Objective:To explore the effect of Lava Ultimate porcelain onlay and cast porcelain onlay on repairing teeth defects and its influence on gingival crevicular fluid inflammatory indicators and long-term preservation rate.Methods:The clinical data of 122 patients with teeth defects were retrospectively analyzed.They were divided into ultimate porcelain group and cast porcelain group ac-cording to the different treatment methods,with 61 cases in each group.The ultimate porcelain group was treated with Lava Ultimate porcelain onlay repair,while the cast porcelain group adopted cast porcelain onlay repair.The differences in periodontal conditions and gingival crevicular fluid inflammatory indicators before repair and after 6 months of repair and repair effect and pink esthetic score after 2 years of repair were compared between both groups.Results:After 6 months of repair,the periodontal conditions and gingival crevicu-lar fluid inflammatory indicators in both groups were improved(P＜0.05),but there were no significant differences between the two groups(P＞0.05).After 2 years of repair,the tooth integrity and soft tissue shape in ultimate porcelain group were better than those in cast porcelain group(P＜0.05),and the soft tissue color was better in cast porcelain group than that in ultimate porcelain group(P＜0.05).Conclusion:Both Lava Ultimate porcelain and cast porcelain onlays have good effects on repairing teeth defects and can improve the periodontal conditions and gingival inflammatpry response,but cast porcelain onlay has better color,while Lava Ultimate porcelain onlay has better tooth integrity and soft tissue shape,and suitable repair materials can be selected according to patients' wishes.