Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient. Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were

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... selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured. Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.