成人之下顎運動速度與顱顏齒列形態的關係 中文摘要
下顎運動速度是評估口顎系統動態運動功能的指標之一，但個體間的差異變化相 當大。影響下顎運動速度表現的原因，除了咀嚼肌本身的差異外，其周圍的骨骼 系統、支配的神經系統均扮演重要角色。本研究的目的希望藉由下顎運動軌跡記 錄系統（mandibular kinesiography）觀察不同顱顏形態之成年人的下顎運動速度 表現，以瞭解下顎運動速度與顱顏齒列型態的相關性。實驗對象為無顱顏畸形及 下顎運動障礙之 127 位成年人，其中男性 84 位，女性 43 位，年齡分布 21 至 26 歲。受測者接受測顱 X 光攝影及齒列模型製作以分析顱顏齒列型態，並利用下 顎運動軌跡記錄器記錄開口、閉口時的最大及平均速度和閉口末端接觸速度，所 得的各變項值再進行相關性的統計分析。結果顯示個體本身之開口、閉口速度間 相關性很高（p<0.001），但個體間的開口、閉口速度存在明顯差異；性別間亦存 在明顯差異（p<0.01），男性之開、閉口速度均大於女性。與顱顏齒列形態的相 關性並不明顯，僅男性的閉口速度會受上顎門齒之萌出度、傾斜度及與下顎門齒 之垂直覆蓋量影響（p<0.05）；男女之閉口末端接觸速度會隨顱顏開展度增加而 增大（p<0.05）。所以，造成下顎運動速度個體差異的原因，顱顏齒列形態差異 造成的影響並不大。
英文摘要
The relationship between the morphologic characteristics of facial skeleton and the function of the masticatory system has been studied extensively. Mandibular movement velocity is one of the parameters used to evaluate the mandibular function. However, the interaction between dentofacial morphology and mandibular movement velocity is unclear. The aims of this study were to investigate the mandibular movement velocity in different dentofacial morphology of young adults and observe the association between different characteristics of the dentofacial morphology and the velocity of mandibular movement. One hundred twenty seven young adults (84 males, 43 females, age ranged from 21 to 26 years) were
observed by using Myotronics Kinesiograph K-6 model for the measurement of jaw motion velocity. Five consecutive open-close strokes were recorded for evaluating the following parameters. (1) the maximal opening and closing velocity, (2)the average opening and closing velocity, and(3)the maximal velocity of terminal tooth contact. Dentofacial morphology was evaluated with conventional lateral
cephalometric radiographs and dental cast. Analysis of data indicated that the correlation between the opening and closing velocity among individual was high (p<0.01), but there existed large interindividual variation. Only the maximum and average closing velocity of the male subjects had the significant association with the
position of upper incisor (p<0.05). It could be concluded that there existed weak correlation between the velocity of mandibular movement and dentofacial
morphology.
