Kamburoğlu Kıvanç, Sönmez Gül, Berktaş Zeynep Serap, Kurt Hakan, Özen Doĝukan
Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Department of Biostatistics, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey.
Imaging Sci Dent. 2017 Jun;47(2):109-115. doi: 10.5624/isd.2017.47.2.109. Epub 2017 Jun 22.
The aim of this study was to assess the ex vivo diagnostic ability of 9 different cone-beam computed tomography (CBCT) settings in the detection of recurrent caries under amalgam restorations in primary teeth.
Fifty-two primary teeth were used. Twenty-six teeth had dentine caries and 26 teeth did not have dentine caries. Black class II cavities were prepared and restored with amalgam. In the 26 carious teeth, recurrent caries were left under restorations. The other 26 intact teeth that did not have caries served as controls. Teeth were imaged using a 100×90-mm field of view and a 0.2-mm voxel size with 9 different CBCT settings. Four observers assessed the images using a 5-point scale. Kappa values were calculated to assess observer agreement. CBCT settings were compared with the gold standard using a receiver operating characteristic analysis. The area under the curve (AUC) values for each setting were compared using the chi-square test, with a significance level of α=.05.
Intraobserver kappa values ranged from 0.366 to 0.664 for observer 1, from 0.311 to 0.447 for observer 2, from 0.597 to 1.000 for observer 3, and from 0.869 to 1 for observer 4. Furthermore, interobserver kappa values among the observers ranged from 0.133 to 0.814 for the first reading and from 0.197 to 0.805 for the second reading. The highest AUC values were found for setting 5 (0.5916) and setting 3 (0.5886), and were not found to be statistically significant (>.05).
Variations in tube voltage and tube current did not affect the detection of recurrent caries under amalgam restorations in primary teeth.
本研究旨在评估9种不同的锥形束计算机断层扫描（CBCT）设置在检测乳牙汞合金修复体下继发龋方面的体外诊断能力。
使用了52颗乳牙。26颗牙齿有牙本质龋，26颗牙齿没有牙本质龋。制备了Ⅱ类黑色洞型并用汞合金修复。在26颗龋坏牙齿中，修复体下保留继发龋。另外26颗无龋的完整牙齿作为对照。使用100×90毫米视野和0.2毫米体素大小，通过9种不同的CBCT设置对牙齿进行成像。4名观察者使用5分制对图像进行评估。计算kappa值以评估观察者间的一致性。使用受试者工作特征分析将CBCT设置与金标准进行比较。使用卡方检验比较每种设置的曲线下面积（AUC）值，显著性水平α = 0.05。
观察者1的观察者内kappa值范围为0.366至0.664，观察者2为0.311至0.447，观察者3为0.597至1.000，观察者4为0.869至1。此外，观察者间的第一次读数的kappa值范围为0.133至0.814，第二次读数为0.197至0.805。设置5（0.5916）和设置3（0.5886）的AUC值最高，且未发现具有统计学显著性（>0.05）。
管电压和管电流的变化不影响乳牙汞合金修复体下继发龋的检测。
