Jafarzadeh Mansour, Ansari Saeed, Sharifishoshtari Sanaz
Department of Endodontics, School of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Department of Oral and Maxillofacial Radiology, School of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Dent Res J (Isfahan). 2022 Jan 28;19:7. doi: 10.4103/1735-3327.336692. eCollection 2022.
Cone-beam computed tomography (CBCT) has the highest sensitivity and specificity for the detection of vertical root fractures (VRFs). This study aimed to compare the diagnostic accuracy of CBCT with different gamma values for the detection of VRFs.
In this , experimental study, multiplanar CBCT scans were obtained from 61 extracted premolars with prefabricated titanium posts using NewTom CBCT scanner. Next, VRFs were artificially induced in all teeth with a mallet, and the teeth underwent CBCT with three different gamma values. The images were evaluated by two observers twice with a 2-week interval for the presence/absence of VRFs. Data were analyzed using the kappa coefficient, McNemar test, and Chi-square test. The sensitivity, specificity, and overall accuracy of CBCT with different gamma values for the detection of VRFs were assessed by receiver operating characteristic curve. The level of significance was lesser than 0.05 ( < 0.05).
Changing the gamma value did not change the sensitivity, specificity, or accuracy of CBCT for the detection of VRFs. No significant difference was noted between the two observers in the detection of VRFs on CBCT scans taken with different gamma grades. The inter- and intra-observer agreement were excellent for all gamma grades.
Any gamma value preferred by the observer can be used for the detection of VRFs on CBCT scans.
锥形束计算机断层扫描（CBCT）在检测垂直根折（VRF）方面具有最高的敏感性和特异性。本研究旨在比较不同伽马值的CBCT对VRF的诊断准确性。
在本实验研究中，使用NewTom CBCT扫描仪对61颗带有预制钛桩的拔除前磨牙进行多平面CBCT扫描。接下来，用木槌人工诱导所有牙齿发生VRF，并对牙齿进行三种不同伽马值的CBCT扫描。由两名观察者对图像进行两次评估，间隔2周，观察是否存在VRF。使用kappa系数、McNemar检验和卡方检验对数据进行分析。通过受试者工作特征曲线评估不同伽马值的CBCT对VRF的检测敏感性、特异性和总体准确性。显著性水平小于0.05（<0.05）。
改变伽马值并未改变CBCT检测VRF的敏感性、特异性或准确性。在不同伽马等级的CBCT扫描中，两名观察者在检测VRF方面未发现显著差异。所有伽马等级的观察者间和观察者内一致性都非常好。
观察者偏好的任何伽马值均可用于CBCT扫描中VRF的检测。
