DeVocht J W, Goel V K, Zeitler D L, Lew D
Department of Biomedical Engineering, University of Iowa, Iowa City 52242, USA.
J Oral Maxillofac Surg. 1996 Dec;54(12):1431-7; discussion 1437-8. doi: 10.1016/s0278-2391(96)90259-1.
A two-dimensional finite element model was developed to simulate and study the in vivo biomechanics and mechanisms of the human temperomandibular joint (TMJ) over the range of normal motion.
A nonlinear model was developed and run using the commercially available ABAQUS software with slide line elements that allowed large displacements and arbitrary contact of surfaces. The three main components of the model were the mandibular condyle, articular disc, and glenoid fossa region of the temporal bone, which were all modeled as deformable bodies. Continuous motion was simulated by doing a static analysis for each of many small steps. A parametric study was performed by determining the maximum stress in each of the three main components as a function of the elasticity of the articular disc.
The articular disc was found to move along with condyle in a lifelike manner, even when there were no attachments to the disc. Stress distribution plots showed relatively high stresses deep in the glenoid fossa for most steps. There was a direct, although nonlinear, relationship between maximum stress for all three components and the stiffness of the disc.
This model suggests that muscle contraction is not required to maintain proper disc position. Normal motion results in relatively high stresses deep in the glenoid fossa. The elasticity of the in vivo articular disc may be closer to the lower end of the reported values.
建立一个二维有限元模型，以模拟和研究人类颞下颌关节（TMJ）在正常运动范围内的体内生物力学及机制。
使用商业软件ABAQUS开发并运行了一个非线性模型，该模型采用了允许大位移和表面任意接触的滑移线单元。模型的三个主要组成部分为下颌髁突、关节盘和颞骨的关节窝区域，均被建模为可变形体。通过对许多小步骤中的每一步进行静态分析来模拟连续运动。通过确定三个主要组成部分中每一个的最大应力作为关节盘弹性的函数进行参数研究。
发现即使关节盘没有附着结构，它也能以逼真的方式随髁突移动。应力分布图显示，在大多数步骤中，关节窝深处的应力相对较高。所有三个组成部分的最大应力与关节盘的刚度之间存在直接但非线性的关系。
该模型表明，维持关节盘的正确位置不需要肌肉收缩。正常运动会导致关节窝深处产生相对较高的应力。体内关节盘的弹性可能更接近报道值的下限。
