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

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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.