目的　研究纵裂磨牙保存治疗的方法及效果。方法　对 5 2颗纵裂磨牙采取固定、根管治疗、全冠修复治疗后随访观察 1年 ,记录分析其效果与初诊时间的关系。结果　就诊时间在 1周以内者 ,效果好 ,2周以上者 ,效果不佳。结论　尽早就诊、彻底根管治疗、全冠修复是纵裂磨牙保存治疗成功的关键。 Objective To study the method and effect of preservation and treatment of longitudinal molars. Methods Fifty two longitudinally grafted molar teeth were treated with root canal and root canal treatment. The patients were followed up for 1 year after the restoration of the crown. The relationship between the effect and the time of initial diagnosis was recorded and recorded. Results of treatment time within 1 week, the effect is good, more than two weeks, the effect is not good. Conclusion Early treatment, complete root canal treatment, crown restoration is the key to successful treatment of longitudinal molars preservation.