重症牙体缺损系指因龋病、外伤或磨耗等所引起的牙冠缺损在1/2以上、临床常伴有牙髓和尖周病者。以往因牙体缺损大,用一般充填治疗时补物固位不良,难以承受(牙合)力,终因修复困难而不得不拔除患牙;从而成为咀嚼功能丧失的重要原因之一。如何尽可能地保存和恢复咀嚼功能,降低拔牙率,是口腔科学界越来越重视的问题。我科自1980年1月起采用支架修复重症牙体缺损465只牙,对395只牙经半年～ Severe dental defects refers to dental caries due to dental caries, trauma or wear caused by more than 1/2, clinically often accompanied by pulp and periapical disease. In the past due to large tooth defects, with the general filling treatment of poor complement retention, unbearable (occlusal) force, and ultimately because of the difficulty of repair and had to remove the tooth; thus becoming one of the important reasons for the loss of chewing function. How to save and restore masticatory function as much as possible and reduce the rate of tooth extraction is an issue that the oral science community pays more and more attention to. Our department since January 1980 with a bracket to repair 465 teeth of severe dental defects, 395 teeth by six months ~