牙体组织严重缺损在临床上较为常见,例如牙体大面积龋坏,前牙冠外伤折断及后牙冠部分劈裂等。治疗中仅仅采用一般的充填手段很难达到理想的固位力形和抗力形,难以恢复患牙原有的正常形态和生理功能,以致充填失败。作者从1994年起应用根管螺纹钉固位以及树脂材料恢复大部分缺损牙体,并做全冠修复疗效较为满意,现报告如下。 Serious defects in dental tissues are more common in clinical practice, such as dental caries in a large area, anterior crown fractures and fractures of the posterior crowns. In the treatment, it is difficult to achieve the ideal shape of retention and resistance with only ordinary filling means, and it is difficult to restore the original normal morphology and physiological functions of the affected teeth, so that the filling fails. The author from 1994 on the use of root canal screw nail retention and resin material to restore most of the defect body, and do full crown restoration more satisfactory results, are as follows.