最大闭口咬合状态下颞下颌关节的接触特征分析

目的研究颞下颌关节在最大闭口咬合状态下的接触方式和应力分布。方法用可视化人体图像数据先建立颞下颌关节的三维实体模型,在Marc中再进行有限元模型的建立,定义髁状突、关节盘、关节窝三者之间的接触关系,观察其接触特征。结果在最大闭口咬合接触下,髁状突先与关节盘后带与双板区交界处发生接触,同时,关节盘相对髁状突作向前滑动,髁突的等效应力值大于关节盘,而关节窝的应力水平最小。结论在最大闭口咬合状态下,关节盘后带与双板区的交界处以及中间带均为重要的应力缓冲区域。

The study of contact characteristic of temporomandibular joint under maximum jaw closure

Objective To study the contact mode and stress dirstribution of temporomandibular joint (TMJ) under maximum closure.Methods On basis of Chinese Visible Human, a finite element model of TMJ was created after the solid model was built up formerly.The condyle,articular disc and glenoid fossa were defined as contact bodies.Results The region adjacent to posterior band and bilamina zone contacted with condyle at first,meanwhile,the disc slided along the surface of condyle,the von Mises stress in condyle was higher than that in disc and glenoid fossa.Conclusion Both of the intermediate zone and the region between the posterior band and bilamina zone have played the important role to distribute the stress resulting in TMJ during maximum jaw closure.