Clinical effect of crown lengthening surgery on the residual root and crown

Objective To explore the clinical effect of treatment methods to restore the residual crown and root.Methods We collected 30 residual crown and roots teeth whose profile are located in the subgingival due to caries and tooth fracture.Then we randomly divided them into two groups,Gingival excision and surgical crown lengthening were applied respectively for repair of anterior gingival surgery treatment.Results The teeth sections were exposed well immediately.The gingival of the two groups had mild edema 1 week after operation,then improved obviously after 2 weeks.In the surgical crown lengthening group the gingival margin was in good shape after 6 weeks,and the gingival was return to normal after 6 months.The periodontal status improved obviously at each time point after operation.Some teeth sections of the gingival excision group were covered by the gingival after 6 weeks to 6 months.The periodontal conditions improved after 2 to 6 weeks,but the gingival sulcus bleeding index increased obviously after 6 monthes.Conclusion Compared to gingival excision,crown lengthening surgery is more advantageous to the residual crown and residual root preservation and restoration,but the choice of indication should be carefully considered.