目的　探讨应用牙齿半切技术在磨牙保存治疗中的临床效果。方法　将该技术用于 136颗磨牙保存治疗中 ,对病变局限在根部的患牙 ,如合并牙周炎、尖周炎、根折及牙根纵裂等 ,拔除病患牙根 ;如病变在根分歧和髓室底时 ,只行牙齿半切术 ;将患牙进行完善的根管治疗后根据每颗牙齿缺损的程度、邻牙状况、对合牙及全身健康状态等因素 ,进行固定修复。结果　经 3年观察 ,保存成功率达94 85 %。结论　该技术操作简单 ,使用范围较广 ,在磨牙保存治疗中效果肯定。 Objective To investigate the clinical effect of half-cut technique in the preservation of molar. Methods The technique was used in the treatment of 136 molars, the lesions were limited to the roots of the teeth, such as the merger of periodontitis, periapical inflammation, root fracture and root rupture, removal of patients with root; such as lesions in the root disagreement And pulp chamber at the end of the line, only the operation of the hemi-semichemactomy; the teeth after a sound root canal treatment according to the degree of each tooth defect, adjacent teeth, the teeth and the general health status and other factors, fixed repair. Results After 3 years of observation, the success rate was 94 85%. Conclusion The technique is easy to operate and has a wide range of applications. It is effective in preservation and treatment of molars.