The measurement of tooth displacement during final occlusal stage and physiological clucidation of the stomatognathic function -using the changed pathway of the jaw movement after orthodontic treatment-

本研究的目的是测量牙齿在咀嚼过程中的微小移动，特别是在咬合的最后阶段，了解口腔功能，以找出与咬合状况的关系。在本研究中，我们重点研究了以下几个方面。牙齿微小位移的测量我们使用现有的光纤位移传感器(ST-3713IWATSU)测量了牙齿的实际微小位移。由于不需要接触目标，因此可以在不干扰牙齿固有位移的情况下测量牙齿的位移。此外，利用非线性动态有限元方法对牙周膜进行了动态模拟，研究了咬合冲击力对牙齿的传递和吸收。结果1.揭示了牙周膜的力学背景(第四届口腔颌面部生物力学研讨会)。口腔颌面功能的阐明为了评估功能性咬合过程中牙齿的移位，我们研究了牙齿移位、咀嚼运动和咬合力。也就是说，通过食物破坏效率的媒介，我们既从理论上研究了咬合末期咀嚼运动的途径(《口腔功能杂志》，第3卷，1997年第2期)，又通过临床观察(MM-JI-E，Shofu)(《中国日报》，《口腔功能》，第3卷，1997年第2期)测量了牙合力的变化。我们已经认识到咬合力平衡点的变化与口腔颌面功能之间的重要关系(J.Jpn.Orthod.Soc，在新闻中)。

The aim of this study was to measure the minute tooth movement during mastication, especially at the final stage of occlusion, and to understand the stomatognathic function in order to find the relation with occlusal condition. In this study, we have put great emphasis on the following items.1. The measurement of the minute displacement of toothWe have measured the actual minute displacement of the tooth using the available optical fiber displacement sensor (ST-3713 IWATSU). Because of no necessity for contacting the target, we could measured such displacement without disturbing the intrinsic displacement of the tooth.Additionally, a dynamic simulation of periodontal ligament was performed to investigate the transmission and absorption of the occlusal impact force applied to the tooth using a non-linear dynamic finite element method. The results revealed the mechanical background of periodontal ligament (The 4th Symposium on Oromaxillofacial Biomechanics).2. The elucidaton of the stomatognathic functionTo evaluate tooth displacement during functional occlusion, we investigated tooth displacement, masticatory movement and occlusal force. That is to say, by the media of efficiency of food destruction, we both theoretically investigated the pathway of masticatory movement during final occlusal stage (J.Jpn.Soc.Stomatognathic Funct., vol.3 No.2 1997) and clinically observed the data measured by recording apparatus (MM-JI-E,Shofu) (J.Jpn.Soc.Stomatognathic Funct., vol.3 No.2 1997).To exame the way that the stomatognathic function is controlled during the time course of changing of relative position of upper and lower teeth, we also measured such changing of occlusal force. We have recognized the significant relationship between the change of the balancing point of occlusal force and the stomatognathic function (J.Jpn.Orthod.Soc., in press).