Research for the development of stomatognathic analyzing system

为寻找评价口颌系统功能的有用参数，建立口颌功能分析方法，对TMJ功能障碍患者的颌骨功能与正常人进行了比较。本研究的结果总结如下：1.简化的哥特式牙弓描记法是一种非常有用的评估下颌运动的方法，在临床实践中，使用偏心移动量和前倾时的侧向偏移量等参数来评估下颌运动。当需要更准确的分析时，在电屏蔽室中同时记录下颌运动图(MKG)、肌电图(EMG)和咬合音。这些数据通过A/D转换器传送到计算机系统，并对各种参数进行分析。下颌切点前后侧偏移、左右侧肌肉活动差异、击打时肌肉活动时程变化、最大咬合时肌肉活动及功率谱是诊断TMJ功能障碍的有用参数。提示咬合面切迹间距为5 mm对减少颞肌活动效果最好。前、后牙合接触者在咬合面上的肌电活动表现不同。这些结果表明，通过为每个患者应用具有适当垂直尺寸和咬合接触的咬合面来控制肌电活动是可能的。

In order to-find some useful parameters for functional evaluation of stomatognathic system and to develop a stomatognathic analyzing method, the jaw function of patients with temporomandibular joint (TMJ) dysfunction was compared with that of normal subjects. Moreover, influence of interincisal distance and occlusal contacts of bite plane was examined to make clear the usefulness for treatment of the patients.The results of this study were summarized as follows :1. Simplified gothic arch tracing method is extremely useful for the evaluation of mandibular movement by using such parameters as a magnitude of eccentric movements and a lateral deviation during protrusion in clinical practice.2. When more accurate analysis is necessary, mandibular kinesiograph(MKG), electromyograph (EMG) and occlusal sound are recorded simultaneously in electrically shielded room. These data are carried to a computer system through A/D converter, and analyzed for various parameters.3. Antero-posterior and lateral deviation of mandibular incisal point, the difference between right and left side of muscle activity, and variation of muscle activity duration among tapping strokes, and muscle activity and power spectrum during maximal clenching are the useful parameters for the diagnosis of TMJ dysfunction.4. It is suggested that the bite plane with an interincisal distance of 5mm is most effective in reducing activities of temporal muscles. The behavior of EMG activities was different in between with anterior and posterior occlusal contacts on bite plane. These results suggest the possibility to control EMG activities by applying the bite plane with the proper vertical dimension and occlusal contacts for each patient.