레진전색제의 마모저항성에 대한 평가

Abstract

The purpose of this study was to evaluate the abrasion resistance of composite resin surface which was applied a resin surface sealant, and to provide proper time to reapply sealant on composite resin surface. Two hundred rectangular specimens, sized 8×3×2 mm, were of Micronew (Bisco, Inc., Schaumburg, IL, U.S.A) and divided into two groups; F group (n=10) was finished with coarse and medium grit of Sof-Lex disc and B group (n=190) was applied BisCover after finishing with discs. B group was again subdivided into nineteen subgroups. B-IM group was not subjected to toothbrush abrasion test. From B-1 group to B-18 group were subjected to toothbrush abrasion test using a distilled water-dentifrice slurry and toothbrush heads. Average surface roughness (Ra) of each group was claculated using a surface roughness tester (Surfcorder MSE-1700: Kosaka Laboratory Ltd., Tokyo, Japan). A representative specimen of each group was examined by FE-SEM (S-4700: Hitachi High Technologies Co., Tokyo, Japan ). The data were analysed using cluster analysis, paired t-test, and repeated measure ANOVA. The results of this study were as follows; 1. Ra of F group was 0.898 ± 0.145 ㎛ and B-IM group was 0.289 ± 0.142 ㎛. Ra became higher from B-1 group (0.299± 0.48 ㎛) to B-18 group ( 0.642 ± 0.313 ㎛). 2. Final cluster center of Ra was 0.361 ㎛ in cluster 1(B-IM~B-7), 0.511 ㎛ in cluster 2 (B-8~B-14) and 0.624 ㎛ in cluster 3 (B-15~B-18). there was statistically significant among Ra of three clusters. 3. Ra of B-IM group was decreased 210.72% than Ra of F group, Ra of B-8 group and B-15 group was increased 35.49% and 51.35% respectively than Ra of B-IM group. 4. On FE-SEM, B-IM group showed the smoothest resin surface. B-8 group and B-15 group showed vertically shallow scratches, and wide and irregular vertical scratches on composite resin surface respectively. Within limitation of this study, finished resin surface will be again smooth and glazy if BisCover would be reapplied within 8 to 14 months after applying to resin surface.