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1

Uram-Tuculescu, Sorin Essick Gregory K. "Masticatory function of the dentulous versus prosthodontically treated edentulous mandible." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1849.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2008.
Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Master of Science in the School of Dentistry Prosthodontics." Discipline: Prosthodontics; Department/School: Dentistry.
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2

Santos, Leonardo Soriano de Mello 1976. "Mechanical evaluation of trauma in human edentulous mandible = Avaliação mecânica de traumas em mandíbula humana desdentada." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290288.

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Orientador: Felippe Bevilacqua Prado
Texto em português e inglês
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo foi analisar a distribuição de tensões de cargas aplicadas em sínfise de mandíbula desdentada humana de idoso por meios de análise fotoelástica e de elementos finitos. Foram analisadas correlações entre as cargas aplicadas e as tensões registradas. Os testes de carga em resina fotoelástica foram realizados em uma máquina acoplada a um polariscópio e uma câmera digital. Cargas perpendiculares foram aplicadas em sínfise. Cargas variaram de 50 a 723 Newtons. Uma tomografia computadorizada foi realizada para gerar um modelo digital da mandíbula macerada. Os modelos computadorizados para a análise de elementos finitos (AEF) foram caracterizados de acordo com as propriedades mecânicas da resina epóxi e do osso. As áreas 1, 2, 3 e 4 exibiram franjas isocromáticas de ordem 2 em cargas 150 a 300N, e franjas de ordem 3 em cargas de 350 a 700N. Os stresses de vonMises se distribuíram similarmente em ambos os modelos caracterizados como resina epóxi e osso.Houve uma excelente (rP> 0.9) e significante (p < 0.05) correlação entre as cargas aplicadas e as respostas obtidas em todas as áreas apesar de algumas delas como as 9 e 10 no corpo mandibular que demonstraram correlações muito boa (rP> 0.7) e significante (p <0.05) respectivamente
Abstract: The aim of this study was to analyze the distribution of stresses from loads applied on symphysis in human elderly edentulous mandible by photoelastic analysis and FEA. Correlations between the applied load and stress tension at each evaluated area were evaluated. Load tests on the photoelastic resin model of edentulous macerated hemimandible were performed in a testing machine equipped with polariscope and a digital camera. Perpendicular loads were applied on symphysis area.Loads ranged from 50 to 723 N. CT was performed on the same mandible used to generate the photoelastic resin model. Computational models to the FEA were characterized according to the mechanical properties of epoxy resin and bone. 1, 2, 3 and 4 areas showed fringes order 2 in loads of 150 to 300N, and fringes order 3 in loads of 350 to 700N. von Mises stress were distributed similarly in both characterized models, epoxy resin and bone. There was an excellent (rP> 0.9) and significant (p < 0.05) correlation between the loads applied and the responses obtained in all areas, regardless of the area considered but areas 9 and 10 for the mandibular body, which showed very good (rP> 0.7) and significant (p <0.05)correlation
Doutorado
Anatomia
Doutor em Biologia Buco-Dental
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3

Villafranca, Melissa. "Factors governing the quantity and shape of alveolar bone in the edentulous maxilla and mandible." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31555.

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Bone is constantly undergoing remodeling of its bony matrix in response to various stimuli impinged upon the tissue. Bony remodeling occurs in both the dentate and edentulous states, but the edentulous lose more bone over time. This study analyzed sex, age and years edentulous for their influence on the height, width and shape of the anterior residual alveolar ridge of the jaws. Significantly greater amounts of mandibular residual alveolar bone height were found in males (p < 0.0001) and in those with more edentulous years in the maxilla (p = 0.003). The maxilla showed significantly greater amounts of residual alveolar bone height in the group with fewer edentulous years (p = 0.004). No significant associations were detected when sex, age and years edentulous were compared with anterior maxillary bone width. Statistical analysis of this study population also revealed no significant associations between sex, age, and years edentulous and anterior maxillary bone shape.
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4

Shelley, Andrew Martyn. "Aspects of imaging of the anterior region of the edentulous mandible prior to dental implant placement." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7206/.

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Objectives To gain an understanding of the imaging prescription of implant practitioners when placing implants in the anterior edentulous mandible and to investigate the impact of cross sectional imaging on diagnostic thinking, treatment planning and patient outcome. Methods •A web-based questionnaire presented two realistic clinical scenarios of edentulous patients. Participants were asked to prescribe imaging prior to implant placement. •A systematic review was conducted to determine if pre-operative availability of cross-sectional imaging has an impact on diagnostic thinking, therapeutic impact or impact on patient outcome when placing dental implants in the anterior mandible. •A before-after study of osteotomy preparation was undertaken using simulations of four edentulous mandibles, recording the incidence of perforations of the lingual surface. Participants were presented with conventional imaging in the “before” part of the study and conventional imaging with CBCT in the “after” part of the study. Two cases were regarded as “regular” and two as “challenging”. Results •169 dentists were surveyed with an 80% response. The results showed no agreement on prescription of imaging methods. •The systematic review identified only five relevant studies. These were clinically diverse with high risk of bias. •In the before-after study, there were no perforations in the regular cases either before or after the availability of CBCT. There were fewer perforations in the challenging cases after the availability of CBCT but this difference was not statistically significant. Conclusions •The imaging prescription of dentists when planning implant placement in the anterior edentulous mandible is chaotic. •The systematic review found no evidence to support any specific imaging modality when planning implant placement. •The before-after study provided very weak evidence that CBCT may be helpful in avoiding perforations in challenging cases.
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Kern, M., W. Att, E. Fritzer, S. Kappel, R. G. Luthardt, T. Mundt, D. R. Reissmann, et al. "Survival and Complications of Single Dental Implants in the Edentulous Mandible Following Immediate or Delayed Loading: A Randomized Controlled Clinical Trial." Sage, 2018. https://tud.qucosa.de/id/qucosa%3A35799.

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It was the aim of this 24-mo randomized controlled clinical trial to investigate whether the survival of a single median implant placed in the edentulous mandible to retain a complete denture is not compromised by immediate loading. Secondary outcomes were differences in prosthetic complications between the loading principles. Each of the 158 patients who received an implant was randomly assigned to the immediate loading group (n = 81) or the delayed loading group (n = 77). Recall visits were performed 1 mo after implant placement (for only the delayed loading group) and 1, 4, 12, and 24 mo after implant loading. Nine implants failed in the immediate loading group, all within the first 3 mo of implant loading, and 1 implant failed in the delayed loading group prior to loading. Noninferiority of implant survival of the immediate loading group, as compared with the delayed loading group, could not be shown (P = 0.81). Consistent with this result, a secondary analysis with Fisher exact test revealed that the observed difference in implant survival between the treatment groups was indeed statistically significant (P = 0.019). The most frequent prosthetic complications and maintenance interventions in the mandible were retention adjustments, denture fractures, pressure sores, and matrix exchanges. There was only 1 statistically significant difference between the groups regarding the parameter “fracture of the denture base in the ball attachment area” (P = 0.007). The results indicate that immediate loading of a single implant in the edentulous mandible reveals inferior survival than that of delayed loading and therefore should be considered only in exceptional cases (German Clinical Trials Register: DRKS00003730).
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Liddelow, Glen J. "The immediately loaded single implant retained mandibular overdenture : a 3 year prospective study." University of Western Australia. School of Dentistry, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0072.

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The purpose of this study was to ascertain whether simplifying mandibular overdenture treatment utilising single stage surgery and immediate prosthetic loading of a single implant, will achieve similar implant success rates and functional improvement to that expected using conventional techniques. As part of this study, the Mk III Brånemark implant with an oxidised surface (TiUnite™ Nobel Biocare AB, Göteborg, Sweden) was compared to the classical machined Mk III Brånemark fixture.Materials and Methods: 35 patients with a mean age of 68 years and problematic mandibular dentures were treated. The primary complaints among the patients referred to the clinic for treatment related to poor retention of the mandibular denture, instability, denture sores and phonetic problems. Patients were initially placed randomly into the “machined surface” or “oxidised surface” group. A single implant was placed into the mandibular midline with high initial stability. A ball attachment was placed and the retentive cap incorporated into the existing denture. Reviews took place at 3,12 6 6 and 36 months. Clinical assessments, radiographs made with custom film holders, and stability measurements by both manual and resonance frequency analysis methods were recorded. All complications, failures, maintenance and reasons for dropout were noted. Visual analogue scale questionnaires were utilised to record patient satisfaction. (ANOVA p<.05) Results: Three out of 8 machined surface implants failed, representing an unacceptably high failure rate (37.5%). The machined surface was therefore discontinued for this study. Three oxidised surface implants did not achieve sufficient primary stability to be immediately loaded, so were treated with a two stage delayed loading protocol. The 25 immediately loaded oxidised surface implants were all classified as surviving at the 36-month recall. Patient satisfaction was very high with a significant increase in all comfort and functional parameters. Conclusions: Within the limitations of this study and research design, it appears that the immediately loaded single implant retained mandibular overdenture, using an oxidised implant surface in a small group of maladaptive patients, can provide a beneficial treatment outcome over a three year observation period. If insufficient stability at insertion is not achieved for immediate loading, then a delayed loading protocol should be utilised.
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Chang, Kuang-Han Cooper Lyndon F. "A comparative study of three-implant supported fixed dentures and two-implant retained overdentures in edentulous mandible treatment efficacy and patient satisfaction /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1347.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2007.
Title from electronic title page (viewed Apr. 25, 2008). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Prosthodontics, School of Dentistry." Discipline: Prosthodontics; Department/School: Dentistry.
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8

Kuoppala, R. (Ritva). "Outcome of implant-supported overdenture treatment." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526210889.

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Abstract The retention of a complete denture and the patient’s adaptation varies considerably among different individuals. Resorption of the edentulous alveolar ridge differs greatly and some patients need implant-retained overdentures to enable adequate retention of their prostheses. In some extreme cases it is necessary to increase the volume of the alveolar ridge with bone grafts. The aim of this study was to examine the outcome of implant-supported overdenture treatment conducted in Oulu University Hospital. The aim was also to assess the impact of treatment on oral health-related quality of life and patient satisfaction. The study group was comprised of patients treated with a mandibular or maxillary implant overdenture and a group of patients with extreme mandibular bone resorption treated with extraoral bone grafts and implants. The treatments were performed in 1985–2013 thus also providing long-term results. The results of this study showed predictable and successful treatment outcomes also among elderly patients and in severe situations with bone deficiency. The most frequent complication in the clinical follow-up was loosening of the retention mechanism, commonly noted in other previous studies. Despite some minor mechanical defects in prosthetic structures or mild mucosal inflammation around the implants, they did not hinder everyday use of the prostheses. Neither the number of supporting implants nor the connection type seemed to have a great impact on patient satisfaction. Older patients with a mandibular overdenture seemed to be most satisfied. In conclusion, treatment with implant overdentures seems to be successful also in the long-term
Tiivistelmä Kokoproteesin pysyvyys ja potilaan sopeutuminen proteesiin vaihtelee huomattavasti eri yksilöiden välillä. Hampaattoman luuharjanteen resorptiossa on eroja, ja osalle potilaista implanttikiinnitteinen peittoproteesi on välttämätön riittävän proteesin pysymisen mahdollistamiseksi. Hyvin pitkälle edenneissä luuharjanteen resorptioissa voi leukaluun lisääminen luusiirteillä olla tarpeellista. Tutkimuksen tarkoituksena oli selvittää Oulun yliopistollisessa sairaalassa tehtyjen implanttikiinnitteisten peittoproteesihoitojen tuloksia. Tavoitteena oli myös arvioida hoidon vaikutusta suunterveyteen liittyvään elämänlaatuun ja potilastyytyväisyyteen. Tutkittava ryhmä koostui potilaista, joille oli valmistettu alaleukaan tai yläleukaan implanttikiinnitteinen peittoproteesi, ja potilasjoukosta, jolle hyvin pitkälle edenneen luuresorption vuoksi implanttihoito oli tehty luusiirteiden avulla. Hoidot tehtiin vuosina 1985–2013, ja tutkimuksissa voitiin arvioida myös peittoproteesihoidon pitkäaikaistuloksia. Tutkimus osoitti, että hoitotulokset olivat ennustettavia ja onnistuneita myös iäkkäillä potilailla sekä potilailla, joilla luupuutos oli kaikkein vaikein. Yleisin todettu komplikaatio kliinisessä tutkimuksessa oli proteesin kiinnitysmekanismin löystyminen. Pienet proteesirakenteiden rikkoutumiset tai lievät limakalvon tulehdusreaktiot implanttien ympärillä eivät kuitenkaan haitanneet proteesin toimintaa ja päivittäistä käyttöä. Peittoproteesia tukevien implanttien määrällä tai kiinnitystyypillä ei todettu olevan suurta vaikutusta potilastyytyväisyyteen. Kaikkein tyytyväisimpiä vaikuttivat olevan iäkkäät potilaat, joille oli tehty alaleuan peittoproteesi. Tutkimus osoittaa, että implanttikiinnitteinen peittoproteesihoito on menestyksellistä myös pitkällä aikavälillä
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Guevara, Perez Sonia. "Developpement par éléments finis d'un modèle virtuel personalisable de la mandibule humaine comme un outil de simulation biomécanique en sciences dentaires." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0576.

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Les facteurs déterminants des caractéristiques biomécaniques chez la mandibule humaine sont les propriétés des tissues et sa géométrie externe et interne. Des procédures non-invasives pour prédire de façon précise, les contraintes des mandibules soumis aux stress mécaniques sont importantes dans des diverses situations en Odontologie. Les modèles éléments finis (EF), montrent une bonne capacité d’évaluer les relations géométriques, mécaniques et fonctionnelles sur la mandibule. Malgré les progrès récents, la conception de modèles numériques présente encore des limites, liées au manque de connaissances des propriétés mécaniques de tous les tissus, à la conception intégrale du modèles et la possibilité de personnalisation de ceux-ci en tenant compte de la variabilité anatomique, morphologique, physiologique et biologique des individus. Le présent travail vise à définir un modèle d'éléments finis de la mâchoire pouvant être modélisé en fonction des conditions anatomiques et morphologiques particulières d'un individu, de manière à prédire avec précision les réponses mécaniques et biologiques de la mandibule. La définition des paramètres pertinents à l’obtention des modèles de simulation, permettra une évaluation in silico des réponses spécifiques chez les patients aux traitements pratiqués dans le domaine dentaire, en tenant compte de la variabilité morphologique de la mandibule associée aux pertes dentaires. L’objectif de cette recherche est la parameterisation géométrique et mécanique d’un modèle EF d’une mandibule, intégrant les particularités anatomiques d'un individu et permettant de prédire, avec précision, les réponses mécaniques vis-à-vis des traitements dentaires
The determining factors of biomechanical characteristics in the human mandible are the properties of the tissues and its external and internal geometry. Non-invasive procedures to predict accurately the mandible stress and strains under mechanical loads are important in a variety of dental situations. The finite element models shows a good ability to evaluate the geometric, mechanical and functional relations on the mandible. Despite recent advances, the design of numerical models still has limitations: the lack of knowledge of the mechanical properties of all tissues, the integral design of the models and the possibility of personalization of these, taking into account the anatomical, morphological, physiological and biological variability of individuals. The present work aims to define a model of finite elements of the jaw that can be modeled according to the particular anatomical and morphological conditions of an individual, in order to accurately predict the mechanical and biological responses of the mandible against loads or mechanical stimuli that affect them. The definition of the parameters relevant to obtaining the appropriate simulation models will enable an in silico assessment of any specific patient responses to dental treatments, in particular in dental implantology, taking into account the morphological variability of the mandible with dental losses. . The objective of this research is the geometrical and mechanical parametrization of an EF model of a mandible, integrating the anatomical particularities of an individual and allowing predicting with precision, the mechanical responses to dental treatments
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T?rres, Ana Clara Soares Paiva. "Falhas e complica??es com o uso de pr?tese parcial remov?vel inferior de extremidade livre bilateral." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17848.

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Aim: To determine the frequency and type of complications related to removable partial denture (RPD) less, Kennedy Class I, over time . Materials and Methods: This observational study consisted of a sample of 65 users PPR lower arches in Kennedy Class I and dentures, rehabilitated in the Department of Dentistry, Federal University of Rio Grande do Norte (UFRN). Patients were followed through periodic controls during periods of 60 days, 6 months and 1 year from installation. After the first year of control had other returns annually. The occurrence of complications or prosthetic failure was observed and recorded in a specific clinical record over 39 months. The patterns of failures observed were classified in the following situations: occurrence of traumatic ulcers after 2 months of installation, lack of retention, fracture or caries in the rest, fracture or dislocation of the artificial teeth, the larger connector fracture, fracture clip fracture support, poor support (need to reline the denture) and prosthesis fracture. Results: The incidence of complications was low frequency, being higher in the second year of use of the prosthesis. Among the complications that occurred more is the loss of retention (31.57%). Failures more severe and difficult to solve as the fracture elements of the metal structure of the PPR had low occurrence and were represented by only one case of the larger connector (5.3%) fractures. Conclusion: Removable partial dentures mandibular free end opposing of the conventional dentures have a low complication rate after 39 months of use when subjected to periodic controls
Objetivo: Verificar a frequ?ncia e tipo de complica??es relacionadas ? pr?tese parcial remov?vel (PPR) inferior, classe I de Kennedy, ao longo do tempo. Materiais e M?todos: Este estudo observacional foi composto por uma amostra de 65 usu?rios de PPR inferior em arcos Classe I de Kennedy e pr?tese total superior, reabilitados no Departamento de Odontologia da Universidade Federal do Rio Grande do Norte (UFRN). Os pacientes foram acompanhados por meio de controles peri?dicos nos per?odos de 60 dias, 6 meses e 1 ano desde a instala??o. Ap?s o primeiro ano de controle os demais retornos tiveram periodicidade anual. A ocorr?ncia de complica??es ou falhas prot?ticas foi observada e registrada em ficha cl?nica espec?fica ao longo de 39 meses. Os padr?es de falhas observados foram enquadrados nas seguintes situa??es: ocorr?ncia de ?lceras traum?ticas depois de 2 meses de instala??o, aus?ncia de reten??o, fratura de nicho ou c?rie sob o nicho, fratura ou descolamento dos dentes artificiais, fratura do conector maior, fratura de grampo, fratura do apoio, suporte deficiente (necessidade de reembasamento da pr?tese) e fratura da pr?tese. Resultados: A ocorr?ncia de complica??es apresentou baixa frequ?ncia, sendo maior a partir do segundo ano de uso da pr?tese. Dentre as complica??es que mais aconteceram est? a perda de reten??o (31,57%). Falhas de maior gravidade e de dif?cil resolu??o como a fratura de elementos da estrutura met?lica da PPR tiveram baixa ocorr?ncia e foram representadas por apenas um caso de fratura do conector maior (5,3%). Conclus?o: Pr?teses parciais remov?veis de extremidade livre mandibulares opostas a pr?teses totais convencionais apresentam baixo ?ndice de complica??es ap?s 39 meses de uso quando submetidas a controles peri?dicos
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Dias, K?ssia de Carvalho. "An?lise comparativa na influ?ncia da t?cnica de moldagem funcional em arcos parcialmente ed?ntulos sobre os pontos de contato oclusais, a integridade da fibromucosa e a extens?o da base da pr?tese." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17803.

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There is a lack of clinical studies evaluating techniques of functional impression for partially edentulous arches. The aim of this double-blind non-randomized controlled clinical trial was to compare the efficacy of altered cast impression (ACI) and direct functional impression (DFI) techniques. The efficacy was evaluated regarding the number of occlusal units on denture teeth, mucosa integrity at 24-hour follow-up and denture base extension. The sample included 51 patients (female and male) with mean age of 58.96 years treated at Dental Department of UFRN. The patients, exhibiting edentulous maxilla and mandibular Kennedy class I, were divided into two groups (group ACI, n=29; group DFI, n=22). Clinical evaluation was based on the number of occlusal units on natural and/or artificial teeth, mucosa integrity at 24-hour follow-up, and denture base extension. Statistical analysis was conducted using the software SPSS 17.0? (SPSS Inc., Chicago, Illinois). Student T-test was used to reveal association between number of occlusal units and impression technique while chi-square test showed association between mucosa integrity and impression technique. Fischer s exact test was applied for association between denture base extension and impression technique at 95% level of significance. No significant difference was observed between the groups regarding number of occlusal units, mucosa integrity and denture base extension. The altered cast technique did not provide significant improvement in comparison to the direct technique when the number of occlusal units, mucosa integrity and denture base extension
A literatura cient?fica ? carente de estudos cl?nicos que avaliem a efici?ncia de t?cnicas de moldagem funcional para arcos parcialmente desdentados. Objetivou-se realizar um ensaio cl?nico controlado, n?o randomizado e duplo-cego, para comparar a efici?ncia da t?cnica de moldagem funcional do modelo alterado (TMMA) com a t?cnica de moldagem funcional direta (TMD), em rela??o ao n?mero de pontos de contato oclusais por unidade oclusal na instala??o de novas pr?teses, a integridade da fibromucosa na sess?o de controle de 24 horas e a extens?o da base de pr?tese. A amostra foi constitu?da por 51 pacientes, com m?dia de idade de 58,96 anos, portadores de arco maxilar totalmente desdentado e Classe I de Kennedy mandibular, de ambos os sexos, reabilitados nas cl?nicas do Departamento de Odontologia da Universidade Federal do Rio Grande do Norte. Os pacientes foram divididos em dois grupos: grupo TMMA (n=29) e Grupo TMD (n=22). As seguintes vari?veis foram utilizadas para as medidas cl?nicas: n?mero de pontos de contato oclusais por unidade oclusal, a integridade da fibromucosa no retorno programado de 24 horas e a extens?o da base da pr?tese. Para an?lise estat?stica, utilizou-se o programa SPSS 17.0? (SPSS Inc., Chicago, Illinois) e aplicou-se o teste t de Student para verificar a associa??o do n?mero de pontos de contato oclusais por unidade oclusal em dentes naturais e artificiais e a t?cnica de moldagem. Para verificar a associa??o entre a integridade da fibromucosa e a t?cnica, foi utilizado o teste quiquadrado. O teste exato de Fisher foi usado para verificar a associa??o entre a extens?o da base da pr?tese e a t?cnica, com confian?a estat?stica de 95%. N?o existiu diferen?a estatisticamente significativa entre os dois grupos quanto ? t?cnica de moldagem em rela??o ao n?mero de pontos de contato oclusais, ? integridade da fibromucosa e ? extens?o da base da pr?tese. A t?cnica de moldagem funcional do modelo alterado n?o oferece vantagens significativas, quando comparada ? t?cnica direta, em rela??o ? quantidade de n?mero de pontos de contato oclusais por unidade oclusal, ? integridade da fibromucosa e ? extens?o da base da pr?tese
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Powers, Michael P. "A prospective study of edentulous patients with mandibular atrophy reconstructed with the transmandibular implant system a thesis submitted in partial fulfillment ... oral and maxillofacial surgery /." 1987. http://books.google.com/books?id=kkc_AAAAMAAJ.

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Chen, Kuan Wei, and 陳冠偉. "An Analysis of the Implant-supported Overdentures in the Edentulous Mandible." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39448574734957020396.

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碩士
長庚大學
顱顏口腔醫學研究所
99
The implant-supported overdenture can provide an alternative for the conventional complete denture prosthesis in the edentulous patient. This prosthesis, combined with various attachment designs, may achieve a satisfactory chewing improvement for patients. This investigation examined the cumulative survival rate of the implant-supported overdenture used with two types of attachments in patients treated at Show Chwan Memorial Hospital Implant Center from 1992 to 2006. Fifty-one patients (30 male and 21 female) were treated with mandibular implant-supported overdentures. Attachment systems used were the Hader bar with bilateral ERA attachments (Group A, 31 patients; 15 male, 16 female) and the Hader bar with bilateral distal extended cantilevers (Group B, 20 patients; 15 male, 5 female). A total of 219 implants were placed in the anterior mandibles of 51 patients. Of these, 204 implants remained at the end point of follow-up period. Among the failed implants, 66.7% (10/15) were in Group A, whereas 33.3% (5/15) were in Group B. Sixty percent (9/15) of failed fixtures were installed in the distal region and 40.0% (6/15) were installed in the middle region. Survival was also examined with respect to condition of the opposing arch. Patients wearing a maxillary removable partial denture had the highest implant failure rate (5/51=9.8%), whereas the failure rate of the complete denture group was only 5.7%. The most frequent complication noted was wear of ERAs/clips (n=56). Eight patients experienced ERA fracture and one experienced distal extended cantilever fracture. This study demonstrated that the implant-supported overdenture can be an effective and reliable alternative to the conventional complete denture. Fewer prosthetic complications were seen in dentures retained with distal extended cantilever attachments.
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14

Ku, Shau-Tung, and 顧紹彤. "Bone Stress Analysis in "All-on-Four" Implantation for Completely Edentulous Mandibles." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14835142303720459789.

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碩士
國立臺灣大學
機械工程學研究所
104
The aim of this thesis is to evaluate the von Mises stress in the peri-implant bone of an “All-on-four” implant supported prosthesis through finite element analysis using different types of bone, implant types, posterior implant angle and implant lengths under three kinds of mastication force.   “All-on-four” is a kind of implant protocol that inserts four implants between the mental foramina in placing a fixed prosthesis on an edentulous mandible. However, different treatment alternatives with various implant designs and surrounding conditions were performed in an edentulous mandible. Two 3D models of a human edentulous mandible were generated by CT scanner, one representing slight atrophy and the other representing moderate atrophy. Each mandibular bone has two bone types showing different biomechanical features, based on various patients physiological and pathological conditions. Two types of implant: NobelActive and NobelSpeedy with three different lengths (long/medium/short) were used. The two anterior implants were inserted in a parallel manner and the two distal implants were placed axially or tilted 30 degrees in each model. Three loading conditions (55 N / lateral incisor, 65 N / canine and 150 N / left second molar) were considered, and von Mises stress values in the peri-implant bone were determined.   Based on information and the stress distribution from finite element analysis of prosthesis supported by four implants, we are able to offer clinical dentists and patients suggestions regarding which kind of implant protocol may be more favorable under differing patients’ conditions, so as to avoid potential bone resorption, which may then facilitate bone deterioration during the treatment.
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15

Sá, Andrea de Castro Saldanha Valporto de. "Protocolo Inferior com carregamento imediato na região anterior da mandíbula." Master's thesis, 2018. http://hdl.handle.net/10284/7173.

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Abstract:
Esta revisão bibliográfica tem como objetivo abordar o desenvolvimento da carga imediata sobre implantes osseointegráveis na região anterior da mandíbula, identificando os fundamentos básicos para a osseointegração e as vantagens do protocolo de uma única fase cirúrgica. Para o alcance da osseointegração, requisitos básicos são fundamentais, como adequada seleção de pacientes, a precisão da técnica cirúrgica, número e design dos implantes, a estabilidade primária, união rígida dos implantes, o controle dos micromovimentos, a instalação passiva da prótese e uma oclusão bem definida. Foi possível concluir, baseado nos estudos encontrados, que existem altas taxas de sucesso nos resultados do tratamento do edentulismo total, na técnica de carga imediata, sendo observado diversas vantagens como função mastigatória imediata, redução de custos e tempo de tratamento, possibilitando maior rapidez na reabilitação oral e devolvendo melhores condições psicossociais aos pacientes.
This literature review aims to address the development of immediate loading on osseointegrative implants in the anterior region of the mandible, identifying the basic fundamentals for osseointegration and the advantages of a single surgical phase protocol. In order to achieve osseointegration, basic requirements are essential, such as adequate patient selection, surgical technique precision, number and design of implants, primary stability, rigid union of implants, control of micromovements, passive prosthesis installation and a well-defined occlusion. It was possible to conclude, based on the studies found, that there are high success rates in the results of total edentulism treatment, in the immediate loading technique, with several advantages being observed such as immediate masticatory function, reduction of costs and time of treatment, oral rehabilitation and returning better psychosocial conditions to patients.
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