White S C, Yoon D C
UCLA School of Dentistry 90095, USA.
Dentomaxillofac Radiol. 1997 Jan;26(1):32-8. doi: 10.1038/sj.dmfr.4600208.
To evaluate the performance of a digital CCD system for detecting proximal surface caries compared with film.
Three hundred and twenty extracted human teeth were imaged by making direct digital (Schick Technologies, Inc) and conventional film images (E-speed) of each. A total of 16 experienced dentists scored the proximal surfaces of these teeth for the extent of enamel and dentin lesions. The teeth were subsequently sectioned to determine the actual caries depth.
The sensitivity of the CCD system was consistently lower than film while the specificity of the CCD system was consistently higher. The accuracy of CCD and film images was not significantly different, neither when sensitivity and specificity were averaged nor when accuracy was weighted to reflect caries prevalence of 2, 5 or 10%. The predictive values of both positive/negative outcomes were virtually identical for the CCD and film images. The interrater variability in lesion confidence scores with digital images was comparative with film.
Dentists using a direct digital CCD system performed as well in interpreting proximal surface caries as with E-speed film. This work suggests that for this task these two competing systems are diagnostically comparable.
评估数字电荷耦合器件（CCD）系统与胶片相比检测邻面龋的性能。
对320颗拔除的人类牙齿分别进行直接数字成像（施克技术公司）和传统胶片成像（E速胶片）。共有16名经验丰富的牙医对这些牙齿的邻面釉质和牙本质病变程度进行评分。随后将牙齿切片以确定实际龋深。
CCD系统的敏感性始终低于胶片，而其特异性始终较高。CCD图像和胶片图像的准确性无显著差异，无论是平均敏感性和特异性时，还是加权准确性以反映2%、5%或10%的龋病患病率时。CCD图像和胶片图像的阳性/阴性结果预测值几乎相同。数字图像的病变可信度评分的评估者间变异性与胶片相当。
使用直接数字CCD系统的牙医在解读邻面龋方面与使用E速胶片的牙医表现相当。这项研究表明，对于这项任务，这两种相互竞争的系统在诊断上具有可比性。
