To investigate the Metergasis of physiology of mastication after loss of tooth for finding out the relation among sensory nerve,motor nerve of masseter muscle and central nerve around apical ligament.

• 目的:探讨牙齿丧失后,口腔咀嚼生理功能的变化,了解牙齿根尖周膜感觉神经与咀嚼肌运动神经,中枢神经的关系。