Kim Jun Ho, Abdala-Júnior Reinaldo, Munhoz Luciana, Cortes Arthur Rodriguez Gonzalez, Watanabe Plauto Christopher Aranha, Costa Claudio, Arita Emiko Saito
Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Department of Dental Surgery, Faculty of Dental Surgery, University of Malta, Mater Dei Hospital, Msida, Malta.
Imaging Sci Dent. 2020 Jun;50(2):133-139. doi: 10.5624/isd.2020.50.2.133. Epub 2020 Jun 18.
This study compared 2 cone-beam computed tomography (CBCT) systems in the detection of mechanically simulated peri-implant buccal bone defects in dry human mandibles.
Twenty-four implants were placed in 7 dry human mandibles. Peri-implant bone defects were created in the buccal plates of 16 implants using spherical burs. All mandibles were scanned using 2 CBCT systems with their commonly used acquisition protocols: i-CAT Gendex CB-500 (Imaging Sciences, Hatfield, PA, USA; field of view [FOV], 8 cm×8 cm; voxel size, 0.125 mm; 120 kVp; 5 mA; 23 s) and Orthopantomograph OP300 (Intrumentarium, Tuusula, Finland; FOV, 6 cm×8 cm; voxel size, 0.085 mm; 90 kVp; 6.3 mA; 13 s). Two oral and maxillofacial radiologists assessed the CBCT images for the presence of a defect and measured the depth of the bone defects. Diagnostic performance was compared in terms of the area under the curve (AUC), accuracy, sensitivity, specificity, and intraclass correlation coefficient.
High intraobserver and interobserver agreement was found (<0.05). The OP300 showed slightly better diagnostic performance and higher detection rates than the CB-500 (AUC, 0.56±0.03), with a mean accuracy of 75.0%, sensitivity of 81.2%, and specificity of 62.5%. Higher contrast was observed with the CB-500, whereas the OP300 formed more artifacts.
Within the limitations of this study, the present results suggest that the choice of CBCT systems with their respective commonly used acquisition protocols does not significantly affect diagnostic performance in detecting and measuring buccal peri-implant bone loss.
本研究比较了两种锥形束计算机断层扫描（CBCT）系统在检测干燥人下颌骨中机械模拟的种植体周围颊侧骨缺损方面的效果。
在7具干燥人下颌骨中植入24颗种植体。使用球形车针在16颗种植体的颊侧骨板上制造种植体周围骨缺损。使用两种CBCT系统及其常用采集协议对所有下颌骨进行扫描：i-CAT Gendex CB-500（美国宾夕法尼亚州哈特菲尔德市影像科学公司；视野[FOV]，8 cm×8 cm；体素大小，0.125 mm；120 kVp；5 mA；23秒）和全景X射线机OP300（芬兰图苏拉市Instrumentarium公司；FOV，6 cm×8 cm；体素大小，0.085 mm；90 kVp；6.3 mA；13秒）。两名口腔颌面放射科医生评估CBCT图像中是否存在缺损，并测量骨缺损的深度。根据曲线下面积（AUC）、准确性、敏感性、特异性和组内相关系数比较诊断性能。
观察者内和观察者间一致性较高（<0.05）。OP300的诊断性能略优于CB-500，检测率更高（AUC，0.56±0.03），平均准确率为75.0%，敏感性为81.2%，特异性为62.5%。CB-500的对比度更高，而OP300产生的伪影更多。
在本研究的局限性内，目前的结果表明，选择具有各自常用采集协议的CBCT系统在检测和测量种植体周围颊侧骨丢失方面对诊断性能没有显著影响。
