Almeshari Ahmed, Abdelkarim Ahmed Z, Geha Hassem, Khan Asma A, Ruparel Nikita
Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, Najran University, Najran, SAU.
Division of Oral and Maxillofacial Radiology, The Ohio State University College of Dentistry, Columbus, USA.
Cureus. 2023 Mar 1;15(3):e35647. doi: 10.7759/cureus.35647. eCollection 2023 Mar.
This study aims to examine the accuracy of cone-beam computed tomography (CBCT) machines in detecting root fracture when using different metal artifact reduction (MAR) settings at different kilovoltage peak (kVp) levels.
Sixty-six tooth roots were treated endodontically using a standardized technique. Of these, 33 roots were randomly selected to be fractured; the other 33 roots were intact and used as controls. The roots were placed randomly in prepared beef ribs to mimic the alveolar bone. Imaging was performed by Planmeca ProMax® 3D (Planmeca, Helsinki, Finland) using different MAR settings (no, low, mid, and high) at three different levels of kVp: 70, 80, and 90. Sensitivity, specificity, and area under the receiver operating characteristic curve (AUC) were calculated.
There was a significant difference in accuracy when using different MAR settings within the group of 70 kVp. Likewise, within the group of 90 kVp. There was no significant difference between different MAR settings at 80 kVp. Using low MAR/90 kVp had significantly higher accuracy relative to other MAR settings at 90 kVp; it also had the highest values of sensitivity, specificity, and AUC in the study. Using mid and high MAR at 70 kVp or 90 kVp decreased accuracy significantly. Mid MAR/90 kVp was the least effective setting in this study.
Using low MAR at 90 kVp significantly increased the accuracy within the group of 90 kVp. In contrast, mid MAR and high MAR in 70 and 90 kVp, respectively, decreased accuracy significantly.
本研究旨在检测锥形束计算机断层扫描（CBCT）机器在不同管电压峰值（kVp）水平下使用不同金属伪影减少（MAR）设置时检测牙根骨折的准确性。
采用标准化技术对66颗牙根进行根管治疗。其中，随机选择33颗牙根使其骨折；另外33颗牙根保持完整作为对照。将牙根随机放置在准备好的牛肋骨中以模拟牙槽骨。使用Planmeca ProMax® 3D（芬兰赫尔辛基普兰梅卡公司）在三种不同的kVp水平（70、80和90）下使用不同的MAR设置（无、低、中、高）进行成像。计算灵敏度、特异性和受试者操作特征曲线下面积（AUC）。
在70 kVp组中使用不同MAR设置时，准确性存在显著差异。同样，在90 kVp组中也是如此。在80 kVp时，不同MAR设置之间没有显著差异。在90 kVp时，使用低MAR/90 kVp相对于其他MAR设置具有显著更高的准确性；它在研究中还具有最高的灵敏度、特异性和AUC值。在70 kVp或90 kVp时使用中、高MAR会显著降低准确性。在本研究中，中MAR/90 kVp是最无效的设置。
在90 kVp组中使用低MAR可显著提高准确性。相比之下，在70 kVp和90 kVp时分别使用中MAR和高MAR会显著降低准确性。
