成人之下顎運動速度與顱顏齒列形態的關係

官儀妍

指導教授 ： 蔡吉陽 ； 吳慶榕

臺北醫學大學/口腔學院/牙醫學系碩博士班/碩士(2002年)

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。

關鍵字

下顎運動速度 ； 顱顏齒列形態

並列摘要

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.

參考文獻

67. Wu CZ. The immediate effects of Occlusal splint on the mandibular movement velocity in healthy individuals. New Taipei J of Medicine, 3: 165-172, 1999.

33. Ueda HM, Ishizuka Y, Miyamoto K, Morimoto N, Tanne K. Relationship between masticatory muscle activity and vertical craniofacial morphology. Angle Orthod, 68(3): 233-238,1998.

37. Warner M. Relationships between dentoskeletal morphology and myofiber characteristics of the human masseter muscle, doctoral dissertation. University of Taxas Health Science Center, Department of Cell Biology, Dallas, Tex, 1984.

1. Lieber RL. Skeletal muscle mechanics: Implications for rehabilitation. Phy Ther. 73: 844-856, 1993.

2. Barany M. ATPase activity of myosin correlated with speed of muscle shorting. J Neurol Sci, 14: 171-182, 1967.