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KMID : 0362320070320030180
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Journal of Korean Academy of Operative Dentistry
2007 Volume.32 No. 3 p.180 ~ p.190
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EVALUATION ON THE ABRASION RESISTANCE OF A SURFACE SEALANT
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Kim Soo-Mee
Han Sae-Hee
Cho Young-Gon
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Abstract
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The purpose of this study was to evaluate the abrasion resistance of surface penetrating sealant which was applied on a composite resin restoration and to provide proper time to reapply sealant on composite resin surface. Two hundred rectangular specimens, sized 8 × 3 × 2mm, were made 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 discs and BisCoverwas applied B group (n = 190) after finishing with discs. B group was again subdivided into nineteen subgroups From B-1 group to B-18 group were subjected to toothbrush abrasion test using a distilled water-dentifrice slurry and toothbrush heads B-IM group was not subjected to toothbrush abrasion test. Average surface roughness (Ra) of each group was calculated 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 off group was 0.898 ± 0.145 mum and B-IM group was 0.289 ± 0.142 mum. Ra became higher from B-1 group (0.299 ± 0.48 mum to B-18 group (0.642 ± 0.313 mum. 2. Final cluster center of Ra was 0.361 mum in cluster 1 (B-1M~B-7), 0.511 mum in cluster 2 (B-8~B-14) and 0.624mum in cluster 3 (B-15~B-18). There were significant difference 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 a 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.
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KEYWORD
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Abrasion resistance, Resin surface sealant, Toothbrush abrasion test, Surface roughness, Finishing method, Polishing instrument
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