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

对完成咀嚼运动的器官，即咬合、颞下颌关节和咀嚼肌进行了以下研究。在咬合情况下，对120名受试者进行下颌运动研究模型和记录。通过研究模型对咬合进行分析，并对咀嚼运动记录进行分析。结果，在下颌最重要的功能性运动--咀嚼运动中，发现了特定的咬合异常的特征，如错牙合或缺牙。特别是后牙反牙合、正畸矫治的骨性反牙合和非工作侧的干扰表现出较好的异常形态。记录175例受试者下颌关节的下颌运动情况，包括下颌关节的运动情况和下颌关节的断层图像。观察咀嚼运动与颞下颌关节正常度的关系。咀嚼路径和咀嚼速度反映出髁突运动异常。在咀嚼肌上，记录30例受试者的咀嚼运动，同时记录咀嚼肌、二腹肌前、后、前腹肌的肌电。口颌系统异常受试者对咀嚼运动与肌肉活动的关系表现出特征性的影响，为探讨咀嚼运动协调机制，对146例口颌功能障碍受试者进行咬合检查和体层摄影检查。下颌第一磨牙缺失与髁状突萎缩有关。此外，还记录了后反牙合受试者的下颌运动和肌电，咬合异常与咀嚼肌活动之间的关系正在研究中，为口颌功能障碍的诊断和治疗方案提供建议的软件还有待开发。

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.