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To investigate the aesthetic efficacy and effect of fiber post, composite resin and zirconia porcelain crown on periodontal tissue in the treatment of wedge-shaped defects of posterior teeth after root canal treatment. Methods: 103 cases of wedge-shaped defects of posterior teeth after root canal treatment in our hospital from January 2018 to March 2019 were selected as the research objects, were divided into control group (n=52, affected teeth 62) and the research group (n=51, affected teeth 63) according to different restoration materials. The patients in the control group were treated with metal post core and metal porcelain crown repair, while the patients in the research group were treated with fiber post, composite resin and zirconia porcelain crown repair. The repair success rate and repair effect of the two groups 1 year after repaired were compared. The gingival index, plaque index, depth of periodontal probe, gingival crevicular fluid amount and alkaline phosphatase (ALP) and aspartate aminotransferase (AST) in gingival crevicular fluid of gingival crevicular fluid of the two groups before repaired and 1year after repaired were compared. Results: The repair success rate of research group was higher than that of control group(P<0.05). The surface smooth rate, edge tight rate, good fixation rate and color match rate of restoration of the research group were significantly higher than those of the control group (P<0.05). The gingival index, plaque index, depth of periodontal probe of the two groups were significantly lower than before treatment (P<0.05), the gingival crevicular fluid amount and ALP, AST of gingival crevicular fluid of the two groups were significantly lower than before treatment (P<0.05), and the gingival index, plaque index, depth of periodontal probe of the research group were lower than those of control group (P<0.05), but there were no significantly differences of the gingival crevicular fluid amount and ALP, AST of gingival crevicular fluid of the two groups aftertreatment (P>0.05).Conclusion: Fiber post, composite resin and zirconia porcelain crown on periodontal tissue in the treatment of wedge-shaped defects of posterior teeth after root canal treatment has high success rate, with good aesthetic effect, and little influence on periodontal tissue. [ABSTRACT FROM AUTHOR]