cirurgião na osseointegração de implantes dentais: uma análise sistemática das evidências científicas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/23/23149/tde-27112017-115443/.

Full text
Abstract:
Os fatores que possam promover e incrementar a osseointegração, ou prejudicar o processo biológico, aumentando o índice de falhas, têm sido cada vez mais investigados com o objetivo de ampliar indicações e as taxas de sobrevivência dos implantes dentais assim como controlar fatores adversos. O objetivo desta tese foi identificar, analisar e sintetizar as evidências científicas quanto a influência das estatinas, do envelhecimento e da experiência do cirurgião no processo osseointegração e na sobrevivência de implantes dentais. Este volume apresenta um compilado de três revisões sistemáticas orientadas pelas recomendações PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). O processo de revisão foi realizado por meio de uma busca sistemática em cinco bases de dados eletrônicas (PubMed, Scopus, Web of Science, Embase e Cochrane Library), além de busca manual nas referências bibliográficas dos estudos incluídos. A meta-análise, quando cabível, foi realizada com o auxílio do software Review Manager (RevMan, Versão 5.3). O grau de heterogeneidade entre os estudos foi verificado por meio do teste Q de Cochran e I2. O viés das publicações foi avaliado com o auxílio das escalas Newcasttle-Ottawa e Cochrane Collaboration\'s Tool. A síntese dos dados permitiu a publicação de três artigos científicos dispostos nesta tese.
Factors that may promote and enhance osseointegration, or impair the biological process, have been increasingly investigated in order to expand the indications and survival rates of dental implants and control the adverse factors. The aim of this thesis is to identify and summarize the scientific evidence of statins, ageing and surgeon related factors that can influence osseointegration and survival of dental implants. This volume presents a compilation of three systematic reviews structured by PRISMA guidelines (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). The review process was carried out through a systematic search in five electronic databases (PubMed, Scopus, Web of Science, Embase and Cochrane Library) and bibliographical references of the included studies. Meta-analyses, when appropriate, were performed using the software Review Manager (RevMan version 5.3). The degree of heterogeneity in the studies was verified by Q Cochran test and I2. The bias of the publications was assessed with the assistance of Newcastle-Ottawa Scale and Cochrane Collaboration Tool\'s. The synthesis of the data was included in three papers prepared for this thesis.
APA, Harvard, Vancouver, ISO, and other styles
47

Khzam, Nabil Omar. "Dimensional changes in the supporting tissues following immediate placement and restoration of dental implants in the aesthetic zone: a retrospective study." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/367839.

Full text
Abstract:
Aim: The objective of this retrospective study was to assess the survival rate and the hard and soft tissue response following immediate placement and provisional restoration of single-tooth implants in the aesthetic zone. Materials and Methods: Thirty-four patients (13 male and 21 female) with 37 immediately placed and restored implants (Astra-Tech® AB, Mölndal, Sweden) were identified as eligible to participate in this retrospective study. Thirteen of these patients returned for the follow-up examination. All participating patients underwent the same treatment strategy which was removal of the failed tooth, flapless surgery, immediate implant placement and the connection of a screw-retained temporary restoration. Reasons for tooth loss included failed root canal treatment, trauma and tooth resorption. Three months following implant placement, the temporary crowns were replaced by the definitive restorations. Implant survival rates and hard and soft tissue changes were measured using photographs and peri-apical x-rays. The range of observation period was between 12 to 27 months with a mean period of 16 ± 5 months. Results: At 16 ± 5 months, all implants were present at the time of follow-up with no complications, resulting in an implant survival rate of 100%. Radiographic evaluation revealed that there was no statistical difference in bone loss mesially and distally between baseline and follow-up. Clinical evaluation of the soft tissue revealed no statistically significant changes in mesial papilla, distal papilla and mid-facial tissue stability throughout the observation period. Conclusions: Within the limitation of this retrospective study, immediate implant placement and provisional restoration in the aesthetic zone of the maxilla can result in acceptable treatment outcomes as well as stable peri-implant tissues after a follow up period of 16 ± 5 months using the Astra Tech implant system.
Thesis (Masters)
Master of Philosophy (MPhil)
School of Dentistry and Oral Health
Griffith Health
Full Text
APA, Harvard, Vancouver, ISO, and other styles
48

Gastaldo, José Fabio Guastelli. "Análise fotoelástica das tensões ao redor dos implantes, na região de mandíbula, com aplicação de força em próteses tipo protocolo, revestidas em resina acrílica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/23/23150/tde-29052013-154831/.

Full text
Abstract:
Introdução: O objetivo desta pesquisa é analisar, pelo método fotoelástico, o comportamento das tensões que ocorrem nas estruturas periimplantares, em suportes de prótese fixa, segundo o protocolo de Brånemark, parafusada sobre cinco implantes, de diferentes comprimentos (10mm; 13mm e 15mm), quando submetidas às cargas oclusais. Métodos: Foram construídos três modelos fotoelásticos de mandíbulas: MD10; MD13 e MD15, com cinco implantes cada um, de 3,75mm de diâmetro, hexágono interno e posicionados paralelamente na região interforaminal. Sobre os implantes, em cada modelo, foram instalados pilares do tipo micro unit com cinta de 1mm e, sobre eles, uma única prótese, com uma infraestrutura metálica em cobalto/cromo, com cantilever de 15mm, revestida em resina acrílica. Foram aplicadas pressões de 1,0 e 3,0 bars e as imagens foram fotografadas e avaliadas. Resultados: Os resultados mostraram que as maiores tensões ocorreram nos implantes com 10mm de comprimento e o padrão de tensões se manteve nos vários comprimentos de implantes, mudando apenas a magnitude das tensões ao longo do corpo do implante. O incremento do comprimento foi relevante quanto à diminuição dos níveis de tensão na região analisada no modelo. Conclusões: Conclui-se que: 1) Os implantes de maior comprimento distribuíram melhor as tensões ao longo do corpo do implante; 2) As tensões se localizaram mais apicalmente, tanto por mesial como distal, nos implantes de maior comprimento, 3) Os implantes que sofreram maiores tensões foram os mais próximos do cantilever e o implante central.
The purpose of this study was to analyze, using the photoelasticity method, the behavior of stresses occurring in peri-implant structures and fixed prosthesis supports following Brånemark protocol that are screwed on five implants of different lengths, 10mm; 13mm and 15mm, when submitted to occlusal loads. Three mandible photoelastic models were built: MD10; MD13 and MD15, with five implants each, 3.75mm of internal diameter and located in parallel with each other in the interforaminal region. Microunit pillars were installed on each implant model with a 1mm-belt, and a single prosthesis was installed over them with a cobalt/chrome metallic infrastructure covered with thermoplastic acrylic resin. Loads of 1.0 and 3.0 bars were applied and images were photographed and evaluated. Results showed that highest tensions occurred in 10mm-length implants; the patterns of stresses was the same in implants of different lengths and only the magnitude of stresses changed along implant body. The greater the length the lower the stress in the analyzed region of the model. We concluded that: 1) The implants of greater length tension better distributed along the body of the implant. 2) Tensions were located more apically by both mesial and distal implants of greater length. 3) The implants have suffered greater tensions were the closest to the cantilever and implant center.
APA, Harvard, Vancouver, ISO, and other styles
49

Östman, Pär-Olov. "On various protocols for direct loading of implant-supported fixed prostheses /." Göteborg : Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, Göteborg University, 2007. http://hdl.handle.net/2077/7617.

Full text
APA, Harvard, Vancouver, ISO, and other styles
50

Mahmoud, Hussein. "A description of dental implants placed at Tygerberg Oral Health Centre." University of the Western Cape, 2019. http://hdl.handle.net/11394/7532.

Full text
Abstract:
Magister Scientiae Dentium - MSc(Dent)
Purpose This study analyzed the dental surgical implant therapy in the past 5 years at Tygerberg Oral Health Centre, UWC Dental School, Cape Town, South Africa. The findings of this study serve as a guideline for the estimation of the prevalence in this dental hospital. The importance of this study was to aid in the establishment of the formalized electronic database for dental implant therapy. The data generated will form a foundational basis for future studies that may be conducted in the field of implantology. Methodology A retrospective cross-sectional study was conducted at the Tygerberg Oral Health Centre. The data was collected from the implant dental records for the years 2012-2017. Variables measured included the patient demographics such as age, gender, an implant placed by type, length, width, and anatomical location. Frequencies and means of data were generated using IBM SPSS v20.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Dental implant' for other source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography