Jokstad A, Mjör I A
Department of Anatomy, School of Dentistry, University of Oslo, Norway.
Acta Odontol Scand. 1991 Feb;49(1):15-25. doi: 10.3109/00016359109041136.
The study aimed to validate the scoring of the degree of marginal degradation of amalgam restorations by using impressions, as an alternative to other indirect scoring methods using photographs or casts. Ten-year-old condensation silicone elastomer impressions and epoxy replicas made in 1979 were compared in a scanning electron microscope at 5 kV with different magnifications up to x200. The impression material was not distorted or degraded, and the dimensional stability was good after 10 years of storage in a dry environment. The inter-examiner agreement of the scorings of impressions and a six-point scale reference set was satisfactory as evaluated by kappa statistics, demonstrating that degrees of marginal degradation can be distinguished on impressions with relatively high accuracy. The rating distribution of the scorings of impressions showed good correlation to the rating distributions obtained with the clinical USPHS rating method and with photographs for recording marginal degradation. A slight difference between the photographic and impression ratings at the upper and lower levels of the six-point rating scale was observed. The difference varied with the type of alloy, possibly due to a bias depending on the surface quality--that is, whether the restoration kept the glossiness of high polishing or became heavily tarnished.
该研究旨在验证通过使用印模来评估汞合金修复体边缘降解程度的评分方法，作为使用照片或模型的其他间接评分方法的替代方法。将1979年制作的10年期缩合型硅橡胶印模和环氧树脂复制品在扫描电子显微镜下于5 kV电压下以高达200倍的不同放大倍数进行比较。印模材料未变形或降解，在干燥环境中储存10年后尺寸稳定性良好。通过kappa统计评估，检查者之间对印模评分和六点量表参考集的一致性令人满意，表明可以在印模上以相对较高的准确性区分边缘降解程度。印模评分的等级分布与采用临床USPHS评分方法以及记录边缘降解的照片所获得的等级分布具有良好的相关性。在六点评分量表的上下限处，观察到照片评分和印模评分之间存在细微差异。该差异因合金类型而异，可能是由于取决于表面质量的偏差所致，也就是说，修复体是保持了高度抛光的光泽度还是变得严重 tarnished。（注：tarnished这个词原文可能有误，推测应该是“tarnished”，意为“失去光泽的、生锈的”，这里直接保留原文单词）
