CAD/CAM으로 제작된 세라믹 인레이의 변연 및 내면 적합성
MARGINAL AND INTERNAL FIT OF CAD/CAM-MANUFACTURED CERAMIC INLAY
손호현,
소속 상세정보
손호현 ( ) - 서울대학교 치과대학 치과보존학교실
KMID : 0362319980230020618
Abstract
CAD/CAM-fabricated ceramic restorations nowadays are used as alternatives of amlagam and posterior composite resin restorations, ,espesially in the cases of inlay restorations. But´. the reported results on marginal and internal fit of CAD/CAM-fabricated ceramic inlay have showed considerable difference. In this study, to evaluate the marginal and internal fit of CEREC2-fabricated ceramic inlay restoration and to compere with the fit of gold inlay and amalgam restoration, standardized Class II MO cavities were prepared in forty extracted caries-free human premolars. The teeth with prepared cavities were divided into 4 groups of ten teeth each. In group 1, CEREC2-fabricated ceramic inlays were treated with Scotchbond Multi-Purpose Plus(SMP plus) and cemented with Scotchbond Resin Cement. In group 2, tasted gold inlays were cemented in the same method as in group 1. In group 3, carted gold inlays were cemented with zinc-phosphate cement. And in group 4, the pre-pared cavities were restored with amalgam. Restored teeth were thermocycled, stored in 1% methylene blue for 24 hours, and sectioned faciolingually and mesiodistally using EXAKT. Sectioned surfaces were observed with stereomicroscope and the gaps were measured at 9 points of mesiodistally sectioned surface and 7 points of faciolingually sectioned surface. The measured data were treated by Kruskal-Wallis one way ANOVA and Student-Newman-Keuls test.
1. The differences among measured gaps at each points were statistically significant for 4 experimental groups (P<0.05).
2. There were statistically significant differences in the measured gaps at each points between group 1 and group 2, group 1 and group 3, group 1 and group 4, group 2 and group 4, and group 3 and group 4 (P<0.05).
3. There were not statistically significant differences in the measured gaps at each points between group 2 and group 3 (P>0.05).
4. In the cases of inlay restorations (group 1, group 2, gruop 3), the gaps at internal line angle(distopulpal, axiogingival, faciopulpal, linguopulpal line angle) had a tendency to in-crease. In the cases of amalgam restorations (group 4), the gaps at occlusal margin, gingival margin and axiogingival line angle were greater than those at the other parts of cavities.
5. In CEREC2-fabricated ceramic inlays which were treated with Scotchbond Multi-Purpose Plus´ and cemented with Scotchbond Resin Cement, the mean gaps were 111㎛ at cavity margins, 168㎛ at vertical walls of cavities, 225㎛ at internal line angles and 123㎛
m at cavity floors.
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