This study aimed to compare the sensitivity of radiographs and flat-panel volume-computed tomography (fpVCT) in detecting the remaining root-canal filling material. Thirty-two root canals in extracted human mandibular molars were prepared and obturated with gutta-percha and sealer. The filling material was removed, and the teeth were split longitudinally. Radiographs and fpVCT scans were obtained and digitized. Virtual images were developed using reconstruction software and then superimposed, and the remaining filling material was outlined. Direct observation of the split root halves using flatbed scans served as a control. The presence and extension of the remaining filling material were evaluated. Statistical analysis was conducted using chi-squared test (P < 0.05). A total of 116 remnants were detected in the flatbed scans, 81 in the fpVCT scans, and 90 in the radiographs, with no significant difference between the radiograph (78%) and fpVCT (70%) results (P = 0.18). In the fpVCT scans, 42% of the remnants exhibited the same dimensions as the control, whereas 27% appeared larger and 30% appeared smaller. In the radiographs, the dimensions of the remnants were identical to the control in 64% of cases, smaller in 29%, and larger in 7%. FpVCT did not exhibit better performance than dental radiographs in detecting the remaining root-canal-filling material: the extension of remnants was indicated correctly in the fpVCT in fewer than 50% of the samples.

这项研究的目的是比较放射线照片和平板体积计算机断层扫描（fpVCT）在检测剩余的根管充填材料中的敏感性。准备在提取的人类下颌磨牙中的32条根管，并用牙胶和密封胶封闭。去除填充材料，并且将牙齿纵向裂开。获得了射线照片和fpVCT扫描并数字化。使用重建软件开发虚拟图像，然后将其叠加，并勾勒出剩余的填充材料。使用平板扫描仪直接观察裂根的一半。评估剩余填充材料的存在和扩展。使用卡方检验（P<0.05）。在平板扫描中共检测到116残留物，在fpVCT扫描中检测到81残留物，在X线照片中检测到90残留物，X线照片（78％）和fpVCT（70％）结果之间无显着差异（P = 0.18）。在fpVCT扫描中，有42％的残留物显示与对照相同的尺寸，而27％的残留物显示较大，而30％的显示较小。在X射线照片中，残余物的尺寸在64％的病例中与对照组相同，在29％的病例中较小，在7％的病例中较大。FpVCT在检测残留的根管充填材料方面没有表现出比牙科X光片更好的性能：在fpVCT中，少于50％的样品正确显示了残留物的延伸。