金属钉固位修复牙体组织缺损已在临床上广为应用，尤其是自攻自断螺纹钉的应用范围不断扩大，并且取得了良好的固位效果。以往固位钉修复牙体组织缺损均用于恒牙，作者应用螺纹钉固位修复乳磨牙大面积缺损并进行３年随访观察，现浅淡一些治疗体会，供广大同行参考。１材料... Metal nail retention dental tissue defect repair has been widely used in clinical practice, especially the self-tapping self-breaking screw the scope of the continuous expansion, and achieved good retention effect. In the past, the fixation of nails to repair dental defects were used for permanent teeth. The authors used screw fixation to repair large area of ​​primary molar defects and 3 years of follow-up observation. Now some of the treatment experience is light, for the majority of peer reference. 1 material ...