Abstract:Objective To compare the effects of two different repair methods for root canal therapy on the posterior wedgeshaped defects.Methods Sixty patients with posterior wedgeshaped defect repair after root canal treatment from January 2017 to June 2017 were selected and divided into group A and group B(n=30,each) according to the patient′s supervisor.Fiber post,composite resin and zirconia porcelain crown repair were used in group A,and metal post core and metal porcelain crown repair were used in group B.The repair success rate,gingival plaque index before and after repair,gingival index,periodontal probing depth and the effect after repair were compared between two groups.Results After 6 months of repair,there was no significant difference in success rate of repair between two groups（100.00% vs 93.33%,P>0.05）.After one year of repair,the success rate in group A was statistically higher than that in group B (96.67% vs 73.33%,P<0.05);the plaque index,gingival index and periodontal probing depth were significantly lower than those in group B (P<0.05,P<0.01);the edge adhesion in patient′s prosthesis in group A was higher than that in group B (P<0.05).There were no statistically differences in the surface smoothness,color matching and fixation rate between two groups (P>0.05).Conclusion The effect of fiber post,composite resin and zirconia porcelain crown repair is better than metal post core and metal porcelain crown repair on the posterior teeth wedge defect after root canal therapy.