Hodges D J, Mangum F I, Ward M T
Department of Operative Dentistry, University of Texas Health Science Center at Houston Dental Branch, USA.
Community Dent Oral Epidemiol. 1995 Aug;23(4):200-4. doi: 10.1111/j.1600-0528.1995.tb00231.x.
This study examines the relationship between gap width and the presence of recurrent dental caries subjacent to occlusal margins of amalgam restorations. The study population consisted of 35 adult patients of the university's dental clinic who were having occlusal amalgam restorations removed solely because of defective margins. In this group, an impression was made recording the width of a clinically detected gap between the amalgam restoration and the adjacent enamel cavosurface. Of this study population, 20 teeth with recurrent caries were identified from 18 subjects after restoration removal. Upon removal of the restoration, the presence and location of recurrent dental caries associated with a margin was noted. The mean gap widths of recurrent carious sites and non-carious sites were compared in the same tooth. A difference of 187 microns was found between the mean gap width of the recurrent caries sites and the non-carious sites, with the recurrent caries gaps being wider. A paired t-test based on the differences was calculated (P < 0.0001). The results suggest that there is a direct association between gap width and recurrent caries in occlusal margins of amalgam restorations.
本研究探讨了汞合金修复体咬合边缘下方间隙宽度与复发性龋齿存在之间的关系。研究对象包括大学牙科诊所的35名成年患者，他们仅因边缘缺陷而要去除咬合汞合金修复体。在该组中，制作了印模，记录了临床上检测到的汞合金修复体与相邻牙釉质洞壁表面之间间隙的宽度。在该研究群体中，修复体去除后，从18名受试者中识别出20颗患有复发性龋齿的牙齿。去除修复体后，记录与边缘相关的复发性龋齿的存在情况和位置。比较同一颗牙齿中复发性龋损部位和非龋损部位的平均间隙宽度。发现复发性龋损部位和非龋损部位的平均间隙宽度相差187微米，复发性龋齿的间隙更宽。基于这些差异计算了配对t检验（P < 0.0001）。结果表明，汞合金修复体咬合边缘的间隙宽度与复发性龋齿之间存在直接关联。
