因龋或创伤使牙冠大部缺损称之为线冠。以往是将其拔除后修复。随着口腔医学的发展,用综合治疗保留线冠,尽量避免拔牙,维持正常牙列有很大的临床意义。临床资料 近年来,我们以牙冠大部缺损的后牙随机分别用不锈钢丝支架(简称支架加固)、自攻自断螺纹钉(简称钉加固)加固后银汞充填。支架加固修复后牙线冠100余例,复查64例;其中男性30例;女性34例。牙冠缺损达冠3/4(有四个 Due to dental caries or trauma most of the crown called the crown. In the past it was removed after the repair. With the development of stomatology, the preservation of the crown with a comprehensive treatment, try to avoid tooth extraction, to maintain normal dentition has great clinical significance. Clinical data In recent years, most of our dental crowns with a stainless steel wire braces (referred to as stent reinforcement), self-tapping self-decaying screw (referred to as nail reinforcement) amalgam filling. Stent reinforcement after flossing crown more than 100 cases, 64 cases reviewed; of which 30 were males; 34 females. Crown defects up to 3/4 (four