Functional Evaluation of Orofacial and Hand-Tapping Movements in Edentulous Patients

为了比较口面部结构和上肢的运动技能，研究了下颌和手的运动与听觉信号之间的相关性。10名有牙的年轻人和2名老年无牙颌患者(1名不适应：A，另一名是很好地适应戴全口义齿：B)被要求以1.3次/秒的规则间隔产生的听觉信号同步地进行下颌或手的敲击运动。在敲击时，用2台高速摄像机从正侧两个角度记录下大脑(Me)和指尖(Ft)上的标记。自动跟踪每个标记的移动，并构建三维坐标的结果数据。然后，参考以下参数使用三维分析器(Movias 3D)计算每个监测点的轨迹：轨迹从开始到结束的总长度(TL)；轨迹开始和结束之间的距离(SL)；TL与SL的比率(T/S)；包围整个轨迹的矩形固体的体积(Cub)；在每个测量时间由先前和随后的轨迹的方向差产生的三维角度(TH)；结果表明：无牙颌组(A、B)的听觉信号与Ft运动之间的时差大于有牙组(N)。在A、B两个时相中，Ft、Cub、TL、SL和V均小于N，而Th则大于N。在Me的末期，A的Cub、TL、SL和V显著大于N，而B的除T/S小于N外，其余均在N的1SD范围内。

The correlation between movements of the mandible and hand in response to auditory signals were studied to compare motor skills in the orofacial structures and upper extremities.Ten dentulous young adults and 2 geriatric edentulous patients (one, who was not adapted : A, another, who was well adapted to complete denture wearing : B) were asked to make tapping movements of the mandible or hand in synchronization with auditory signals generated at regular intervals of 1.3 time/sec. While tapping, the markers on the menton (Me) and fingertip (Ft) were recorded on videotape using 2 high-speed video cameras from frontal and lateral perspectives. The, movements of each marker were automatically tracked, and the resulting data of the 3-dimensional coordinates was constructed. Then, the trajectory of each monitored point was computed using a 3-dimensional analyzer (Movias 3D) with reference to the following parameters: total length from start to finish of the trajectory (TL); distance between start and finish of the trajectory (SL); TL to SL ratio (T/S); volume of the rectangular solid encompassing the entire trajectory (Cub); the 3-dimensional angles created by the difference in the direction of the preceding and subsequent trajectories at each measured time (TH); and velocity (V).The following results were observed : The time-lag between the auditory signal and Ft movement in the edentulous subjects (A, B) was greater than that of the dentulous subjects (N). Although the time-lag between the signal and Me movement in B was similar to that of N, the time-lag in A was greater than in N and B.In both A and B, during the down phases of Ft, Cub, TL, SL and V were smaller and TH was greater than that in N. During the closing phases of Me in A, Cub, TL, SL and V were remarkably greater than that in N, however, in B, only T/S was smaller than in N and the others were almost within the range of 1SD of N.