Development of Co-operation Diagnostic System for Facial Asymmetry Patient derived from Morphology and Function.

本研究的目的是利用三维CT图像进行形态学分析，并利用9通道肌电分析系统进行功能学研究。从三维CT图像中选取22个下颌骨标志点，测量双侧下颌骨的12个线性、角度和面积测量项目，建立双侧下颌骨的平均值、左右两侧的差异、相对于平均值的差异百分比、不对称程度和不对称程度指数。不对称指数与此指数的形态不对称在半侧颜面矮小症患者被发现在更多的位置和更高的程度比其他骨骼畸形患者。咬肌肌肉活动之间的关系，在最大的自愿收紧和咬合稳定性进行了研究，在唇腭裂患者和正常人，在儿童和成人。应用9导肌电分析系统对正常儿童的咬肌活动（数量和对称性）进行了研究，结果表明：正常儿童的咬肌活动和咬合稳定指数（OSI）与正常儿童基本相同。然而，儿童收缩弓组（CG）表现出不良和不对称的肌肉活动和咬合稳定性。咬肌活动和OSI之间有很强的关系。在戴上咬合板10天后，观察到儿童CG的咬肌活动得到改善，变得平衡，双侧咬合力增加。儿童组与成人组比较，正常对照组与正常对照组的肌活动量和骨密度的增长率非常接近，而正常对照组的肌活动量和骨密度的增长率明显高于正常对照组和正常对照组，这可能是正畸治疗和正常发育的结果。

The purpose of the present study is to analyze morphologically with the three-dimensional reconstruction of CT images and to investigate functionally with the 9 channel EMG analyzing system.22 mandibular landmarks were used from the 3D CT image tomeasure 12 bilateral linear, angular, and area items.From these bilateral measurement items, we established averages, differences between the left and right sides of the mandible, the percentage of difference in relation to the average, the degree of asymmetry, and an index of degree of asymmetry. the Asymmetry Index. With this index morphological asymmetries in the hemifacial microsomia patients were found in more locations and of a higher degree than in patients with other skeletal deformities.The relationship between the muscle activity of the masseter muscle at maximum voluntary clenching and the occlusal stability were studied in cleft lip and palate patients and normal subjects, both in children and adults. The masseter muscle activity (amount and symmetry) was investigated with 9 channel EMG analyzing system.The child Non-constricted Arch Group (NCG) showed almost the same muscle activity and Occlusal Stability Index (OSI) as that of normal child subjects. However, the child Constricted Arch Group (CG) showed both poor and asymmetric muscle activity and occlusal stability. A strong relationship between the masseter muscle activity and OSI was recognized. After wearing an occlusal splint for 10days, the masseter muscle activity of the child CG was observed to improve and became well balanced, bilaterally with increased occlusal force. In comparing child groups with adult groups, the NCG and the normal subjects showed very similar rates of increase in the amount of muscle activity and OSI,the CG showed remarkable rates of increase, above those of normal subjects and the NCG.These increases in the CG may result from the effect of orthodontic treatment as well as normal development.