Abstract: Objective To explore the stress and displacement distributions of the Chinese customized 3D-printing total temporomandibular joint prostheses,so as to optimize the design. Methods Three-dimensional (3D)model was established by Mimics 18.0.The Hypermesh and LS-DYNA softwares were used to establish the computer aided engineering(CAE)finite element model. The stress and displacement distributions of the jaw and the Chinese custom-made temporomandibular joint (TMJ)prosthesis were analyzed by loading maximal masticatory force on the model. Results The maximum contact force on the surface of UHMWPE was 495.7 N and the maximum bite force in the anterior teeth was 201.12 N. The largest displacement was in the condylar head, which was found to be 0.4152 mm. The maximum stress in the surface of UHMWPE was 20.66 MPa, slightly larger than the yield strength. The maximum stress in the mandibular component was located at the posterior surface of the condylar neck, reaching 122.1 MPa. Conclusion Despite the need for improvement in some details, the Chinese customized 3D-printing total TMJ prosthesis still exhibits good biomechanical properties with a promising future.

Key words: Total temporomandibular joint prostheses, Finite element analysis, Stress distribution