Kidd E A, O'Hara J W
Department of Conservative Dentistry, United Medical School, London, England.
J Dent Res. 1990 Jun;69(6):1275-7. doi: 10.1177/00220345900690061001.
The purpose of this study was to examine histologically occlusal amalgam restorations with both defective and sound margins for comparison of their caries status. Thirty extracted teeth with occlusal amalgam restorations were sectioned so that a ditched and a clinically sound margin could be examined on the same tooth in the mouth. Histological examination showed a low prevalence of caries lesions in the outer enamel. However, lesions were present in the enamel of the cavity wall in 54% of specimens, whether the margin was defective or sound. If the results of this study are applicable to all occlusal amalgams with defective margins, it would appear that a defective margin alone is not an indication that a restoration needs to be replaced.
本研究的目的是对边缘有缺陷和完好的咬合面汞合金修复体进行组织学检查，以比较它们的龋病状况。对30颗有咬合面汞合金修复体的离体牙进行切片，以便在口腔内同一颗牙齿上检查一条沟状边缘和一条临床完好的边缘。组织学检查显示，外层牙釉质中龋损的发生率较低。然而，无论边缘是有缺陷还是完好，54%的标本的洞壁牙釉质中都存在病变。如果本研究结果适用于所有边缘有缺陷的咬合面汞合金修复体，那么似乎仅边缘有缺陷并不表明修复体需要更换。
