RESUMO
Objective To provide evidence for the relationship between TMD and occlusal trauma by studying the mechanics influence and displacement of condyle by building the three dimensional finite element analysis model andstimulating the abnormal bite force leading occlusal trauma.Methods We collected DICOM date of healthy male volunteers with normal occlusal relationship using CBCT scan with constraint on condylar top and formed the finite model with divide mesh.Two conditions were built: (1) We operated different vertical load on the left mandibular molar occlusal surface; (2) We operated different buccal direction load on the same modelto study the mechanic change on left condylar.Results When the three dimensional finite model of mandible was built, the mechanic region of condyle stayed the same but the stress and tension increased accordingly as the loda duplicate rose. As the same buccal operation load was operated,the stress and tension became larger and the displacement became longer.Conclusion The abnormal bite force causing occlusal trauma can change mechanic conduct on condyle and lead to the pathological change of condyle.