Zhang X, Ashton-Miller J A, Stohler C S
Stomatognathic Physiology Laboratory, School of Dentistry, University of Michigan, Ann Arbor 48109-1078, USA.
J Biomech. 1995 Aug;28(8):1007-11. doi: 10.1016/0021-9290(94)00117-m.
Using a unilateral optoelectronic tracking system (JAWS-3D), a method was developed for the simultaneous measurement of the three-dimensional kinematics of both ipsilateral and contralateral human condyles, the latter being represented by virtual points beyond the field of vision of the camera system during the actual recording. The method leaves the subject's head unrestrained while measuring the movements of two sets of three light-emitting diodes rigidly attached to the upper and lower teeth. The Tait-Bryan angles method was employed for calculating the jaw rotations in three dimensions. Movements were referenced to both a skeletal and a dental coordinate system. The worst-case static measurement errors were 0.24 mm for a 20 mm translation and 0.71 degrees for a 35 degrees rotation. The mean dynamic measurement errors were 9.73 microns s-1 at a constant linear velocity of 200 microns s-1 and 0.73 degrees s-1 at a constant angular velocity of 149 degrees s-1. The utility of the method was demonstrated in a subject who was asked to open and close the mouth in a cyclic fashion.
使用单边光电跟踪系统（JAWS-3D），开发了一种用于同时测量同侧和对侧人类髁突三维运动学的方法，后者由实际记录过程中超出摄像系统视野范围的虚拟点表示。该方法在测量牢固附着于上下牙齿的两组三个发光二极管的运动时，不对受试者头部进行约束。采用泰特-布莱恩角方法计算颌骨的三维旋转。运动参考骨骼坐标系和牙齿坐标系。对于20毫米平移，最坏情况下的静态测量误差为0.24毫米；对于35度旋转，为0.71度。在200微米/秒的恒定线速度下，平均动态测量误差为9.73微米/秒；在149度/秒的恒定角速度下，为0.73度/秒。在一名被要求以循环方式张闭口的受试者身上证明了该方法的实用性。
