Abstract: PURPOSE: To analyze the repair effect of glass fiber post combined with zirconia all ceramic crown in tooth defects and explore the relevant factors affecting the therapeutic effect. METHODS: A total of 100 patients(142 teeth) with dental defects admitted to Shandong Provincial Chronic Disease Hospital from January 2018 to January 2021 were selected as the study subjects. They were divided into an experimental group (glass fiber post combined with zirconia all ceramic crown restoration) with 70 patients(98 teeth) and the control group (metal post combined with zirconium dioxide all ceramic crown) with 30 patients (44 teeth). Clinical follow-up was conducted 6 months after surgery to compare the differences in dental restoration effectiveness, gingival bleeding index (BI), plaque index (PLI), and probing depth (PD) between the two groups of patients. According to the 6-month postoperative repair effect of the experimental group, patients were divided into two groups: poor repair group and good repair group. Single factor and multi-factor analysis was used to analyze the factors affecting the repair effect of glass fiber post combined with zirconia all ceramic crown. Statistical analysis was performed with SPSS 22.0 software package. RESULTS: Six months after surgery, the proportion of grade A, grade B and grade C in the experimental group was 76.5%, 20.4% and 3.1%, respectively, while the control group was 50.0%, 40.0%, and 10.0%. The dental restoration effect in the experimental group was significantly better than that in the control group (P=0.008). Before surgery, there was no significant difference in BI, PLI and PD between the two groups of patients (P>0.05). Six months after treatment, the BI, PLI and PD in the experimental group were significantly lower than those in the control group(P<0.05). Compared with the group with good repair, the group with poor repair had a higher proportion of smoking and stepped broken end morphology (P<0.05). Using smoking (yes=1, no=0) and broken end shape (step shape=1, blade shape=0) as independent variables, and efficacy (poor repair group=1, good repair group=0) as dependent variables, logistic regression analysis showed the factors that smoking and broken end shape affected the treatment efficacy(P<0.05). CONCLUSIONS: Compared with metal post zirconium dioxide all ceramic crown restoration, glass fiber post combined with zirconium dioxide all ceramic crown restoration is more effective, but its restoration effect is affected by smoking and the shape of the broken end. Clinical intervention measures should be taken to improve the restoration effect.

Key words: Glass fiber pile, Zirconia all ceramic crown, Dental defects, Repair effect, Influential factor