Sawicki Paweł, Regulski Piotr, Winiarski Artur, Zawadzki Paweł J
Department of Cranio-Maxillofacial Surgery, Oral Surgery and Implantology, Faculty of Dental Medicine, Medical University of Warsaw, 02-005 Warsaw, Poland.
Department of Dental and Maxillofacial Radiology, Faculty of Dental Medicine, Medical University of Warsaw, 61 Zwirki i Wigury Street, 02-091 Warsaw, Poland.
J Clin Med. 2022 Jul 2;11(13):3846. doi: 10.3390/jcm11133846.
The aim of this study was to assess the impact of dimensional distortion and its changes with modification of exposure setting parameters on the measurements of peri-implant bone margin. Ten titanium dental implants (InKone Primo, Global D, Paris, France) were placed in two prepared bovine ribs. Two bone models and an implant-with-transfer model were scanned with 3shape E4 (3shape, Copenhagen, Denmark) laboratory scanner. Cone beam computed tomography (CBCT) images of two bone models were taken with different values of voltage (60, 70, 80, 90 kV), tube current (4, 10 mA) and voxel size (200, 300 µm). All the data were superimposed using planning software, and the measurements of buccal bone thickness in two selected regions were performed both using CBCT and scan cross-sections. The mean squared error (MSE) being the squared differences between measurements was used in the accuracy assessment of the CBCT device. A one-way ANOVA revealed significant differences between voltage and MSE ( = 0.044), as well as implant position and MSE ( = 0.005). The distortions of measurements depend on bone margin thickness, and the higher the distance to measure, the higher the error. Accurate measurements of buccal bone thickness (MSE below 0.25) were achieved with voltage values of 70, 80, and 90 kV.
本研究的目的是评估尺寸失真及其随曝光设置参数修改的变化对种植体周围骨边缘测量的影响。将十颗钛牙种植体（InKone Primo，Global D，法国巴黎）植入两根制备好的牛肋骨中。使用3shape E4（3shape，丹麦哥本哈根）实验室扫描仪对两个骨模型和一个带有转移体的种植体模型进行扫描。使用不同的电压值（60、70、80、90 kV）、管电流（4、10 mA）和体素大小（200、300 µm）拍摄两个骨模型的锥形束计算机断层扫描（CBCT）图像。使用规划软件对所有数据进行叠加，并使用CBCT和扫描横截面在两个选定区域进行颊侧骨厚度测量。均方误差（MSE）作为测量值之间的平方差用于CBCT设备的准确性评估。单因素方差分析显示电压与MSE之间存在显著差异（=0.044），以及种植体位置与MSE之间存在显著差异（=0.005）。测量的失真取决于骨边缘厚度，测量距离越远，误差越高。使用70、80和90 kV的电压值可实现颊侧骨厚度的准确测量（MSE低于0.25）。
