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当牙冠因龋、外伤等原因引起牙齿缺损较大时，牙本质不足，使牙体预备难以为修复提供满意的固位效果，临床上经常发生充填物脱落，导致牙齿修复失败，自攻自断螺纹钉是牙体缺损修复的最佳固位钉，它既安全、固位力又大，应用螺纹钉与光固化复合树脂进行修复，不失为目前较理想的修复方法之一。
When the dental crown due to dental caries, trauma and other causes of dental defects larger, insufficient dentin, so that the preparation of the tooth is difficult to provide satisfactory retention of the retention effect of clinical filling often occur, resulting in failure of tooth repair, self-tapping since The broken thread nail is the best retention nail for dental defect repair. It is safe and has a large retention force. It is one of the more ideal repair methods to use the screw and light curing composite resin to repair it.