Methods: Occlusal casts were obtained from 23 asymptomatic volunteers and 130 TMD patients.And their chewing movement tracings were recorded by mandibular kinesiograph (MKG).

• 方法：23名无症状大学生志愿者和130名TMD患者，取研究模，记录咀嚼运动（牙合）期轨迹。