The Establishment Of Three-dimensional Finite Element Model And Finite Element Analysis Of Collision About Facial Bones

Being the exposed part of the body, whatever in time of peace or in time of war, the facial bones are easier to be hurt. And the most familiar kind of damnifications is collision. So the research of hurt which caused by collision present a great medicinal value. The traditional methods are human body research, animal experiment and model experiment. All these methods need long time to prepared, caused a lot expenses. But the biggest problem is too difficult to maintain the environment of the experiment. With the development of finite element analysis a new method of experiment was introduced into stomatology.To compare with the finite element analysis and the former methods, there are many strongpoints such as lower cost and risk, easier to repeat experiment and to control the environment of experiment. The result of finite element analysis is visualized and esay to compare. In this article we try to find a new way to establish a ankylosis of temporomandibular joint patient's three-dimensional finite element model. This model can process finite element analysis of non-elastic collision. To establish a ankylosis of temporomandibular joint patient's three-dimensional finite element model by reverse engineering.Choose a normal development young man(30 years) who suffered from ankylosis of temporomandibular joint as object modeling. His ankylosis of temporomandibular joint lasting more than 10 years resulted in an early age suppurative otitis. Gave him a facial CT scan and save the data in DICOM format. Transmit the DICOM format data into Mimics, obtaine 3D model of the skull and output to STL format. Transmit STL files into Geomagic, disconnect the upper and lower solid even teeth. Fill holes to simplify the model and smooth triangular patches. Obtaine 941 NURBUS curved surface. Transmit igs format curved surface into UG and CATIA to modify. Obtain the CAD model of facial bones. CAD model be imported in Hypermesh, mesh the model and set the boundary conditions. At last transmit the model into Ansys-LS_DYNA set initialization. The process of model establishment by reverse engineering accomplishe.Simulate 10m/s speed collision to the model in Ansys-LS_DYNA. Progress finite element analysis and obtain stress distribution images. Test geometrical comparability and mechanical comparability of the model. Provide a conclusion that the ankylosis of temporomandibular joint patient as same as normal person when strike his chin.Conclusion:(1)The ankylosis of temporomandibular joint patient's three-dimen sional finite element model established by reverse engineering coul d process finite element analysis of non-elastic collision. The mode 1 has good geometrical comparability and mechanical comparability.(2) The ankylosis of temporomandibular joint patient as same as normal person in given collision test.