Abstract:

Objective    To study the stress distribution and displacement of the Chinese standard artificial temporomandibular joint. Methods    ANSA，Hypermesh and Abaqus softwares were used to establish finite element model of condylar defect，which was reconstructed separately by Chinese and Biomet standard artificial temporomandibular joint. The stress distribution and displacement of the jaw and Chinese and Biomet standard artificial temporomandibular joints were analyzed by loading maximal bite force on the model. Results    The maximum stress of four kinds of Chinese standard prostheses were 54MPa、79MPa、64MPa and 72MPa，while maximum stress of Biomet standard prosthesis was 78MPa.The stress of the jaw was under 20MPa in each model，and the displacement of prosthesis and jaw was under 0.05mm. The maximum stress of Chinese standard prosthesis occurred at the first posterior screw hole，whereas for Biomet standard prosthesis it was located at the neck of the condyle. Conclusion    The stress is distributed uniformly in Chinese standard prostheses， which can avoid prosthesis fracture and bone absorption caused by excessive stress.

Key words: artificial temporomandibular joint, biomechanical analysis, Chinese standard

摘要：

目的    探索国产标准型人工颞下颌关节假体的应力分布特点及形变情况。方法    利用ANSA、Hypermesh、abaqus等软件建立人工颞下颌关节修复下颌骨髁突缺损的有限元模型，在模拟最大咬合力加载情况下，分析4种国产标准型人工颞下颌关节假体及颌骨的等效应力分布特点和形变情况，并与美国Biomet标准型假体进行比较。结果    4种国产标准型人工颞下颌关节假体的最大等效应力值分别为54、79、64、72 MPa，美国Biomet标准型假体最大等效应力值为78 MPa，各模型中颌骨的等效应力值均低于20 MPa，最大形变值均小于0.05 mm。4种国产标准型人工颞下颌关节假体的等效应力均集中于下颌支假体后缘最上方的钉孔后部，而美国Biomet标准型假体的等效应力则集中于下颌支假体颈部。结论    4种国产标准型人工颞下颌关节假体应力分布均匀，可避免过大应力导致的假体断裂及骨质吸收等情况发生。

关键词: 人工颞下颌关节, 生物力学分析, 国产标准型