Academic literature on the topic 'Implants'
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Journal articles on the topic "Implants"
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Sampaio, Verônica Porto Ramos, Diego Filipe Bezerra Silva, Flávio Marcel Pereira Barreiro, Hiarles Barreto Sampaio Brito, Francisco Juliherme Pires de Andrade, and Daliana Queiroga de Castro Gomes. "Implante imediato associado a enxerto xenógeno e provisionalização imediata em área infectada: relato de caso." ARCHIVES OF HEALTH INVESTIGATION 9, no. 5 (2020): 444–48. http://dx.doi.org/10.21270/archi.v9i5.4784.
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Introdução: A reabilitação com implantes dentários tornou-se possível de forma imediata a partir do conhecimento e aplicação da osseointegração. Esse procedimento propicia otimização entre o tempo de osseointegração e maturação óssea, além de minimizar a reabsorção alveolar, preservar a arquitetura gengival, e evitar novo procedimento cirúrgico. Objetivo: Evidenciar o sucesso de implante dentário unitário, instalado imediatamente após exodontia e curetagem de lesão periapical extensa, e a instalação da prótese com proservação de 33 meses. Relato do caso: Paciente do sexo feminino, 24 anos de idade, apresentou-se com uma parúlide na gengiva inserida acima do dente 25 e fratura coronal do mesmo. A tomografia computadorizada de feixe cônico (TCFC) revelou uma extensa área hipodensa na região do ápice da raiz do dente 25, medindo 6,7 X 8,2 mm. A referida lesão já havia causado fenestração da parede vestibular, cerca de dois terços no sentido ápice-coroa. Foi instituído como plano de tratamento a instalação de implante dentário imediato com carga imediata. A prótese final foi instalada 13 meses após a instalação do implante. Decorridos 17 meses do procedimento cirúrgico, foi solicitada radiografia periapical de controle, onde foi possível avaliar trabeculado ósseo sadio em torno do implante. Conclusão: Tendo em vista o avanço dos biomateriais utilizados em reabilitação oral e o aprimoramento das técnicas e profissionais que a desempenham, conclui-se que é possível realizar implantes imediatos e reabilitação imediata em área infectada, mesmo em casos limítrofes, com segurança e efetividade, possibilitando a obtenção de resultado final satisfatório.Descritores: Implantes Dentários; Infecção; Regeneração Óssea.ReferênciasBrånemark PI, Adell R, Breine U, Hansson BO, Lindström J, Ohlsson A. Intra-osseous anchorage of dental prostheses. I. Experimental studies. Scand J Plast Reconstr Surg. 1969;3(2):81-100.Rosenquist B, Grenthe B. Immediate placement of implants into extraction sockets: implant survival. Int J Oral Maxillofac Implants. 1996;11(2):205-9.Peñarrocha M, Uribe R, Balaguer J. Immediate implants after extraction. A review of the current situation. Med Oral. 2004;9(3):234-42.Brånemark PI. Branemark Novum: protocolo para reabilitação bucal com carga imediata (same-day teeth): uma perspectiva global. São Paulo: Quintessence; 2001.Carlsson GE, Bergman B, Hedegård B. Changes in contour of the maxillary alveolar process under immediate dentures. A longitudinal clinical and x-ray cephalometric study covering 5 years. Acta Odontol Scand. 1967;25(1):45-75.Novaes AB Jr, Vidigal Júnior GM, Novaes AB, Grisi MF, Polloni S, Rosa A. Immediate implants placed into infected sites: a histomorphometric study in dogs. Int J Oral Maxillofac Implants. 1998;13(3):422-7.Misch CE. Implantes dentários contemporâneos. 2ªed. São Paulo: Santos; 2000.Jensen T, Schou S, Stavropoulos A, Terheyden H, Holmstrup P. Maxillary sinus floor augmentation with Bio-Oss or Bio-Oss mixed with autogenous bone as graft: a systematic review. Clin Oral Implants Res. 2012;23(3):263-73.Müller A, Silva ACBR, Schimidt LTH. Implante unitário submetido à carga imediata. RGO (Porto Alegre). 2004;52(1):27-30.de Oliveira AC, de Souza JR, Thomé G, Melo ACM, Sartori IAM. Implante imediato unitário em função imediata – relato de caso. RFO. 2008;13(1):70-4.Carvalho PFM, Ciotti DL, Silva RC, Joly JC. Implantação e temporização imediata em áreas estéticas, sem abertura de retalho, utilizando implantes de diâmetro reduzido: Relato de caso clínico. Rev ImplantNews. 2008;5(8):307-12.Ferreira LCP, Brito CR, Lehn CN, Siqueira JTT. Avaliação de implantes osseointegráveis submetidos à função imediata comparados à função tardia. Rev ImplantNews. 2010;7(1):13-20.Tazima MFGS, Vicente YAMVA, Moriya T. Biologia da ferida e cicatrização. Medicina (Ribeirão Preto) 2008;41(3):259-64.Thomé G, Borges AFS, Melo ACM, Bassi APF, Sartori IAM, Faot F. Implante imediato em local cronicamente infectado: avaliação após 12 meses. RGO (Porto Alegre). 2007;55(4):417-21.Salmen FS, Oliveira MR, Gabrielli MAC, Piveta ACG, Pereira Filho VA, Gabrielli MFR. Enxerto ósseo para reconstrução óssea alveolar. Revisão de 166 casos. Rev Col Bras Cir. 2017;44(1):33-40.Brånemark PI. Protesis tejido integradas: la osseointegración en la odontologia clínica. Berlim: Quintessence; 1987.Nunes PA, Medeiros MM, Soder MV, Klein ALL, Hasse PN, Pfau EA. Implante e provisionalização imediata com resina composta em area estética. Arq Ciênc Saúde UNIPAR. 2014;18(1):65-8.Ruskin JD, Morton D, Karayazgan B, Amir J. Failed root canals: the case for extraction and immediate implant placement. J Oral Maxillofac Surg. 2005;63(6):829-31.Esposito M, Grusovin MG, Polyzos IP, Felice P, Worthington HV. Interventions for replacing missing teeth: dental implants in fresh extraction sockets (immediate, immediate-delayed and delayed implants). Cochrane Database Syst Rev. 2010;(9):CD005968.Buser D, Mericske-Stern R, Bernard JP, Behneke A, Behneke N, Hirt HP, Belser UC, Lang NP. Long-term evaluation of non-submerged ITI implants. Part 1: 8-year life table analysis of a prospective multi-center study with 2359 implants. Clin Oral Implants Res. 1997;8(3):161-72.Sousa MAF. Considerações relativas à colocação imediata de implantes em alvéolos pós-extração. Artigo de Revisão Bibliográfica Mestrado Integrado em Medicina Dentária. Faculdade de Medicina Dentária, Universidade do Porto, 2014.Chaushu G, Chaushu S, Tzohar A, Dayan D. Immediate loading of single-tooth implants: immediate versus non-immediate implantation. A clinical report. Int J Oral Maxillofac Implants. 2001;16(2):267-72.Lorenzoni M, Pertl C, Zhang K, Wimmer G, Wegscheider WA. Immediate loading of single-tooth implants in the anterior maxilla. Preliminary results after one year. Clin Oral Implants Res. 2003;14(2):180-87.Galli F, Capelli M, Zuffetti F, Testori T, Esposito M. Immediate non-occlusal vs. early loading of dental implants in partially edentulous patients: a multicentre randomized clinical trial. Peri-implant bone and soft-tissue levels. Clin Oral Implants Res. 2008;19(6):546-52.
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Singh, Ajit. "DENTAL IMPLANT DESIGN- AN INSIGHT OVERVIEW." Journal of Medical pharmaceutical and allied sciences 10, no. 4 (2021): 3101–5. http://dx.doi.org/10.22270/jmpas.v10i4.1254.
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Dental implants are a proven therapeutic option for replacing missing teeth, with positive long-term health outcomes. Dental implant performance is largely determined by the implant’s primary durability, which is affected by surgical procedure, bone quality and quantity, implant surface characteristics, implant geometry, and implant surface characteristics. The implant’s geometry and surface can be modified. The implant geometry and surface can be changed if needed to achieve good primary stability and long-term implant therapy effectiveness. Implant architecture refers to the implant’s three-dimensional structure, as well as all of the components and elements that make it up. Different surface topographies can affect a sequence of coordinated actions such cell proliferation, osteoblast transformation, and the production of bone tissue. At the macro, micro, and increasingly nano sizes, surface topography of implants may be detected. The surgical location of end osseous oral implants is influenced by the prosthetic architecture, as well as the shape and quality of the alveolar bone. There are several alternatives for replacing missing teeth, but within the past few decades, dental implants have been one of the most common biomaterials for replacing one (or more) missing teeth. In a substantial number of patients, titanium dental implants have been shown to be secure and reliable. This study examines the most important historical information of dental implants, as well as the various vital factors that will ensure successful Osseo-integration and a safe prosthesis anchorage. Not only
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Leite, Andressa Rosa Perin, Danny Omar Mendoza Marin, Gabriela Giro, Ana Carolina Pero, Ligia Antunes Pereira Pinelli, and José Maurício dos Santos Nunes Reis. "Custom Cast Ball Attachments Used on Outdated Implants to Restore a Maxillary Implant-Supported Overdenture." Journal of Oral Implantology 43, no. 4 (2017): 297–301. http://dx.doi.org/10.1563/aaid-joi-d-16-00156.
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The lack of compatible prosthetic components can be a complication during oral rehabilitation using outdated implants. The aim of the present clinical report was to describe an alternative technique for the fabrication of a maxillary implant-supported overdenture in a patient with 20-year-old dental implants using castable spherical patterns and ball attachments. The patient had been wearing a relined bar/clip overdenture in the mandible on 4 external-hexagon dental implants and a relined complete denture in the maxilla on 4 internal-hexagon implants due to abutment screw fracture inside of the implants, losing the attachment system. The remaining maxillary dental implants did not possess attachments compatible with current systems due to configuration changes by the manufacturer in the dental implant's platform and the components over time. Therefore, castable spherical patterns and cast ball attachments were used to fabricate a maxillary implant-supported overdenture. The mandible rehabilitation was performed using 4 osseointegrated dental implants with a fixed implant-supported prosthesis. The use of cast ball attachments on the maxillary dental implants avoided invasive procedures on the remaining implants. Considering the lack of available compatible prosthetic components for the osseointegrated implants, this technique was considered a viable and satisfactory treatment option.
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Kheder, Waad, Amal Bouzid, Thenmozhi Venkatachalam, et al. "Titanium Particles Modulate Lymphocyte and Macrophage Polarization in Peri-Implant Gingival Tissues." International Journal of Molecular Sciences 24, no. 14 (2023): 11644. http://dx.doi.org/10.3390/ijms241411644.
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Titanium dental implants are one of the modalities to replace missing teeth. The release of titanium particles from the implant’s surface may modulate the immune cells, resulting in implant failure. However, little is known about the immune microenvironment that plays a role in peri-implant inflammation as a consequence of titanium particles. In this study, the peri-implant gingival tissues were collected from patients with failed implants, successful implants and no implants, and then a whole transcriptome analysis was performed. The gene set enrichment analysis confirmed that macrophage M1/M2 polarization and lymphocyte proliferation were differentially expressed between the study groups. The functional clustering and pathway analysis of the differentially expressed genes between the failed implants and successful implants versus no implants revealed that the immune response pathways were the most common in both comparisons, implying the critical role of infiltrating immune cells in the peri-implant tissues. The H&E and IHC staining confirmed the presence of titanium particles and immune cells in the tissue samples, with an increase in the infiltration of lymphocytes and macrophages in the failed implant samples. The in vitro validation showed a significant increase in the level of IL-1β, IL-8 and IL-18 expression by macrophages. Our findings showed evidence that titanium particles modulate lymphocyte and macrophage polarization in peri-implant gingival tissues, which can help in the understanding of the imbalance in osteoblast–osteoclast activity and failure of dental implant osseointegration.
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Vishwakarma, Vinita, Gobi Saravanan Kaliaraj, and Kamalan Kirubaharan Amirtharaj Mosas. "Multifunctional Coatings on Implant Materials—A Systematic Review of the Current Scenario." Coatings 13, no. 1 (2022): 69. http://dx.doi.org/10.3390/coatings13010069.
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The challenges and demands of implant materials are changing as a result of the substantial expansion in the global population. Suitable implants are required for aged people, physical injuries, patients who need revised surgeries, contaminated implants, and accident victims. Hence, the requirement for implants is drastically increasing day by day. Metals, ceramics, and polymers are used as implant materials by biomedical industries for long-term suffering patients. Stainless steel, titanium and its alloys, aluminum alloys, cobalt, zirconium, etc. (metals), hydroxyapatite (ceramic), polyurethane, polyethylene, polyimide, etc. (polymers), are some of the examples that fulfill the implant requirements. There are many other obstructions, such as adhesion, inflammation, and bacterial attack, which minimize the implant’s performance and its activity. However, coatings on ideal implant materials are significant to avoid its failure and to enhance its durability and longevity. Advanced techniques, such as physical and chemical methods, are suitable coating approaches to promote the surface of implants with respect to mechanical, biological, and other multifunctional activities. This review paper focuses on and investigates several strategies for bioactive implants’ coatings, analysis, and emerging applications for biomedical industries.
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Sant'Anna Falce de Macedo, Bruno Eduardo, Rafael Manfro, Patrícia Tolentino da Rosa de Souza, Maurício Rosa, Gislaine Fernandes Felipe Garcia, and Nayara Flores Macedo. "Evaluation of the Primary Stability of 73 Implants with a New Macrogeometry in the Treatment of the Edentulous Maxilla by the All-on-Four Technique." Journal of Orofacial Sciences 16, no. 2 (2024): 105–10. https://doi.org/10.4103/jofs.jofs_340_23.
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Introduction: Primary stability depends on factors such as bone quality and availability, surgical technique, implant microgeometry and is decisive to load implants immediately or wait for their osseointegration period. The implants used in this study (Implantes Maestro Implacil de Bortoli − São Paulo, SP, Brazil) have a conical shape with decompression chambers that increase the implant and bone contact area and reduce the implant insertion torque without affecting the primary stability. Evaluate the primary stability of 73 implants subjected to immediate loading and correlating this result with implant diameter and length. A cross-sectional clinical study. Methods and Material: Twenty one patients were selected clinically and by imaging with cone bean computed tomography. The implants were installed up to a torque of 35 N cm, measured at the end of the fixture installation. Statistical analysis used: Spearman’s correlation analysis and Mann–Whitney U test analysis, both with 5% significance. Results: The values obtained were 51.51 N cm for the 3.5 mm implants and 59.50 N cm for the 4.0 mm implants. These values were statistically significantly in favor of the 4.0 mm implants (P = 0.03). There was no statistically significant difference (P = 0.373) between the variation of the primary stability of the implants in relation to their length. Conclusions: Implants with larger diameter tend to have a greater primary stability, all of them showed average primary stability when sub-instrumented to perform immediate loading.
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Shosheva, Olesya, Mikhail Zhmaylo, Leonid Maslov, et al. "Comparative analysis of lumbar spine reconstruction using implants made of homogeneous PEEK and lattice titanium." Russian journal of biomechanics. 29, no. 1 (2025): 53–73. https://doi.org/10.15593/rjbiomech/2025.1.04.
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Despite significant advances in neurosurgery, stable spinal reconstruction after total en bloc spondylectomy (TES) remains a challenge. This procedure standardly consists of replacing the vertebra with an implant and performing transpedicular fixation. However, standard serial implants do not always provide sufficient support and adequate load distribution, increasing the risks of instability, deformations and subsidence of the implant. It is therefore crucial to develop customized implants based on additive technologies. Three different implants were examined in this study: two polymeric implants made of homogeneous polyetheretherketone (PEEK) with posterior and lateral fixation and an additively manufactured implant made of titanium-based lattice meta-biomaterial with lateral fixation. Calculations of the stress–strain state of the reconstructed spine were performed for each of them for six basic actions: flexion, extension, right bending, left bending, right rotation and left rotation. Our findings indicate that the polymeric implant with posterior fixation might be the best candidate of all the implants considered, inducing the lowest stresses in bony endplates. Additionally, this type of implant ensures the stability of transpedicular fixation. On the other hand, while the metamaterial implant also offers certain advantages, the technique for anchoring the implant to the vertebrae should be further refined to prevent the implant's deformation and loosening.
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Zhang, Salina, Pelin Batur, Charles Martin, and Paul Rochon. "Contraceptive Implant Migration and Removal by Interventional Radiology." Seminars in Interventional Radiology 35, no. 01 (2018): 023–28. http://dx.doi.org/10.1055/s-0038-1636517.
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AbstractAs the reversible contraceptive arm implants grow more popular, there is an increasing need to recognize the complications resulting from implant migration and removal. This review summarizes the findings of imaging and removal methods. When an implant is lost, the axillary region should be investigated first. If the implant still cannot be found, visualization though different methods have been employed for non-radiopaque implants. Real-time fluoroscopic-guided localization and removal can be accomplished for radiopaque Nexplanon. Once the implant has been located, standard removal method and other modified techniques can be used to safely remove the implant depending on the implant's location.
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Di Lorenzo, Matteo, Andrea Torsani, Paolo Tonveronachi, Samuele Baruch, and Christian Caldari. "Risk factors for early implant failure: a retrospective-multicentric study of 2323 implants in screw retained fixed full arch rehabilitation." Journal of Oral Medicine and Oral Surgery 29, no. 2 (2023): 24. http://dx.doi.org/10.1051/mbcb/2023022.
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Objectives: The aim of this retrospective study was to investigate possible risk factors for early implant failure in screw retained fixed full-arch rehabilitation. Methods: data of 487 patients (2323 implants) treated with full-arch rehabilitation supported by same implants brand were collected for the time period from 2017 to 2020 and examined to evaluate early implants failure rates. The following data were collected for statistical analysis: sex, age, health disorders (diabetes and hypertension) and bad habit (smoke) of the patient, location of the implant (maxilla or mandible, anterior or posterior site), type of implant's healing and bone regeneration procedures. Chi-squared test, bivariate comparison analysis and univariate mixed model analysis were used to estimate the effect of both patient-related and implant related variables on early implant failure as a potential risk factors. Results: 487 patients were included, 218 females (62.3 ± 9.14 of age) and 269 males (62.8 ± 10.11 of age) in 30 private institutions for a total of 2323 implants placed and a total of 526 screw retained fixed full arch rehabilitation. A total of 40 out of 2323 (1.7%) implants failed prematurely within 1 year, 32 in the maxilla 8 in the mandible. Bivariate comparison analysis and univariate mixed model analysis showed that female patient, implant placed in maxilla, age <61 years and submerged healed implants showed a statistically significant higher failure rate among the risk factors considered. Conclusions: Implants placed in the upper jaw and their modality of healing seems to be associated with a higher risk of early implant failure.
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Brandon, Harold J., Larry S. Nichter, and Dwight D. Back. "New Evaluation Procedure for Multi-Dimensional Mechanical Strains and Tangent Moduli of Breast Implants: IDEAL IMPLANT® Structured Breast Implant Compared to Silicone Gel Implants." Bioengineering 6, no. 2 (2019): 43. http://dx.doi.org/10.3390/bioengineering6020043.
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The IDEAL IMPLANT® Structured Breast Implant is a dual lumen saline-filled implant with capsular contracture and deflation/rupture rates much lower than single-lumen silicone gel-filled implants. To better understand the implant’s mechanical properties and to provide a potential explanation for these eight-year clinical results, a novel approach to compressive load testing was employed. Multi-dimensional strains and tangent moduli, metrics describing the shape stability of the total implant, were derived from the experimental load and platen spacing data. The IDEAL IMPLANT was found to have projection, diametric, and areal strains that were generally less than silicone gel implants, and tangent moduli that were generally greater than silicone gel implants. Despite having a relatively inviscid saline fill, the IDEAL IMPLANT was found to be more shape stable compared to gel implants, which implies potentially less interaction with the capsule wall when the implant is subjected to compressive loads. Under compressive loads, the shape stability of a higher cross-link density, cohesive gel implant was unexpectedly found to be similar to or the same as a gel implant. In localized diametric compression testing, the IDEAL IMPLANT was found to have a palpability similar to a gel implant, but softer than a cohesive gel implant.
Dissertations / Theses on the topic "Implants"
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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.
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antenucci_rmf_dr_araca.pdf: 994627 bytes, checksum: 0fe6227d507931e16135dd308b4ca65c (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>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...<br>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)
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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.
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aguiar_jrpj_dr_araca.pdf: 843042 bytes, checksum: f640ef7de226d005134afbe1456c4ddf (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>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...<br>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)
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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/.
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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.<br>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.
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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.
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basilio_ma_me_arafo.pdf: 801760 bytes, checksum: 7941402e0f93534f3eda18455ce01460 (MD5)<br>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.<br>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.
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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.
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almeida_daf_me_araca.pdf: 686399 bytes, checksum: 50ad249856d1640af8c25dd2dcb4adb5 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>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...<br>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)
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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/.
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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.<br>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.
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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.
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Orientador: Eduardo Piza Pellizzer<br>Coorientador: Pedro Yoshito Noritomi<br>Banca: Paulo Sérgio Perri de Carvalho<br>Banca: Fellippo Ramos Verri<br>Banca: Marcelo Ferraz Mesquita<br>Banca: Pedro Tortamano Neto<br>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)<br>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)<br>Doutor
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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.
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santiagojunior_jf_me_araca.pdf: 4599975 bytes, checksum: efdcd7bb205ee8146a6d5463f80ff100 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>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...<br>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)
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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.
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Orientador: Rafael Leonardo Xediek Consani<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-19T19:18:16Z (GMT). No. of bitstreams: 1
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Previous issue date: 2012<br>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<br>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<br>Mestrado<br>Protese Dental<br>Mestre em Clínica Odontológica
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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/.
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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.<br>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.
Books on the topic "Implants"
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Shanidze, Mikhail. Implanty i grin-karta: Implants and green-card. Liberty Publishing House, 2015.
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Tomasetti, Boyd J., and Rolf Ewers, eds. Short Implants. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44199-9.
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Chow, James, ed. Zygomatic Implants. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29264-5.
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Miller, Josef M., and Francis A. Spelman, eds. Cochlear Implants. Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4612-3256-8.
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Clark, Graeme, ed. Cochlear Implants. Springer-Verlag, 2003. http://dx.doi.org/10.1007/b97263.
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B, Waltzman Susan, and Roland J. Thomas, eds. Cochlear implants. 2nd ed. Thieme, 2006.
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Symposium C on Deep Implants: Fundamentals and Applications (1988 Strasbourg, France). Deep implants. North Holland, 1989.
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Johns, R. B. Dental implants. Audio Visual and Television Centre, University of Sheffield, 1988.
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National Institutes of Health (U.S.), ed. Dental implants. U.S. Dept. of Health and Human Services, Public Health Service, National Institutes of Health, 1988.
Find full textBook chapters on the topic "Implants"
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Drago, Carl. "Implants and Implant Restorative Components." In Implant Restorations. John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119136187.ch2.
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Bonner, Justin. "Zygomatic Implants in Implant Dentistry." In Innovative Perspectives in Oral and Maxillofacial Surgery. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75750-2_26.
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Dy, Geolani W., Ian T. Nolan, Nabeel A. Shakir, and Lee C. Zhao. "Prosthetics: Erectile Implant, Testicular Implants." In Urological Care for the Transgender Patient. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-18533-6_12.
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Gonzalez, Shawneen M. "Implants." In Interpretation Basics of Cone Beam Computed Tomography. John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119421177.ch9.
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Pacifico, Marc. "Implants." In Oncoplastic Breast Surgery. CRC Press, 2022. http://dx.doi.org/10.1201/9781315115146-73.
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Chow, Lucy, Mikhail Roubakha, Puja Shahrouki, and Bo Li. "Implants." In Absolute Breast Imaging Review. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08274-0_9.
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Ghanem, Elie, Javad Parvizi, and Brian A. Klatt. "Implants." In Essentials in Total Hip Arthroplasty. CRC Press, 2024. http://dx.doi.org/10.1201/9781003524014-17.
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Bozkurt, Duygu. "Effects of Diabetes Mellitus on Dental Implants." In Current Perspective on Diabetes Mellitus in Clinical Sciences. Nobel Tip Kitabevleri, 2023. http://dx.doi.org/10.69860/nobel.9786053359111.42.
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Diabetes mellitus (DM) poses significant challenges in the context of dental implants due to its potential impact on oral health and healing processes. Individuals with diabetes are more prone to complications such as delayed wound healing, increased risk of infection, and impaired bone metabolism, all of which can adversely affect the success of dental implant procedures. Hyperglycemia in diabetes can compromise the immune response, making patients more susceptible to infections around implant sites. Moreover, poorly controlled diabetes can lead to reduced bone density and impaired osseointegration, the process by which implants fuse with the jawbone. Management of diabetes, including glycemic control and comprehensive pre-operative assessment, is crucial to minimize these risks. Close collaboration between dental professionals and endocrinologists is recommended to optimize outcomes for patients with diabetes undergoing dental implant treatment.
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Westerlund, Anna. "Orthodontic Implants and Orthodontic Implant Surfaces." In Implant Surfaces and their Biological and Clinical Impact. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45379-7_12.
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Ebenezer, Supriya, Vinay V. Kumar, and Andreas Thor. "Basics of Dental Implantology for the Oral Surgeon." In Oral and Maxillofacial Surgery for the Clinician. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-1346-6_18.
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AbstractOver the past decades, implant dentistry has evolved to be a very predictable treatment modality for the replacement of lost teeth and has now become one of the most common oral surgical procedures carried out worldwide. This chapter introduces the history and evolution of dental implants, discusses the concept of osseointegration, mentions the types of implants and discusses clinical decision making and execution of straight forward implant placement. It must be noted that the field of implantology is rapidly developing with new treatment concepts and increasing use of digital technology. The surgical part of implant treatment although extremely important, is only a part of the overall treatment, the other important factors being the laboratory and prosthodontics. This chapter only provides a basic surgical overview of implantology for the beginner surgeon clinician.
Conference papers on the topic "Implants"
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Gindri, Izabelle M., Maria Burbano, Danyal Siddiqui, Robert Russell, M. Laura Rodriguez, and Danieli C. Rodrigues. "Surface and Elemental Characterization of Failed Total Hip Implants." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-06058.
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Abstract Implant failure can be triggered by metal wear and corrosion in the articular interfaces as well in the modular sections of hip implants, which may induce inflammatory reactions. The goal of this study was to evaluate the surface characteristics related to wear and corrosion of eleven retrieved hip implants due to different clinical causes. Factors that evidenced wear and corrosion such as scratches, pits and discoloration were investigated to obtain information on potential root causes of implant failure. All surfaces showed some degree of wear. The most damaged surface, from a cobalt-chromium modular stem, was further investigated by X-Ray Photoelectron Spectroscopy (XPS) and electrochemical experiments. The surface of this sample showed titanium contamination, which was hypothesized as being released from other implant components due to wear and corrosion.
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Ben Hamu, Guy. "Patient-specific Orthopedic Implants Manufactured by Additive Manufacturing – a Corrosion Study." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09257.
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Abstract The increase in the world population and aging has resulted in a significant growth of orthopedic implant surgeries. Hip and knee replacement surgeries are one of the most common surgeries in the older population. Most of the joint replacements, implants, and bone plates are generic, mass-produced components, which may not always be compatible with patients having a specific or unusual anatomy. In these situations, custom designed implant components are required. Additive manufacturing finds its potential utilization for the manufacture of human bone implants. However, the deep understanding of mechanical, corrosion, and fatigue properties of additive manufactured implants is still lacking. The main objective of present research is to investigate the optimum part properties for two different additive manufacturing processes, selective laser melting (SLM) and electron beam melting (EBM), for their application to medical implants. The two processes were investigated regarding their effect on microstructure and corrosion behavior for biocompatible TiAl6V4 alloy.
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Weriono, Weriono, Hendery Dahlan, Eka Sahputra Roni, and Meifal Rusli. "A Finite Element Analysis of the Pedicle Screw Displacement on Spine Implant with Varying Frictional Contact." In International Conference on Experimental and Computational Mechanic in Engineering 2023. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-v7mvra.
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Displacement can occur for a variety of reasons, including pedicle screw detachment from the spine, damaged pedicle screws, the supporting rod detaching from the pedicle screw, and broken supporting rods. The relationship between displacement and screw threads indicates that the displacement of the screw is a measure of thread movement, and the smaller the pitch (the space between the two screw threads), the lower the displacement of the screw. Results from a normal bone simulation using MSC-Marc show that variations in pedicle screws under tensile load result in a displacement of 5.53x10-5 mm for single-threaded conical pedicle implants, with no greater coefficient of friction than single-threaded cylindrical implants, which have a displacement of 1.62x10-6 mm. When a tensile load is applied to an osteopenia bone, a single-threaded conical implant with no coefficient of friction results in a displacement of 3.45x10-5 mm as opposed to a cylindrical implant. The higher contact force reinforces the pedicle screw's interface with the bone, making it less likely to detach due to the pedicle screw's tensile force. When applying tensile forces and bending moments to a single-threaded conical implant with a single-threaded cylindrical implant, the displacement increases as the friction coefficient rises
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Stone, James J. S., Hongrong Yu, Ronald L. Linscheid, William P. Cooney, and Kai-Nan An. "Analysis of Finger PIP Implants." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43307.
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Total joint arthroplasty (TJA) is implemented primarily for the relief of pain, and secondarily for achieving better function by increasing the joint’s strength and motion. In order to keep health costs low, it is desirable that the TJA achieves and maintains a long-term and secure fixation of the implanted components. Unfortunately, clinical follow-up shows that the prosthetic finger implant components have long-term complications including bone resorption, wear, loosening, and failure of the implant components. Although the mechanism of complications is not fully understood, it is well known that the wear and failure of prostheses are highly related to the mechanical forces or stresses of implant components. It is therefore desirable that reliable 3-D computational finite element analysis (FEA) models can be developed and used for the stress analysis of implants. In this study, the finger proximal interphalangeal (PIP) prosthetic components were analyzed using a nonlinear finite element method. Implant components under different joint flexion angles as well as different forces were studied. The stress distribution on the contact surface of the implant component was obtained. The developed FEA models can be used to examine the contact situations (contact stress, contact region, and stress distribution), which are critical to the wear and potential failure of the implant components. Based on FEA results, the design of the current finger PIP implants can be improved for optimum performance and a long-term fixation.
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Mehboob, Hassan, Abdelhak Ouldyerou, Ali Mehboob, and Imad Barsoum. "Finite Element Analysis of Taper and Straight Porous Dental Implants." In ASME 2024 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2024. https://doi.org/10.1115/imece2024-142582.
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Abstract Conventional dental implants, typically made of dense titanium, exhibit mechanical properties significantly higher than cancellous and cortical bone, leading to stress shielding and potential implant failure. This study aims to evaluate porous and dense implants with tapered and straight designs using the finite element method. The implants were fully bonded with bone to mimic full osseointegration. A load of 200 N was applied to the crown to mimic the chewing forces. The results showed that the tapered porous implant experienced the highest stress in cancellous bone (6.50 MPa), while the straight dense implant recorded the lowest (3.57 MPa). Conversely, the straight dense implant exhibited maximum stress (181.60 MPa) compared to the porous tapered implant (13.07 MPa). However, straight-dense implants demonstrated a higher factor of safety relative to porous implants. Biomechanically, the porous tapered implant outperforms conventional implants and may mitigate associated complications.
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Gross, K. A., B. Ben-Nissan, W. R. Walsh, and E. Swarts. "Analysis of Retrieved Hydroxyapatite Coated Orthopaedic Implants." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1133.
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Abstract Hydroxyapatite (HA) coatings are used to improve the adhesion of bone onto implanted devices. This approach increases the integrity and hence the lifetime of the implant. Several orthopaedic appliances (HA coated and macrotextured) were recovered from patients after revision surgery. The implants were cleaned and sterilised in ethanol or formaldehyde before being photographed and sectioned for analysis. X-ray diffraction indicated that the remaining coating was of high crystallinity. Micro textured areas such as ribbings and fenestrations subjected the coating to different modes of stress which has affected the coating. Adhesive failure was evident on implants attributed to dissolution of the amorphous phase at the interface. Observation of the microstructure with scanning electron microscopy showed that coating degradation begins at the surface where the coating is resorbed and continues along the substrate-coating interface thereby compromising interface strength. The microstructure and the dissolution of retrieved implants are discussed in relation to the general coating features in plasma sprayed HA coatings.
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Gómez Pérez, Carlos A., Hugo I. Medellín-Castillo, and Raquel Espinosa-Castañeda. "Computer Assisted Design and Structural Topology Optimization of Customized Craniofacial Implants." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72219.
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Modern design and manufacturing engineering technologies have greatly improved the way in which modern craniofacial implants are designed and fabricated. However, few efforts have been made in order to optimize their design. While the weight of polymer-based implants (e.g. PMMA implants) may not affect the patient’s comfort, the higher weight of metal-based implants (e.g. titanium implants), could greatly affect the patient’s comfort, causing in some cases nuisances and imbalance problems. Thus, the optimization of the implant becomes relevant in order to guarantee its structural stiffness but with a reduced weight. In this paper, the design and structural optimization of customized craniofacial implants based on the use of modern engineering technologies is presented. The aim is to introduce an engineering methodology for the design and optimization of customized craniofacial implants. The methodology starts from the patient’s medical images, obtained from a computerized tomography (CT), which are processed to reconstruct the digital 3D model. Next, the geometrical design of the implant is carried out in a computer aided design (CAD) system using the patient’s 3D model. Then, the structural analysis of the implant is performed using the Finite Element Method (FEM) and considering a quasi-static load. The topology optimization of the implant is made using the Solid Isotropic Material Penalization (SIMP) method. Finally, the optimized customized implant is fabricated in an additive manufacturing (AM) system. A case study of a craniofacial implant is presented and the results reveal that the proposed methodology is an effective approach to design and optimize craniofacial implants.
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Hanks, Bradley, Shantanab Dinda, and Sanjay Joshi. "Redesign of the Femoral Stem for a Total Hip Arthroplasty for Additive Manufacturing." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85850.
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Total hip arthroplasty (THA) is an increasingly common procedure that replaces all or part of the hip joint. The average age of patients is decreasing, which in turn increases the need for more durable implants. Revisions in hip implants are frequently caused by three primary issues: femoral loading, poor fixation, and stress shielding. First, as the age of hip implant patients decreases, the hip implants are seeing increased loading, beyond what they were traditionally designed for. Second, traditional implants may have roughened surfaces but are not fully porous which would allow bone to grow in and through the implant. Third, traditional implants are too stiff, causing more load to be carried by the implant and shielding the bone from stress. Ultimately this stress shielding leads to bone resorption and implant loosening. Additive manufacturing (AM) presents a unique opportunity for enhanced performance by allowing for personalized medicine and increased functionality through geometrically complex parts. Much research has been devoted to how AM can be used to improve surgical implants through lattice structures. To date, the authors have found no studies that have performed a complete 3D lattice structure optimization in patient specific anatomy. This paper discusses the general design of an AM hip implant that is personalized for patient specific anatomy and proposes a workflow for optimizing a lattice structure within the implant. Using this design workflow, several lattice structured AM hip implants of various unit cell types are optimized. A solid hip implant is compared against the optimized hip implants. It appears the AM hip implant with a tetra lattice outperforms the other implant by reducing stiffness and allowing for greater bone ingrowth. Ultimately it was found that AM software still has many limitations associated with attempting complex optimizations with multiple materials in patient specific anatomy. Though software limitations prevented a full 3D optimization in patient specific anatomy, the challenges associated such an approach and limitations of the current software are discussed.
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Schulz, Mark J., Amos Doepke, Xuefei Guo, et al. "Responsive Biosensors for Biodegradable Magnesium Implants." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13101.
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A biosensor is an electronic device that measures biologically important parameters. An example is a sensor that measures the chemicals and materials released during corrosion of a biodegradable magnesium implant that impact surrounding cells, tissues and organs. A responsive biosensor is a biosensor that responds to its own measurements. An example is a sensor that measures the corrosion of an implant and automatically adjusts (slows down or speeds up) the corrosion rate. The University of Cincinnati, the University of Pittsburgh, North Carolina A&T State University, and the Hannover Medical Institute are collaborators in an NSF Engineering Research Center (ERC) for Revolutionizing Metallic Biomaterials (RBM). The center will use responsive sensors in experimental test beds to develop biodegradable magnesium implants. Our goal is to develop biodegradable implants that combine novel bioengineered materials based on magnesium alloys, miniature sensor devices that monitor and control the corrosion, and coatings that slow corrosion and release biological factors and drugs that will promote healing in surrounding tissues. Responsive biosensors will monitor what is happening at the interface between the implant and tissue to ensure that the implant is effective, biosafe, and provides appropriate strength while degrading. Corrosion behavior is a critical factor in the design of the implant. The corrosion behavior of implants will be studied using biosensors and through mathematical modeling. Design guidelines will be developed to predict the degradation rate of implants, and to predict and further study toxicity arising from corrosion products (i.e., Mg ion concentrations, pH levels, and hydrogen gas evolution). Knowing the corrosion rate will allow estimations to be made of implant strength and toxicity risk throughout the degradation process.
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Delgado, Daniel, Arturo A. Fuentes, Robert Jones, and Arnold Lumsdaine. "Quantitative Determination of the Stability of Implant-Bone Interface Using Resonance Frequency Analysis." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33490.
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It is important to have a quantitative method to establish a standard way to measure stability and osseointegration of implants. Among other benefits, these measurements would provide information leading to the prediction of healing time around the implant and the monitoring of the health of the implant’s interface. The dental industry has been looking for non-destructive methods to measure implant integration within the bone. In previous studies, resonance frequency analysis revealed a clear relationship between resonance frequency measurements and stiffness of the implant interface and the effective length of the implant. These studies have examined only one mode of vibration or have suffered from measurement difficulties. Furthermore, no study has evaluated the damping properties of the interface and surrounding tissues. This paper describes the development of an instrument capable of capturing and measuring information to characterize the process of dental implant osseointergration. The parameters needed to measure stability and osseointegration of implants are the stiffness of the implant components (which are a function of their geometry and material composition) and the stiffness and damping properties of the implant-bone interface and surrounding tissues. The instrument developed provides valuable information about the stiffness and damping properties of the implant-bone interface obtained through resonance frequency analysis with torsional, longitudinal and transverse vibration. Experimental, analytical, and finite element analysis results are presented.
Reports on the topic "Implants"
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Traczinski, Adriana, Felipe Carvalho de Macêdo, Ivete Aparecida de Mattias Sartori, and José Mauro Granjeiro. Advantages and limitations related to the rehabilitation of edentulous jaw with implant supported prostheses made of monolithic zirconia: systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.1.0111.
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Review question / Objective: P: edentulous maxillary arch; I: Full arch rehabilitation with monolithic zirconia or veneered prosthesis retained by implants; C: none; O: Biomechanical complications (framework fracture, chipping, complications, advantages, limitations); S: RCT, nor randomized clinical trials. Condition being studied: Biomechanical complications resulting from the oral rehabilitation of edentulous maxillary arch through the use of implant-supported full arc prostheses made of monolithic zirconia. Eligibility criteria: Total edentulous maxillary arch patients; rehabilitated with implants; monolithic zirconia prostheses with full contour or vestibular face with application of feldspathic ceramics or full veneered or with segmented zirconia crowns; the condition of the opposing arch must be described; the number of maxillary implants that support the prosthesis must be a minimum of 4 implants.
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McMillan, A. D., R. J. Lauf, B. Beale, and R. Johnson. Hydroxylapatite Otologic Implants. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/760360.
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López-Valverde, Nansi, Javier Aragoneses, Antonio López-Valverde, Cinthia Rodríguez, and Juan Manuel Aragoneses. Role in the osseointegration of titanium dental implants, of bioactive surfaces based on biomolecules: A systematic review and meta-analysis of in vivo studies. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.6.0076.
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Review question / Objective: Does the bioactive surface of titanium dental implants, based on biomolecules, influence osseointegration?. The aim of our study was to evaluate the role and efficacy of bioactive surfaces in osseointegration. Our review study limited the research interest to titanium dental implants coated with a biomolecule, i.e., an organic molecule produced by a living organism. Condition being studied: In recent years, much attention has been paid to topographical modifications of dental implant surfaces, as well as to their coating with biologically active substances.a bioactive surface is one capable of achieving faster and higher quality osseointegration, shortening waiting times and solving situations of poor bone quality. Molecules that can be applied for bioactive purposes include bioceramics, ions and biomolecules. Collagen and bone morphogenetic protein have been suggested as bone stimulating agents. Biofunctionalization of the implant surface with a biomimetic active peptide has also been shown to result in a significant increase in bone-to-implant ratios and an increase in peri-implant bone density.
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Chillara, Vamshi. Powering Implants Using Sound. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1369168.
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Vélez, Rómulo Andrés, Alejandro Fereño Caceres, Wilson Daniel Bravo Torres, Daniela Astudillo Rubio, and Jacinto José Alvarado Cordero. Primary stability with the osseodensification drilling technique for dental implants in low density bone in humans: a systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.9.0066.
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Review question / Objective: - Does the osseodensification drilling technique increase primary stability in low-density bone? - The aim of the present investigation was to evaluate primary stability in dental implants in people with low density bone using the osseodensification technique. Condition being studied: The replacement of missing teeth through dental implants is currently the most practiced in dental clinics. The main criterion for determining the success of an implant is osseointegration, which is a direct structural and functional connection between vital bone and the prosthetic load-bearing surface of an implant. In the same way, primary stability must be obtained for a good lasting clinical result of the implant and to achieve this purpose, the bone density must be evaluated where the dental implant is to be placed. Salah Huwais in 2013 introduced a new osteotomy procedure (Oseodensification) for site preparation without removal and bone preservation. The Osseodensification process produces an autograft layer around the implant with the osteotomy surface, the autologous bone comes into contact through an endosteal device that accelerates osseointegration due to the nucleation of osteoblasts in the instrumented bone adjacent to the implant and has a greater primary stability due to contact between the device and the bone.
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Kochhar, Rohit, and Sarah O’Connell. MRI safety and patients with implants. BJUI Knowledge, 2023. http://dx.doi.org/10.18591/bjuik.0706.
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Fraker, A. C., A. W. Ruff, A. C. Van Orden, H. Hahn, A. J. Bailey, and C. D. Olson. Studies of porous metal coated surgical implants. National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.85-3166.
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D'Albis, Giuseppe, Abdulrahman Omar Alrashadah, Marta Forte, Massimo Corsalini, and Saverio Capodiferro. Immediate Loading Implants in Fixed Partial Dentures. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2024. https://doi.org/10.37766/inplasy2024.12.0112.
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Kasidi, Heru, and Peter C. Miller. Norplant® use-dynamics diagnostic study, 1991. Population Council, 1992. http://dx.doi.org/10.31899/rh1992.1000.
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After five years of national programmatic use of Norplant® contraceptive implants, in 1992 the National Population and Family Planning Board (BKKBN) plans to implement a follow-up Use-Dynamics Study of implant users in West Java and West Sumatra Provinces, Indonesia. A Diagnostic Study was implemented in 1991 to prepare for that study prior to final approval, and to get some early insights into implant program operations in advance of final results from the main study. This report is a summary of findings from the Diagnostic Study. The Diagnostic Study had two broad objectives: to obtain information to guide development of the larger Use-Dynamics Study, and to supplement existing information on implant service delivery with a field-based observation study to help BKKBN make necessary decisions for its implant program. The Diagnostic Study helped in sharpening the original questionnaire draft, which has been appropriately revised.
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Breitwieser, Andreas, ed. Ceramic dental implants (NanoTrust-Dossier No63en - Aug. 2024). Self, 2024. http://dx.doi.org/10.1553/ita-nt-063en.
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