Marginal and internal fit of nano-composite CAD/CAM restorations
박소현, 유연지, 신유진, 조병훈, 백승호,
소속 상세정보
박소현 ( Park So-Hyun ) - Seoul National University Dental Hospital
유연지 ( Yoo Yeon-Jee ) - Seoul National University School of Dentistry Department of Conservative Dentistry
신유진 ( Shin Yoo-Jin ) - Seoul National University School of Dentistry Department of Conservative Dentistry
조병훈 ( Cho Byeong-Hoon ) - Seoul National University School of Dentistry Department of Conservative Dentistry
백승호 ( Baek Seung-Ho ) - Seoul National University School of Dentistry Department of Conservative Dentistry
KMID : 1034420160410010037
Abstract
Objectives: The purpose of this study was to compare the marginal and internal fit of nano-composite CAD-CAM restorations.
Materials and Methods: A full veneer crown and an mesio-occluso-distal (MOD) inlay cavity, which were prepared on extracted human molars, were used as templates of epoxy resin replicas. The prepared teeth were scanned and CAD-CAM restorations were milled using Lava Ultimate (LU) and experimental nano-composite CAD/CAM blocks (EB) under the same milling parameters. To assess the marginal and internal fit, the restorations were cemented to replicas and were embedded in an acrylic mold for sectioning at 0.5 mm intervals. The measured gap data were pooled according to the block types and measuring points for statistical analysis.
Results: Both the block type and measuring point significantly affected gap values, and their interaction was significant (p = 0.000). In crowns and inlays made from the two blocks, gap values were significantly larger in the occlusal area than in the axial area, while gap values in the marginal area were smallest (p < 0.001). Among the blocks, the restorations milled from EB had a significantly larger gap at all measuring points than those milled from LU (p = 0.000).
Conclusions: The marginal and internal gaps of the two nano-composite CAD/CAM blocks differed according to the measuring points. Among the internal area of the two nano-composite CAD/CAM restorations, occlusal gap data were significantly larger than axial gap data. The EB crowns and inlays had significantly larger gaps than LU restorations.
키워드
Internal gap; Lava ultimate; Marginal gap; Nano-composite CAD/CAM blocks
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