RESUMO
In vitro experimental data of angular displacement vs. applied force were obtained on a fully osseointegrated pair of endosseous implants in a mandible of a macaca mulatta monkey. These data are compared with calculated displacement data for a given force from a three-dimensional finite element model reproducing the geometric structure of a portion of the mandible holding the implants. The displacements show agreement over a range of forces in the elastic region within 3%. The FE model yields a full description of the bending of the implant and the distribution of the stress in the bone surrounding the implants.
Assuntos
Implantes Dentários , Análise do Estresse Dentário/métodos , Modelos Biológicos , Processo Alveolar/fisiologia , Animais , Dente Suporte , Implantação Dentária Endóssea , Elasticidade , Estudos de Avaliação como Assunto , Feminino , Macaca mulatta , Mandíbula , Análise Numérica Assistida por Computador , Reprodutibilidade dos Testes , Estresse MecânicoRESUMO
The finite-element method was used to assess force distribution to the cortical and cancellous bone surrounding two HA-coated, cylindrical implant designs, one grooved, the other smooth-sided. It was shown that, with both designs, large compressional stresses occurred in a small volume of bone at the coronal portion of the mandibular ridge. The stresses produced gave rise to a large stress gradient in the interface area. Significant differences were noted between the two designs in this area. It was also noted that the majority of the loading occurred in the cortical region of the mandibular ridge.