Abstract: ObjectiveBased on the clinical features of cracked molars, the methods exploring conservative treatment to restore mastication have been studied. Methods50 cases clinical definite of cracked molar were treated synthetically. (1) Make occlusal adjustment for those that are on a deep pattern, the normal pulp, companied by allergic symptoms. (2) Make occlusal adjustment for those that are associated with pulpitis or periapical lesion, in order to prevent the teeth fracturing, through the teeth with ring external fixation. After conventional root canal treatment, patients were observed for two weeks. Those who were asymptomatic were entire crown repaired with metal ceramic dental. Two years later, the efficacy was analyzed. ResultsThrough the above comprehensive treatment, after entire crown repairing with metal ceramic dental, 45 cases of the racked molar having preserved significance were restored in the normal structure and masticatory function fully. The effective rate is 90％, and only five cases failed. ConclusionPrompt and appropriate synthetic treatment and entire crown repairing can save most of cracked molars and help them regain masticatory function. The effect of treatment is significant and effective.

Key words: cracked molars, root－canal therapy, band, complete coronal restoration