中文摘要：

目的研究正常人牙尖交错位紧咬时颞下颌关节的接触特征及应力分布情况。方法建立颞下颌关节三维有限元模型，在Marc软件中定义髁突、关节盘和关节窝三者间的接触关系，运用接触模式，采用自动探测的方法求解有限元分析软件。结果牙尖交错位紧咬时，关节盘后带与双板区的交界处和髁突的后斜面首先发生接触，随后髁突的顶部、内侧面与关节盘的后带，髁突的前斜面与关节盘的中间带也发生接触。同一矢状面上VonMises应力平均值的大小依次为：髁突〉关节盘腹面〉关节盘背面〉关节窝。结论Marc所提供的接触分析模块能较为真实地反映牙尖交错位紧咬时颞下颌关节的接触特征；颞下颌关节各结构通过相互接触及关节盘的缓冲使应力分散和传递，反映颞下颌关节各解剖结构与生理功能之间具有良好的适应性。

英文摘要：

Objective To analyze the stress distribution of the temporomandibular joint（TMJ） during elenehing under eontaet mode with 3D finite element method（FEM）.Methods The eondyle,disc ane fossa were defined as eontaet bodies in Mare.The stress distribution and eontaet eondition were observed by automatie eontaet detection. Results During elenehing, the posterior inelined plane of the condyle eontaeted with the junction of the posterior band and bilaminar region of the disc firstly. The upper and the rnesial planes contacted with the posterior band; the anterior inclined plane contacted with the intermediate zone secondly. In the same sagittal plane, the equivalent Von Miscs stress of the condyle was the biggest, the ventral disc was bigger than the dorsal surface, while the fossa was the smallest. Conclusion The biomechanical analyses of the TMJ under contact mode are in accord with physiological conditions. Stress distribution of the TMJ is adapted to the physiological characteristics.