A Clinical Study in the Harmonizing Mechanism of Organs that Accomplish Chewing Movement

对完成咀嚼运动的器官进行了以下研究，咬合、颞下颌关节和咀嚼肌。在咬合时，对120名受试者进行了下颌运动的研究和记录。通过研究模型进行咬合分析，并对咀嚼运动记录进行分析。结果发现，下颌骨最重要的功能运动咀嚼运动具有特定的咬合异常特征，如错牙合或缺牙。特别是后牙反、正畸治疗后的骨性反和非工作侧的干扰显示了适当的异常模式.在颞下颌关节方面，对175名受试者进行下颌运动记录，包括髁突运动记录和颞下颌关节断层扫描。观察咀嚼运动与颞下颌关节正常的关系。髁突运动异常反映在咀嚼路径和咀嚼速度上.在咀嚼肌上，对30名受试者的咬肌、颞肌前腹、颞肌后腹和二腹肌前腹的肌电与咀嚼运动记录进行同步记录。口颌系统异常者对咀嚼运动与肌肉活动的关系有特征性的影响，为探讨咀嚼运动协调机制，对146例口颌功能障碍者进行了咬合和体层摄影检查。下颌第一磨牙缺失与髁突萎缩相关。另外，本研究亦记录了后牙反牙合患者的下颌运动及肌电，并对咬合异常与咀嚼肌活动的关系进行了研究。

Following studies were done on the organs that accomplish chewing movement, i.e., occlusion, temporomandibular joint and masticatory muscle.1. On occlusion, study models and records of mandibular movements of 120 subjects were taken. Analysis of occlusion by study models and analysis of the records of chewing movements were carried out. In result, characteristics of specific abnormalities of occlusion such as malocclusion or missing teeth were found in chewing movement, the most important functional movement of the mandible. Especially, posterior crossbite, orthodontically treated skeletal crossbite and interference at the non-working side showed proper abnormal patterns.2. On temporomandibular joint, records of mandibular movements including condylar movement and tomograph of temporomandibular joint of 175 subjects were taken. Relation of chewing movement and normality of temporomandibular joint was examined. Abnormal condylar movement was reflected in chewing path and chewing speed.3. On masticatory muscle, electromyograms of masseter, anterior and posterior temporal and anterior belly of digastric muscles were simultaneously recorded with chewing movement record from 30 subjects. Subjects with abnormal stomatognathic system showed characteristic influence to the relationship between chewing movements and muscle activities.To research the harmonizing mechanism of chewing movement from the result above, 146 subjects with stomatognathic dysfunction were examined by occlusion and tomogram. Loss of the lower first molar and condylar atrophy was related. Also, mandibular movement and electromyogram were recorded from subjects with posterior crossbite, and relation between abnormality of occlusion and activity of masticatory muscle is on research.Software that will suggest diagnosis and treatment plan for stomatognathic dysfunction is to be developed in the future.