磨牙、残冠及冠折是口腔常见病和多发病。常用的治疗方法是将其拔除后进行修复,或进行彻底的根管治疗后金属全冠修复。笔者从1981年初开始对牙根周健康、稳固、牙冠尚能预备成固位沟或固位斜面的磨牙残冠及冠折牙,预备辅助固位型和抗力型,用0.9、0.8或0.7号不锈钢丝弯制成一个或两个“7或9”形桩钉,用水门汀粘固于根管内,用充填树脂 Molar, residual crown and crown fold is a common disease and frequently-occurring disease. Common treatment is to remove it after repair, or after a thorough root canal treatment of metal crown restoration. The author from the beginning of 1981 on the root of the week healthy, stable, the crown can still be prepared into a retention groove or retention bevel crown and crown teeth, the preparation of auxiliary retention and resistance type, with 0.9,0.8 or 0.7 Stainless steel wire bend made of one or two “7 or 9” -shaped pegs, cement with cement anchored in the root canal, filled with resin