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|title: ||Straight, semi-anatomic and anatomic TMJ implants: the influence of condylar geometry and bone fixation screws|
|authors: ||Ramos, A.|
|keywords: ||TMJ implant|
Finite element analysis
Stress and strain
|issue date: ||2011|
|abstract: ||A 3D finite element model of in vitro intact and implanted mandibles with different temporomandibular
joints (TMJ) was analyzed. Three TMJ implant geometries were assessed. The displacements, stress and
strain fields on the condyle were obtained for both simulated cases. Strains were also assessed near the
screws that fixate the implant to the mandible.
The geometry of the mandible was obtained through 3D digitalization of a synthetic model. The TMJ
implants studied were modelled considering a commercial implant which was also used to create semianatomic
and anatomic implants that were analyzed and to assess the influence of the geometry.
Numerical finite element models were built and the implants were positioned by an experienced orofacial
surgeon. All implants were fixed by four screws which were placed in the same position on the
mandible. The boundary conditions were simulated considering the support on the incisive tooth, the
loads of the five most important muscular forces and a 5 mm mouth aperture.
This study indicates that the deformation on the intact mandible was similar when an anatomic
implant was considered in the implanted mandible. However, the anatomic geometry presented some
problems concerning the implant integrity due to geometric variations. The geometry of TMJ implant
also played a role relatively to the screws structural integration and bone fixation. The geometry of TMJ
implant defines the necessary number of screws and position in the mandible fixation.|
|publisher version/DOI: ||http://dx.doi.org/10.1016/j.jcms.2010.07.006|
|source: ||Journal of Cranio-Maxillofacial Surgery|
|appears in collections||MEC - Artigos|
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