Otto Von Guericke University of Magdeburg, Magdeburg, Germany.
University Clinic of Oral and Maxillofacial Surgery, Martin-Luther University, Halle-Wittenberg, Germany.
BMC Med Imaging. 2021 Mar 10;21(1):46. doi: 10.1186/s12880-021-00567-7.
This study aimed to compare panoramic radiography (PAN) and cone beam computed tomography (CBCT) determinations of implant-to-root dimensions (IRD) in anterior and posterior maxillary regions, and to help determine in which instances increased radiation exposure from CBCT scans may be justified.
IRD measured by PAN (PAN-D) from implant-to-root sites (central incisor, lateral incisor, canine, first premolar, and second premolar) was collected from 418 implant sites in 110 adults. The CBCT technique was used as the reference method for the estimation of IRD. The PAN analysis equations were developed using stepwise multiple regression analysis and the Bland-Altman approach was applied to assess the agreement between PAN and CBCT methods.
The odds ratio that an implant at the canine-to-first premolar (9.7:1) (P = 0.000) or at the first premolar-to-second premolar region (4.5:1) (P = 0.000) belongs to the underestimation group was strong and highly significant. The root mean square error (RMSE) and pure error (PE) were highest for the canine-to-first premolar (RMSE = 0.886 mm, PE = 0.45 mm) and the first premolar-to-second premolar region (4.5:1) (RMSE = 0.944 mm, PE = 0.38 mm).
This study provides evidence of site-specific underestimations of available horizontal bone dimensions for implants when assessed by PAN. These data suggest that the canines and first and second premolars may have to be excluded when assessing root angulations via PAN.
本研究旨在比较全景放射摄影（PAN）和锥形束计算机断层扫描（CBCT）在前后上颌区域对种植体-根尺寸（IRD）的测定，并帮助确定在何种情况下 CBCT 扫描的辐射暴露增加可能是合理的。
从 110 名成年人的 418 个种植体部位收集了通过 PAN（PAN-D）测量的种植体-根部位（中切牙、侧切牙、尖牙、第一前磨牙和第二前磨牙）的 IRD。CBCT 技术被用作估计 IRD 的参考方法。使用逐步多元回归分析开发了 PAN 分析方程，并应用 Bland-Altman 方法评估 PAN 和 CBCT 方法之间的一致性。
犬牙到第一前磨牙（9.7:1）（P=0.000）或第一前磨牙到第二前磨牙（4.5:1）（P=0.000）的种植体属于低估组的优势比是强且高度显著的。犬牙到第一前磨牙（RMSE=0.886 毫米，PE=0.45 毫米）和第一前磨牙到第二前磨牙区域（4.5:1）（RMSE=0.944 毫米，PE=0.38 毫米）的根均方根误差（RMSE）和纯误差（PE）最高。
本研究提供了证据表明，当通过 PAN 评估时，可用水平骨尺寸对种植体存在特定部位的低估。这些数据表明，在通过 PAN 评估根角度时，可能需要排除犬牙和第一、第二前磨牙。
