Department of Dental Clinic, Dental School, Juiz de Fora Federal University, Bairro Martelos S/N, Juiz de Fora, Brazil.
Int Endod J. 2011 Mar;44(3):218-24. doi: 10.1111/j.1365-2591.2010.01802.x. Epub 2010 Oct 11.
To compare cone-beam computed tomography (CBCT) with periapical radiography for the identification of simulated endodontic complications.
Sixteen human teeth, in three mandibles, were submitted to the following simulated endodontic complications: G1) fractured endodontic file; G2) root perforation; G3) cast post with deviation; G4) external root resorption. Periapical radiographs were taken of each tooth at three different angles, and CBCT scan was taken. One calibrated examiner who was specialized in dental radiology interpreted the images. The results were analysed using the following scoring system: 0 - unidentified alteration; 1 - alteration identified with inaccurate diagnosis; and 2 - alteration identified with accurate diagnosis. Data were analysed using McNemar and Wilcoxon tests (alfa=0.05).
In the overall assessment, CBCT was superior when compared with periapical radiographs (P<0.05). When individual results on each complication were evaluated, CBCT was superior only in the identification of external root resorption (100% Score 2) (P<0.05).
Cone-beam computed tomography could be an alternative to periapical radiographs especially in the detection and assessment of external root resorption.
比较锥形束 CT（CBCT）与根尖片在诊断模拟根管治疗并发症方面的差异。
将 16 个人工牙分别置于 3 个下颌骨中，进行以下模拟根管治疗并发症实验：G1）折断的根管锉；G2）牙根穿孔；G3）铸造桩有偏差；G4）牙骨质外吸收。对每颗牙齿在三个不同角度拍摄根尖片，同时进行 CBCT 扫描。一位专门从事牙科放射学的校准检验员对图像进行解读。使用以下评分系统分析结果：0-未识别的改变；1-诊断不准确的改变；2-诊断准确的改变。使用 McNemar 和 Wilcoxon 检验（α=0.05）进行数据分析。
在总体评估中，CBCT 优于根尖片（P<0.05）。当评估每种并发症的个别结果时，CBCT 仅在识别牙骨质外吸收方面具有优势（100%评分 2）（P<0.05）。
锥形束 CT 可替代根尖片，特别是在检测和评估牙骨质外吸收方面。
