Objectives:This study evaluated by three-dimensional finite element analysis the tensions generated by different disocclusion patterns (canine guide and bilateral balanced occlusion) in an implant-supported mandibular complete denture.Material and Methods:A three-dimensional model of implant-supported mandibular complete denture was fabricated according to the Brånemark protocol. A 5-element 3.75 x 13-mm screw-shape dental implant system was modeled for this study. The implants were located in the intermental foramen region with 3-mm-high prosthetic components joined by a nickel-chromium framework with 12-mm bilateral cantilever covered by acrylic resin and 12 acrylic denture teeth. SolidWorks® software was used before and after processing the simulations. The mechanical properties of the components were inserted in the model and a 15 N load was established in fixed points, in each one of the simulations. Data were collected in the entire nickel-chromium framework. The results were displayed three-dimensionally as color graphic scales.Results:The canine guide generated greater tensions in the region of the first implant, while the bilateral balanced occlusion generated great tensions in the entire metallic framework. The maximum tension found in the simulation of the bilateral balanced occlusion was 3.22 fold higher than the one found in the simulation of the disocclusion in canine guide.Conclusion:The pattern of disocclusion in canine guide is the ideal for implant-supported mandibular complete denture.

A comparative and qualitative analysis of the tensions generated in the cantilever region of an implant-supported mandibular complete denture was conducted using the three-dimensional finite element method. The mechanical properties of the components were input in the model and a load of 15 N was applied in pre-determined points. In the first simulation, the load was applied on the occlusal surface of the first premolar. In the second simulation, it was applied on the first and second premolars. In the third simulation, it was applied on the first and second premolars and on the first molar. The different occlusion patterns produced similar tension distributions in the cantilever region, which followed a similar pattern in the three simulations. In all of the cases, the highest levels of tension were located in the region of the first implant. However, as the loads were dislocated distally, the tensions increased considerably. The more extensive the cantilever, the more compromised will be the infrastructure, the prosthetic components and the implants. Regardless of the length of the cantilever, the highest tensions will always be located in the region of the implant next to the load application point.

ObjectiveThe occlusal patterns are key requirements for the clinical success of oral rehabilitation supported by implants. This study compared the stresses generated by the disocclusion in the canine guide occlusion (CGO) and bilateral balanced occlusion (BBO) on the implants and metallic infrastructure of a complete Brånemark protocol-type denture modified with the inclusion of one posterior short implant on each side. Material and MethodsA three-dimensional model simulated a mandible with seven titanium implants as pillars, five of them installed between the mental foramen and the two posterior implants, located at the midpoint of the occlusal surface of the first molar. A load of 15 N with an angle of 45º was applied to a tooth or distributed across three teeth to simulate the CGO or BBO, respectively. The commercial program ABAQUS® was used for the model development, before and after the processing of the data. The results were based on a linear static analysis and were used to compare the magnitude of the equivalent stress for each of the simulations. ResultsThe results showed that the disocclusion in CGO generated higher stresses concentrated on the working side in the region of the short implant. In BBO, the stresses were less intense and more evenly distributed on the prosthesis. The maximum stress found in the simulation of the disocclusion in CGO was two times higher than that found in the simulation of the BBO. The point of maximum stress was located in the neck of the short implant on the working side. ConclusionsUnder the conditions of this study, it was concluded that the BBO pattern was more suitable than CGO for the lower complete denture supported by implants without free distal ends.

Objective Methods By means of a literature review focused on published articles with clinical follow-up between 8 and 15 years. Results Implants placed in the mandible had higher success rates than those inserted in the maxilla. Cases with longer follow-up periods, 15 years, showed higher success rates in comparison with follow-up periods of 8 and 10 years. Conclusion Success rates of implant-supported complete dental prostheses are very high. Indexing terms: Complete dental prostheses. Dental implantation. Osseointegration RESUMO ObjetivoAvaliar o índice de sucesso clínico dos implantes pilares de próteses totais implantossuportadas. As próteses implantossuportadas vêm sendo utilizadas como uma alternativa viável ao planejamento de reabilitação oral. O protocolo de dois estágios cirúrgicos, ao passar dos anos, vem sendo cada vez mais substituídos pelos procedimentos de carga imediata, principalmente na região anterior inferior, nos casos de reabilitação de pacientes totalmente desdentados. Tal procedimento torna-se viável devido ao alto índice de sucesso da técnica com resultados bastante satisfatórios. MétodosPor meio de uma revisão de literatura focada em trabalhos publicados com acompanhamento clínico entre 8 e 15 anos. ResultadosOs implantes instalados em mandíbula apresentaram índices de sucesso maiores que os instalados em maxila. Os casos com acompanhamento mais longos, com 15 anos, apresentaram índices de sucesso maiores do que quando comparados aos acompanhamentos de 8 e 10 anos. ConclusãoO índice de sucesso dos implantes pilares de prótese total é bastante alto.Termos de indexação: Prótese total. Implantação dentária. Osseointegração.

A tomografia computadorizada de feixe cônico (Cone Beam) vem favorecendo o diagnóstico por imagem em diversas especialidades odontológicas. Porém, devemos saber exatamente quais são as suas indicações e vantagens frente aos exames radiográficos convencionais. Os pacientes com fissuras palatinas necessitam de intervenção cirúrgica de acordo com o tipo e grau de sua fenda palatina para reabilitação estética e funcional. Paciente I. L. S. S., sexo feminino, 14 anos de idade, foi submetida a alguns exames radiográficos e tomográficos para dar continuidade ao seu tratamento cirúrgico-reabilitador associado a sua fissura palatina. Em todos os exames realizados foi possível identificar e avaliar tal anomalia, mas foi por meio da tomografia computadorizada cone beam e suas reconstruções tridmensionais que foi possível observar toda extensão e profundidade das fendas, garantindo a realização de um planejamento cirúrgico de enxerto ósseo, com critérios bem estabelecidos.

Aim: Little is known about the biomechanical behavior of disocclusion patterns in implantsupported prostheses. Thus, the aim of the present study was to analyze the stresses generated at bone-implant interface during different patterns of disocclusion in an implant-supported lower complete denture without free distal ends using the three-dimensional (3-D) finite element method.

A agenesia dental é uma anomalia caracterizada pela falta do elemento dental, podendo estar associada a fatores genéticos ou fenômenos isolados. A falta do elemento dental pode alterar funções como a estética, fonética, deglutição, e até mesmo a vida pessoal do indivíduo. Diversos tratamentos podem ser preconizados dependendo da necessidade e condições do paciente, como cirurgia para instalação de implantes e próteses fixas. Portanto, o trabalho demonstra através de um caso clínico uma nova possibilidade para o tratamento da agenesia dental, considerando-se que a paciente não queria se submeter a procedimentos invasivos, além de possuir um incômodo imediato com a estética do seu sorriso. O tratamento proposto foi utilizar lâminas cerâmicas ultrafinas na reabilitação da estética e função, tendo em vista que são considerados materiais resistentes e duráveis quando corretamente indicados.

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