Oral Radiology Division, Department of Surgery and Orthopedics, Dental School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Oral Radiology Division, Department of Surgery and Orthopedics, Dental School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2020 Sep;130(3):322-327. doi: 10.1016/j.oooo.2020.03.046. Epub 2020 May 15.
The aim of this study was to evaluate the efficacy of different high-resolution cone beam computed tomography protocols in the diagnosis of chemically simulated external root resorption (ERR).
ERR was simulated in 3 sizes by using an acid decalcification protocol in the cervical, middle, and apical thirds of 30 single-rooted premolars. Four scans of each tooth were acquired with different voxel sizes: 0.080, 0.085, 0.120, and 0.133 mm. The images were analyzed by 2 blinded evaluators for the presence of ERR. The evaluation of diagnostic performance was based on receiver operating characteristic (ROC) curve analysis.
No statistically significant differences were found in the detection of ERR with regard to lesion sizes or the different root thirds. Areas under the ROC curve were 0.901, 0.892, 0.887, and 0.767 for voxel sizes of 0.080, 0.085, 0.120, and 0.133 mm, respectively. Voxel sizes of 0.080 and 0.085 mm presented significantly larger areas under the ROC curve compared with the voxel size of 0.133 mm. There were no statistically significant differences among the protocols with the use of voxel sizes of 0.080, 0.085, and 0.120 mm.
Cone beam computed tomography examinations with higher-resolution protocols demonstrated better performance in the diagnosis of ERR. Further investigations using simulations that more closely resemble the actual ERR process are warranted.
本研究旨在评估不同高分辨率锥形束 CT 方案在诊断化学模拟外吸收根（ERR）中的疗效。
通过酸脱钙方案在 30 颗单根前磨牙的颈、中、根尖三分之一处模拟 ERR，每种牙的大小为 3 种。对每个牙进行 4 次扫描，具有不同的体素大小：0.080、0.085、0.120 和 0.133mm。两位盲法评估员对 ERR 的存在进行了图像分析。诊断性能的评估基于接受者操作特征（ROC）曲线分析。
在检测 ERR 方面，病变大小或不同根三分之一之间没有统计学上的显著差异。ROC 曲线下的面积分别为 0.080、0.085、0.120 和 0.133mm 体素大小的 0.901、0.892、0.887 和 0.767。体素大小为 0.080 和 0.085mm 的 ROC 曲线下面积明显大于体素大小为 0.133mm 的 ROC 曲线下面积。使用体素大小为 0.080、0.085 和 0.120mm 的方案之间没有统计学上的显著差异。
具有更高分辨率方案的锥形束 CT 检查在 ERR 诊断中表现出更好的性能。需要使用更接近实际 ERR 过程的模拟进一步进行研究。
