Abstract: PURPOSE: The purpose of this study was to explore the effect of Hybrid-coat combined with composite resin filling on reducing hypersensitivity of dental wedge-shaped defect. METHODS: Seventy cases, 159 teeth with sensitive wedge-shaped defects were selected. The patients were randomly divided into 2 groups and treated as below: 35 cases, 81 teeth in group A were treated with Hybrid-coat combined with composite resin; 35 cases,78 teeth in group B were treated with composite resin directly. After treatments, the effective rates under clinical examination standard (immediately, 1, 3 and 6 months after filling) in both groups were collected and statistically analysed with SPSS 13.0 software package. RESULTS: In group A, one and 2 teeth fillings fell off 3 months and 6 months after treatments ,respectively. In group B, 2 teeth fillings fell off 6 months after operation. There was no significant difference between the two groups. The effective rate of desensitization was 91.36%, 88.89%, 79.01% and 70.37%, respectively, which was higher than those of group B (78.21%, 76.92%, 69.23% and 61.54%, respectively). There was significant difference between the two groups immediately and 1 months after treatment (P<0.05), but there was no significant difference between the two groups 3 months and 6 months after treatment. CONCLUSIONS: Hybrid-coat combined with composite resin is effective in reducing sensitivity of wedge-shaped defects.

Key words: Wedge-shaped defect, Hybrid coat, Tooth hypersensitivity