복합레진 수복물의 변연 미세누출에 관한 Biscover ™ 전색제의 효과

Abstract

The purpose of this study was to compare the effect on marginal leakage of a resin surface sealant (Biscover) applied before or after polymerization of composite resin to unsealed composite restorations. Thirty Class Ⅴ cavities with the occlusal margin in enamel and cervical margin in dentin or cementum were prepared on the buccal surfaces of sound extracted molars and restored with a microfilled light-cured composite resin (Micronew). Restorations were randomly assigned into one of three equal groups (n=10): a control group-no surface sealing, group 1-applied Biscover before polymerization of the composite resin, and group 2-applied Biscover after polymerization of the composite resin. Specimens were thermocycled, immersed in 2% methylene blue solution for 4 hours, sectioned longitudinally, and analyzed for leakage at the occlusal and gingival margins. The results of this study were as follows; 1. In sealed group, group 2 showed higher microleakage than group 1 at both occlusal and gingival margins, but there was not statistically different between two groups (p ＞ 0.05). 2. Unsealed control group showed a little higher microleakage than sealed group at occlusal margins, and a little higher or similar microleakage than sealed group at gingival margins (p ＞ 0.05) 3. Control group and group 2 showed significantly less microleakage at the occlusal margins, but group 1 showed not significantly different between microleakage at the occlusal and gingival margins Biscover may minimize microleakage at dentin and cementum margins of composite restorations, when it was applied on the cured resin surface.