The bionics of optimal control of jaw movement during mastication : occlusal condition, texture of bolus, control of reflex

本研究于2003年完成时，测量了咀嚼过程中各种食物的特性变化，并确定为材料数据。此外，我们还测量了咀嚼颌运动。结果表明，咀嚼运动受牙周膜机械感受器和肌梭的机械刺激影响，从而达到控制咀嚼运动，有效地破坏牙团的目的，并建立了一种用计算机进行三维有限元模拟的计算动力学方法，使其向仿生学方向发展。采用非接触式表面形态测量系统测量上、下牙齿的表面形态和位置关系，并根据测量数据、牙团特征、颌骨运动建立三维有限元模型。2004年将该方法应用于正常牙合和错牙合，研究了牙团在口腔中的行为与牙体、牙周膜和下颌骨的应力之间的关系。从而揭示错牙合畸形所致的咀嚼功能障碍。

When we accomplished this study, in 2003, we measured the characteristics of various food which varied during mastication, and determined as material data. In addition, we measured the masticatry jaw movement. As a result of these, it is suggested that the masticatory jaw movement that it was influenced from mechanical stimulation to a periodontal mechanoreceptor and a muscle spindle in order to be controlled to destroy bolus efficiently.Furthermore, we established a method to simulate by the three dimensions limited element analysis that was a kind of calculation dynamics technique with a computer to develop it as bionics. Surface morphology and positional relationship of upper a d lower teeth were measured by using a non-contact-type surface morphology measurement system and made the three dimensions limited element model on the basis of the data from the morphology measurement, characteristics of the bolus, jaw movement. By this, it was able to reveal the relationship between the behavior of bolus in mouth and the stress to teeth and periodontal ligament and mandible.In 2004, this method applied to normal occlusion and malocclusion and examined the relationship between characteristics of bolus and the masticatry jaw movement. By this, it was able to reveal the chewing functional disorder by malocclusion.