下颌绞链运动轴点稳定性及位置的探讨

本研究的目的在于探讨下颌绞链运动轴点的位置是否恒定以及它是否位于髁突中心点。采用新型的三维下颌运动轨迹描记仪ＭＴ－１６０２测量了１４名健康人在４次重复性实验中，下颌小张闭口运动绞链轴点的稳定性及其与髁突的位置关系。结果表明，下颌后退位的小张闭口运动所测得的绞链轴点位置不恒定，存在瞬间绞链轴点。双侧绞链轴点基本均匀地分布于髁突四周，其距髁突中心点的平均距离为８．８３±５．６５ｍｍ。这一结果对临床正确使用架有直接的参考价值。

Evaluation of reproducibilty of the hinge-axis and it''s positional relation to condyles]

The aim of this paper was to study the reproducibility of the positions of hinge-axis of mandibular retruded small open-closed movements, and the positional relationship between the hinge-axis and condyles. Fourteen normal students were tested by a six degrees of freedom mandibular movement recorder MT1602 (Germany). The result showed that: the hinge-axis could not be exactly repeated and movable instantaneous centers of rotation (ICR) were recorded. These rotation centers distributed almost evenly around the condyles, the mean distance from these rotation centers to condyle centers was about 8.83 +/- 5.65 mm.