Sousa Melo Saulo Leonardo, Belem Manuella Dias Furtado, Prieto Lucia Trazzi, Tabchoury Cinthia Pereira Machado, Haiter-Neto Francisco
Clinical Assistant Professor, Department of Oral Pathology, Radiology and Medicine, College of Dentistry, University of Iowa, Iowa City, IA, USA.
Research Scholar, Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2017 Sep;124(3):306-314. doi: 10.1016/j.oooo.2017.05.469. Epub 2017 May 11.
The aim of this study was to compare the performance of cone beam computed tomography (CBCT) and digital radiography in the detection of artificial recurrent caries-like lesions under amalgam and composite fillings.
The study included class II cavities in 30 molars that had been filled with amalgam. Fifteen of those molars had the restoration-enamel interface artificially demineralized. Phantoms were prepared, and CBCT images were acquired with 2 units in 3 voxel sizes (K9000, 0.076 mm; i-CAT, 0.2 mm and 0.4 mm). Intraoral radiographs were obtained with 3 systems (Digora, VistaScan, and RVG-6100). Amalgam fillings were then replaced by composite, and new images were obtained. Three examiners assessed all of the images. Sensitivity, specificity, accuracy, and receiver operating characteristic curve were calculated and verified through analysis of variance and the Tukey test.
There were no significant differences in sensitivity and specificity when the same restorative material was present or when the restorative materials were compared with the imaging technique as a constant. As for accuracy and receiver operating characteristic curve, there were statistically significant differences when the 2 materials were compared, and there were differences in the amalgam group when the imaging modalities were compared.
CBCT performed similarly to intraoral radiography in detecting demineralization under restorations. However, the voxel size and the type of restorative material influenced its performance.
本研究旨在比较锥形束计算机断层扫描（CBCT）和数字化X线摄影在检测汞合金和复合树脂充填物下方人工再发性龋样病变方面的性能。
该研究纳入了30颗已用汞合金充填的磨牙中的Ⅱ类洞。其中15颗磨牙的修复体 - 牙釉质界面被人工脱矿。制备了模型，并使用2台设备以3种体素尺寸（K9000，0.076毫米；i - CAT，0.2毫米和0.4毫米）获取CBCT图像。使用3种系统（Digora、VistaScan和RVG - 6100）获取口腔内X线片。然后将汞合金充填物替换为复合树脂，并获取新的图像。三名检查者评估了所有图像。通过方差分析和Tukey检验计算并验证了敏感性、特异性、准确性和受试者工作特征曲线。
当存在相同修复材料时，或当将修复材料与成像技术作为常量进行比较时，敏感性和特异性没有显著差异。至于准确性和受试者工作特征曲线，当比较两种材料时存在统计学显著差异，并且在比较成像方式时汞合金组存在差异。
在检测修复体下方的脱矿方面，CBCT的表现与口腔内X线摄影相似。然而，体素尺寸和修复材料类型会影响其性能。
