3-D digital modeling and bio-mechanics research of the anterior disk displacement without reduction temporomandibular joint system

Abstract

Background： Anterior and/or medial displacement of the articular disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction.In the present study,3D finite elements analysis (FEA) models including the maxilla, disc and mandible were established using 3D data registration technology. Materials and Methods： Six healthy volunteers and 20 TMD patients were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc. Result: Results showed that maximum stress of the normal lateral articular disc in the normal and pathological models appeared in the lateral part of the middle band. In the normal model, stress distribution was more uniform and the joint disc and the condyle were also subjected to higher load at the junction of the articular disc and the condyle. 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 cd32fvhigher than those of the normal lateral joint.