상아질 접착제의 미세누출과 변연부 혼화층
MICROLEAKAGE AND MARGINAL HYBRID LAYER OF DENTIN ADHESIVES
소속 상세정보
조영곤
김영관/안종모
KMID : 0362320020270010034
Abstract
The purpose of this study was to compare microleakage and marginal hybrid layer in class V restorations using two one-bottle adhesives and one self-etching adhesive.
Class V cavity preparations with occlusal margins in enamel and gingival margins in dentin were prepared on buccal and lingual surfaces of 30 extracted human molar teeth. Prepared teeth were randomly divided into there treatment groups (n=30) and restored with three adhesives and composites: Single Bond/Filtek Z-250 (Group 1), Prime&BondNT/EsthetㆍX(Group 2), Unifil Bond/Unifil F (Group 3).
For microleakage, samples were stored in room temperature water for 24 hours, thermocycled, stained with 2% methylene blue dye, sectioned into halves, scored and analysed using Mann-whitney test and Wilcoxon singed rank sum test.
For marginal hybrid layer, samples were sectioned into halves with 10% phosphoric acid for 5 seconds, stored in 5% NaOCL solution for 24 hours, dried and gold coated. Occlusal and gingival margins of each sample were inspected under SEM.
The results of this study were as follows;
1. Microleakage at the occlusal margins was not evident in group 1 and group 2, but it showed in group 3(p<0.05).
2. Microleakage in group 1 and group 3 was significantly lower than in group 2 at gingival margins (p<0.05).
3. Microleakage at gingival margins was greater than at occlusal margins in group 1 and group 2, but microleakage at occlusal margins was greater than at gingival margins in group 3 (p<0.05).
4. In group 1 and group 2, no gaps at occlusal margins showed. But gaps showed in group 3. Occlusal margins were free from a hybrid layer in all groups.
5. The thickness of the marginal hybrid layers was 2.5~5㎛ thick in group 5㎛ thick in group 2 and 1.5㎛ thick in group 3.
6. There was no corelation between microleakage and thickness of marginal hybrid layer.
In coclusion, the effect of dentin adhesives on microleakge in class V composite restorations was excellent when one-bottle adhesives were applied on enamel margin, and it was good when a self-etching adhesive was applied on dentinal margin. There was no corelation between microleakage and thickness of marginal hybrid layer.
Microleakage Marginal hybrid layer One-bottle adhesives Self-etching adhesive
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