Research for the development of stomatognathic analyzing system

为寻找口颌系统功能评价的有用参数，建立口颌系统功能分析方法，对颞下颌关节功能障碍患者与正常人的颌功能进行了比较。此外，本研究还探讨了切距和咬合面接触对治疗效果的影响。简化的哥特式弓追踪法在临床应用中，可以利用前伸过程中的偏心运动量和侧偏量等参数来评价下颌运动.当需要更精确的分析时，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.下颌骨切点的前后偏和侧偏、肌肉活动的左右差异、敲击次数之间肌肉活动持续时间的变化、最大紧咬时的肌肉活动和功率谱是诊断颞下颌关节功能障碍的有用参数.结果提示，在减少颞肌活动方面，以5 mm为最佳咬合平面。前、后接触时肌电活动在平面上的表现不同。这些结果表明，控制肌电图活动的可能性，适用于每个病人的咬合平面与适当的垂直尺寸和咬合接触。

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.