Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil.
Division of Oral Radiology, School of Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil.
Int Endod J. 2019 Jun;52(6):866-873. doi: 10.1111/iej.13065. Epub 2019 Jan 7.
To assess the influence of artefacts, the metal artefact reduction (MAR) tool and kilovoltage (kVp) on the diagnosis of simulated external root resorption (ERR) in teeth close and distant to zirconium implants in cone beam computed tomography (CBCT) images.
Cavities (0.62 mm in diameter and 0.19 mm deep) were created in the apical thirds of 12 roots on the buccal, lingual, distal or mesial surface; ten roots served as controls. The roots were randomly positioned in the first and second right and left premolar sockets of a dry human mandible, and a zirconium implant was placed in the socket of the first right molar. A ProMax 3D unit varying kVp (70, 80, or 90 kVp) and with the MAR tool activated or not was used to obtain CBCT scans. Five examiners evaluated all images to determine the area under the receiver operating characteristic (ROC) curve, sensitivity and specificity.
The ROC values and sensitivity were not affected by MAR or artefacts regardless of the distance to the implant (P > 0.05), whilst increasing kVp from 70 to 90 led to a significant increase in these values (P = 0.0202 and 0.0199, respectively). Specificity was not affected by the factors studied (P > 0.05).
Amongst the factors studied, only kVp influenced the diagnosis of simulated external root resorption in CBCT images. Increasing kVp from 70 to 90 improved the accuracy in diagnosing the simulated lesions.
评估伪影、金属伪影减少（MAR）工具和千伏（kVp）对锥形束计算机断层扫描（CBCT）图像中靠近和远离氧化锆种植体的牙齿模拟外吸收（ERR）诊断的影响。
在 12 个牙根的根尖三分之一处创建直径为 0.62mm、深度为 0.19mm 的腔；其中 10 个牙根作为对照。将牙根随机放置在干燥人下颌骨的第一和第二右侧和左侧前磨牙牙槽中，在第一右侧磨牙牙槽中放置氧化锆种植体。使用 ProMax 3D 装置，在不同的千伏（70、80 或 90 kVp）下，激活或不激活 MAR 工具，获取 CBCT 扫描。五位评估者评估所有图像以确定接收器操作特征（ROC）曲线下的面积、敏感性和特异性。
无论距离种植体的远近如何，MAR 或伪影都不会影响 ROC 值和敏感性（P>0.05），而将 kVp 从 70 增加到 90 会导致这些值显著增加（分别为 P=0.0202 和 0.0199）。研究因素对特异性没有影响（P>0.05）。
在所研究的因素中，只有 kVp 影响 CBCT 图像中模拟外吸收的诊断。将 kVp 从 70 增加到 90 可提高诊断模拟病变的准确性。
