材料力学性能对人颞下颌关节力三维非线性模拟的影响

比较分析骨性结构和关节盘的材料力学性能对在活性基础上建立的人颞下颌关节（Ｔｅｍｐｏｒｏ－ｍａｎｄｉｂｕｌａｒｊｏｉｎｔ，ＴＭＪ）三维非线性有限元模型模拟ＴＭＪ力的影响。方法利用Ａｕｔｏ－ＣＡＤ软件及螺旋ＣＴ扫描技术与有限元应力分析方法的相结合在活性基础上建立ＴＭＪ三维非线性有元模拟型并比较下颌骨，关节窝和关节盘选用不同材料力学性能时关节内应力的变化。结果骨组织的各种向同性和各向异性特征使组成ＴＭＪ

The effects of material mechanical properties on three-dimensional nonlinear simulation of human temporomandibular joint forces

Objective:To compare and analyze the effects of the material mechanical properties of the bone structure and disc within the temporomandibular joint (TMJ) on three dimensional nonlinear simulation of human TMJ forces. Methods: Combining spiral CT scanning technology with three dimensional finite element method, together with Auto CAD software, three dimensional nonlinear finite element models were developed, from in vivo, for comparison with the changes of the stress within the TMJ in the conditions of various material mechanical constants of the mandible, articular fossa and disc.Results: The isotropy and anisotropy of the bone tissue made some definite influences for the stress distribution of the TMJ bone structure. The material anisotropy increased their von Mises stresses, especially in the condyle and the anterior and medial regions named as the function loading in the joint. Meanwhile, the stresses in other positions of the bone structure and in the disc showed only a mild change. Various linear and nonlinear elastic moduli of the disc had no effect on the von Mises stress distribution in the TMJ during centric occlusion. Conclusion: The condyle and the anterior and medial regions in the TMJ may be the stress sensitive positions influenced easily by the change of material mechanical properties. The disc possesses a strong action on dispersing and buffering the force within the joint. The knowledge of the biological tissue mechanical properties is the foundation and assurance to reflect and simulate the mechanical environment in the life body more really and rationally.