Rudolphy M P, van Amerongen J P, ten Cate J M
Department of Cariology and Endodontology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.
Caries Res. 1994;28(4):240-5. doi: 10.1159/000261972.
Radiopacities, caused by tin or zinc deposits in partly demineralized dental tissue, are frequently seen under amalgam restorations. The aim of this study was to determine to what extent these radiopaque areas could be identified by Caries Detector (1% acid red in propylene glycol) which is claimed to stain the irreversibly demineralized dentine. Twenty-eight extracted teeth showing radiopacities under amalgam fillings were selected. The restorations were removed, and Caries Detector was applied. Caries was excavated until the dentine did no longer stain with the Caries Detector. Standardized radiographs were taken at different stages. In all teeth the radiopaque areas stained with the Caries Detector. Visual inspection of the radiographs, taken after excavation, revealed that the radiopacities had disappeared completely in 6 teeth; in 5 teeth a very small part of the radiopaque area remained; in 17 teeth the cavity floor appeared as a thin white line on X-ray. Overall, line scan analysis confirmed the data obtained by visual observation. The residual radiopacities and radiopaque lines were a very small fraction of the initial radiopacities. Therefore, it is concluded that the radiopaque zone under amalgam fillings represents almost entirely an area of irreversibly demineralized dentine as indicated by the Caries Detector.
在部分脱矿的牙体组织中，由锡或锌沉积导致的射线阻射影像，在汞合金修复体下方经常可见。本研究的目的是确定龋病检测仪（1%酸性品红丙二醇溶液）能够在多大程度上识别这些射线阻射区域，该检测仪据称可对不可逆脱矿的牙本质进行染色。选取了28颗在汞合金充填物下方显示有射线阻射影像的离体牙。去除修复体，应用龋病检测仪。去除龋坏组织，直到牙本质不再被龋病检测仪染色。在不同阶段拍摄标准化X线片。在所有牙齿中，射线阻射区域均被龋病检测仪染色。在去除龋坏组织后拍摄的X线片的目视检查显示，6颗牙齿中的射线阻射影像完全消失；5颗牙齿中射线阻射区域的一小部分仍然存在；17颗牙齿的洞底在X射线下呈现为一条细白线。总体而言，线扫描分析证实了目视观察获得的数据。残留的射线阻射影像和射线阻射线仅占初始射线阻射影像的很小一部分。因此，得出结论，汞合金充填物下方的射线阻射区几乎完全代表了龋病检测仪所示的不可逆脱矿牙本质区域。
