[Clinical analysis of tooth fracture trauma by masticatory occlusion]

About 185 tooth fracture cases among 184 patients,it was found that tooth fracture happened on misticatory occlusion almost follows the regulation at the same tooth which has suffered of damage,such as dental caries,wedge shaped defect and cracked tooth and so on.The position of tooth damage is that of tooth fracture as well.The range and extent effect obviously on the tooth fracture.The terminal point of fracture line is related closely to pulp condition.It's considered that the out force is the major direct cause of tooth fracture,while position,extent,range and pulp condition before fracture is the main inner inducement fact.