Objective:To observe the clinical effect of endodontic therapy and full crown restoration in the treatment of cracked teeth. Methods:The trace and depth of 50 cracked teeth were carefully examined under root canal microscope.According to the depth and scope of the cracks,the cracked teeth were classficated into the degree of Ⅰ,Ⅱ and Ⅲ,treated endodontically and restored with full crown.Results:During 1 year follow-up,34 cases showed successful effect,5 progressive,1 1 failure.The general effectiveness rate was 78.0%.The effectiveness rate of group Ⅰ,Ⅱ and Ⅲ was 93.3%,82.1 % and 28.6% respectively.Group Ⅰand Ⅱ vs Ⅲ,P <0.05,Ⅰvs Ⅱ,P >0.05.Conclusion:The treatment effect of cracked teeth is closely related to the depth and scope of cracks.

Objective To explore the clinical and endoscopy features of Mallory-Weiss Syndrome(MWS),and summarize the experience on the diagnosis and treatment of MWS. Methods We retrospectively analyzed the clinical data of cases of MWS. Results Including 11 cases homeostasis by endoscopy 31 cases received conservative treatment except 1 case by surgery. All cases were cured. Conclusion Endoscopy is the first choice of diagnosing MWS. It,s the effective homeostasis measure.