Duncalf W V, Wilson N H
University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH, England.
Quintessence Int. 2001 May;32(5):391-5.
The purpose of this study was to compare and contrast the performance, in terms of marginal adaptation, of a non-gamma-2 amalgam alloy with a compact-filled light-cured composite in the restoration of Class II preparations of conservative design.
Fifty recently extracted teeth were selected for the study. The teeth were restored with either a non-gamma-2 amalgam alloy, Dispersalloy, or a compact-filled resin composite, Z100, using standard techniques. The marginal adaptation of the restorative materials to the proximal surface outline form of each preparation was assessed at magnification x30.
Highly significant differences were demonstrated in the mean percentages of perfect margins in all 3 segments of the proximal boxes of the restorations with the resin composite performing significantly better than the amalgam. The percentages of marginal fissuring were significantly higher in the amalgam restorations, except at the cervical margin, where the incidence of fissuring was almost the same for the amalgam and resin composite restorations. The resin composite restorations had significantly fewer underfilled margins than the amalgam restorations.
In the conservative Class II preparations, the amalgam restorations were of poor quality with respect to marginal adaptation, compared with the resin composite restorations. It is suggested that the use of amalgam as a control in a clinical evaluation of resin composite restorations in conservative preparations cannot be justified, because it is apparently not possible to compare restorations of equivalent initial quality.
本研究旨在比较和对比一种非γ-2汞合金与致密填充光固化复合树脂在保守设计的Ⅱ类洞修复中边缘适合性方面的性能。
选择50颗近期拔除的牙齿用于本研究。使用标准技术，用非γ-2汞合金（Dispersalloy）或致密填充树脂复合材料（Z100）对牙齿进行修复。在30倍放大倍数下评估修复材料与每个洞型近中面外形的边缘适合性。
在修复体近中盒所有3个部分的完美边缘平均百分比方面显示出高度显著差异，树脂复合材料的表现明显优于汞合金。汞合金修复体边缘裂隙的百分比显著更高，除了在颈缘，汞合金和树脂复合材料修复体的裂隙发生率几乎相同。树脂复合材料修复体未充满边缘显著少于汞合金修复体。
在保守的Ⅱ类洞修复中，与树脂复合材料修复体相比，汞合金修复体在边缘适合性方面质量较差。建议在保守修复中对树脂复合材料修复体进行临床评估时，以汞合金作为对照是不合理的，因为显然无法比较初始质量相当的修复体。
