Karadeniz Technical University, Faculty of Dentistry, Department of Orthodontics, 61080 Trabzon, Turkey.
Eur J Radiol. 2012 Aug;81(8):1812-6. doi: 10.1016/j.ejrad.2011.04.070. Epub 2011 Jun 15.
The aim was to determine the accuracy of volumetric analysis of the mandibular condyle using cone-beam computed tomography (CBCT).
Five dry mandibles containing 9 condyles were used. CBCT scans of the mandibles and an impression of each condylar area were taken. The physical volumes of the condyles were calculated as the gold standard using the water displacement technique. After isolating, the condylar volume was sectioned in the sagittal plane, and 0.3mm thick sections with 0.9mm intervals were obtained from 3D reconstructions. Using the Cavalieri principle, the volume of each condyle was estimated from the CBCT images by three observers. The accuracy of the CBCT volume measurements and the relation agreements between the results of the three observers were assessed using the Wilcoxon Signed Rank test and Pearson correlation test. The level of statistical significance was set at 0.05.
The results of the Pearson correlation showed that there were highly significant positive correlations between the observers' measurements. According to the results of the Wilcoxon Signed Rank test comparing the physical and observers' measurements, there were no statistically significant differences (p>0.05).
The Cavalieri principle, used in conjunction with a planimetry method, is a valid and effective method for volume estimation of the mandibular condyle on CBCT images.
旨在确定使用锥形束 CT（CBCT）对下颌骨髁突进行容积分析的准确性。
使用 5 个含有 9 个髁突的干燥下颌骨。对下颌骨进行 CBCT 扫描，并对每个髁突区域进行印模。使用排水法计算髁突的物理体积作为金标准。在隔离后，将髁突在矢状面进行分段，从 3D 重建中获得 0.3mm 厚、间隔 0.9mm 的切片。使用 Cavalieri 原理，三位观察者从 CBCT 图像中估算每个髁突的体积。使用 Wilcoxon 符号秩检验和 Pearson 相关检验评估 CBCT 体积测量的准确性和三位观察者结果之间的关系一致性。统计显著性水平设为 0.05。
Pearson 相关分析的结果表明，观察者之间的测量值存在高度显著的正相关。根据 Wilcoxon 符号秩检验比较物理测量值和观察者测量值的结果，没有统计学差异（p＞0.05）。
结合平面测量法，Cavalieri 原理是一种在 CBCT 图像上估算下颌骨髁突体积的有效方法。
