Abstract: [Abstract]Objective: To explore the differences of the clinical effect of direct resin filling and cast porcelain high inlays on repairing defect of posterior teeth. Methods: fifty-three patients with defect of posterior teeth who treated in our hospital from February 2018 to February 2019 were selected and randomly divided into two groups. The control group (n=26, 34 sick teeth) was given direct resin filling, and the observation group (n=27, 36 sick teeth) was given cast porcelain high inlays repairing. The repair time, median occlusal condition, repair effect after 12 months follow-up, success rate of repairing, gingival groove bleeding index, gingival index score and subjective satisfaction of patients before and after repairing were compared between the two groups. Results: The repair time and the early exposure incidence immediately after repair and 3 months after repair in the observation group were significantly higher than those of the control group (P＜0.05). There was no significant difference in early exposure incidence at 6 months after repair between two groups (P>0.05). The percentage of occlusal force of affected side in the observation group immediately after repair and 3 and 6 months after repair was higher than that of the contralateral side, but the percentage of occlusal force in the control group was lower than the contralateral side, and the difference was not statistically significant (P>0.05). After 12 months of repair, the proportion of adjacency, edges tightness and completeness of the restoration in the observation group was significantly higher than that in the control group (P<0.05), the SBI score (0.62 ± 0.12), GI score (1.34 ± 0.24) and subjective satisfaction score (44.87 ± 4.76) in the observation group were significantly better than those in the control group [SBI score (0.75 ± 0.11), GI score (1.48 ± 0.26) and subjective satisfaction score (38.84 ± 4.03)] (P <0.05). Conclusions: For patients with defect of posterior teeth, cast porcelain high inlays have better occlusal force distribution, lower gingival index and gingival groove bleeding index, higher repair effect, success rate and subjective satisfaction, but are poor in repair time and early exposure incidence compared with direct resin filling.

Key words: Direct Resin Filling Repairing, Cast Porcelain High Inlays Repairing, large defects, posterior teeth, Repairing Effect