健康人最大开口运动的研究

A study of the maximal mouth opening movement of normal subjects

目的 探讨开口运动中髁突的运动及其与切点运动的关系。方法 采用三维下颌运动轨迹描记仪MT 160 2 ,记录 3 8名健康人髁突、切点标志点的运动数据 ,分析水平面髁突的运动曲线与速度。结果 研究结果表明 :①髁突水平轨迹为直线、流畅曲线共存 ;②运动速度曲线似三角形 ,波峰前后的加速度恒定 ;③双侧髁突滑动速度不等者较常见 ;④开口初期速度与水平轨迹形态有一定关系 ,轨迹矢量偏向运动较快的一侧 ;⑤开口形受髁突水平轨迹和双侧髁突相对运动速度共同影响。结论 髁突的运动对口颌系统功能状态有一定的适应性。

Objective The aim of this paper was to study condyle movement and the relation between it and incisor movement when the subjects performed maximal open closed movement Methods 38 normal students were tested by a six degrees of freedom mandibular movement recorder MT 1602 The traces and velocity curves of the condyle movement were analized on the horizontal plane Results (1)The horizontal traces of condyle movements included straight line and smooth curve (2)The velocity curve was like triangle Acceleration was constant before and behind the peak respectively (3)Unequal velocity of the bilateral condyles was common (4)The appearances of traces correlated with the beginning relative horizontal velocity of bilateral condyles The tracing vector was inclined to the rapid side (5)The incisor pathway was affected by both the relative horizontal velocity and the corresponding horizontal trace of the bilateral condyles Conclusion The movement of condyle were adaptable to the stomatognathic system