Buchanan S A, Jenderseck R S, Granet M A, Kircos L T, Chambers D W, Robertson P B
Department of Stomatology, University of California San Francisco, School of Dentistry 94143-0422.
J Periodontol. 1987 Nov;58(11):747-51. doi: 10.1902/jop.1987.58.11.747.
To determine the sensitivity and specificity of the radiographic detection of calculus, 275 proximal tooth surfaces from 18 patients were evaluated. Standardized periapical radiographs obtained before extraction were coded, batch processed, and evaluated independently by two investigators under optimum viewing conditions. After extraction, the teeth were photographed and evaluated both microscopically and by planimetry on 40 X linear projections. Evaluation of calculus by conventional radiography showed low sensitivity: radiographic deposits were detected on only 44% of surfaces that demonstrated calculus microscopically. Specificity was high and the rate of false positives was only 7.5%. Detection of calculus was influenced by the thickness of calculus, the percentage of root surface occupied by calculus, and by tooth type; but not by attachment loss, probing depth, proximal surface, or arch location. These results show that present radiographic techniques are not appropriate for detecting calculus on root surfaces.
为确定X线片检测牙结石的敏感度和特异度，对18例患者的275个近中牙面进行了评估。在拔牙前获取标准化根尖片，进行编码、批量处理，并由两名研究者在最佳观片条件下独立评估。拔牙后，对牙齿进行拍照，并在40倍线性投影下进行显微镜检查和平面测量评估。传统X线片对牙结石的评估显示敏感度较低：在显微镜下显示有牙结石的表面中，仅44%在X线片上检测到有沉积物。特异度较高，假阳性率仅为7.5%。牙结石的检测受牙结石厚度、牙结石占据根面的百分比以及牙齿类型的影响；但不受附着丧失、探诊深度、近中面或牙弓位置的影响。这些结果表明，目前的X线片技术不适用于检测根面上的牙结石。
