Kajan Zahra Dalili, Abbasi Sara, Khosravifard Negar, Sigaroudi Ali Khalighi, Motevasseli Safa
Department of Maxillofacial Radiology, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Department of Maxillofacial Radiology, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Oral Radiol. 2022 Jan;38(1):80-88. doi: 10.1007/s11282-021-00529-3. Epub 2021 Apr 24.
To compare the efficacy of digital periapical (PA) radiography with cone-beam computed tomography (CBCT) by altering the gray-scale range for the detection of bone-implant interface gaps.
Titanium implants were placed in 52 blocks of bovine rib such that 42 had no gaps and served as the control group. The implants were subsequently placed in the same blocks with 0.25 mm increase in the osteotomy size to serve as the test group. The remaining 10 blocks were used for random arrangement of the test and control blocks within a fabricated wax arch. CBCT with change in the gray-scale range and digital PA were obtained and evaluated by two observers regarding the presence/absence of gaps. The two imaging modalities were compared by the receiver operating characteristic (ROC) curve, Kappa and McNemar tests (α = 0.05).
PA and CBCT showed moderate agreement for gap detection (k = 0.60). There were no significant differences in the area under the ROC curve (AUC) between CBCT and PA (P = 0.45). The frequency of correct diagnoses on PA radiographs was significantly higher in the test group (P = 0.016), while not significant on the CBCT images (P = 0.344). PA showed higher sensitivity (100%) compared to CBCT (83.33%). However, the specificity of CBCT (92.86%) was greater than that of PA (83.33%).
Certain gray-scale ranges in CBCT enhance the assessment of bone-implant interface which brings the accuracy of CBCT closer to digital PA radiography as the modality of choice.
通过改变灰度范围，比较数字化根尖片（PA）与锥形束计算机断层扫描（CBCT）在检测骨-种植体界面间隙方面的效能。
将钛种植体植入52块牛肋骨中，其中42块无间隙，作为对照组。随后将种植体植入相同的骨块中，截骨尺寸增加0.25mm，作为试验组。其余10块用于在制作的蜡弓内随机排列试验组和对照组骨块。获取改变灰度范围的CBCT和数字化PA，并由两名观察者评估间隙的有无。通过受试者操作特征（ROC）曲线、Kappa检验和McNemar检验（α = 0.05）对两种成像方式进行比较。
PA和CBCT在间隙检测方面显示出中度一致性（k = 0.60）。CBCT和PA之间的ROC曲线下面积（AUC）无显著差异（P = 0.45）。试验组中，PA片上正确诊断的频率显著更高（P = 0.016），而在CBCT图像上则不显著（P = 0.344）。与CBCT（83.33%）相比，PA显示出更高的灵敏度（100%）。然而，CBCT的特异性（92.86%）大于PA的特异性（83.33%）。
CBCT中的特定灰度范围可增强对骨-种植体界面的评估，使CBCT作为首选成像方式时的准确性更接近数字化PA片。
