V급 와동 변연부 형태 및 복합레진 종류에 따른 변연누출에 관한 실험적 연구
An Experimental Study on the Effects of the Margin Designs and Composite Resins of the marginal Leakage of Class V. Resin Restorations
신용필, 홍승록, 유동훈, 박정미,
소속 상세정보
신용필 ( ) - 연세대학교
홍승록 ( ) - 연세대학교
유동훈 ( ) - 연세대학교
박정미 ( ) - 연세대학교
KMID : 0362319860120010107
Abstract
The primary aim of this study was to assess the effects of the margin designs and composite resins on the marginal leakage of Class V resin restorations. 60 Class V cavities with 90˚ butt joint, 60 with 45˚ bevel joint, 60 with concave joint were prepared on the labial surfaces of 38 extracted anterior teeth and the buccal and ligual surfaces of 71 premolars, and classified as the butt group, bevel group and concave group, respectively. After completion of the cavity preparation, Heliosit^� was filled in 20 butt joint cavities, 20 bevel joint cavities, 20 concave cavities. And Hi-Pol^� and Palfique^� were filled in the same manner, respectively.
After finishing, all specimens were subjected manually to 50 thermal cycles at 4℃, 37℃, and 60℃. They were immersed in 0.5％ methylene blue solution for 24 hours, and buccolingually sectioned with sectioning machine. The sectioned specimens were examined under the light microscope.
The results indicated the following :
1. The bevel group showed the least amount of marginal leakage compared with the other two design groups, but the statistical analysis showed no significant difference at the 95％ confidence level.
2. Hi-Pol^� group showed the most severe marginal leakage compared with the other composite resin materials, but there was no significant difference in the groups.
3. The bevel-Heliosit^� subgroup, which was filled with Heliosit^� in the beveled cavities, showed the least amount of marginal leakage, but there was no significance in all the subgroups.
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