Charuakkra Arnon, Prapayasatok Sangsom, Janhom Apirum, Pongsiriwet Surawut, Verochana Karune, Mahasantipiya Phattaranant
Division of Oral and Maxillofacial Radiology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.
Imaging Sci Dent. 2011 Dec;41(4):143-50. doi: 10.5624/isd.2011.41.4.143. Epub 2011 Dec 19.
The aim of this study was to compare the diagnostic accuracy of cone-beam computed tomography (CBCT) images and bitewing images in detection of secondary caries.
One hundred and twenty proximal slots of Class II cavities were randomly prepared on human premolar and molar teeth, and restored with amalgam (n=60) and composite resin (n=60). Then, artificial secondary caries lesions were randomly created using round steel No. 4 bur. The teeth were radiographed with a conventional bitewing technique and two CBCT systems; Pax-500ECT and Promax 3D. All images were evaluated by five observers. The area under the receiver operating characteristic (ROC) curve (A(z)) was used to evaluate the diagnostic accuracy. Significant difference was tested using the Friedman test (p value<0.05).
The mean A(z) values for bitewing, Pax-500ECT, and Promax 3D imaging systems were 0.882, 0.995, and 0.978, respectively. Significant differences were found between the two CBCT systems and film (p=0.007). For CBCT systems, the axial plane showed the greatest A(z) value.
Based on the design of this study, CBCT images were better than bitewing radiographs in detection of secondary caries.
本研究旨在比较锥形束计算机断层扫描（CBCT）图像和咬合翼片图像在检测继发龋方面的诊断准确性。
在人类前磨牙和磨牙上随机制备120个II类洞邻面洞，分别用银汞合金（n = 60）和复合树脂（n = 60）进行修复。然后，用4号圆钢钻随机制作人工继发龋损。使用传统咬合翼片技术和两种CBCT系统（Pax - 500ECT和Promax 3D）对牙齿进行放射成像。所有图像由五名观察者进行评估。采用受试者操作特征（ROC）曲线下面积（A(z)）评估诊断准确性。使用Friedman检验（p值<0.05）检验显著差异。
咬合翼片、Pax - 500ECT和Promax 3D成像系统的平均A(z)值分别为0.882、0.995和0.978。两种CBCT系统与胶片之间存在显著差异（p = 0.007）。对于CBCT系统，轴向平面显示出最大的A(z)值。
基于本研究的设计，CBCT图像在检测继发龋方面优于咬合翼片X线片。
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