Apostolakis Dimitrios, Michelinakis Georgios, Kourakis Georgios, Pavlakis Emmanuel
Dental Radiology in Crete, Plateia 1866 39, 73100, Chania, Crete, Greece.
Crete Implants, Heraklion, Greece.
Int J Implant Dent. 2019 May 8;5(1):20. doi: 10.1186/s40729-019-0171-9.
The aim of this study was to assess the theory that CBCT scanners can be used for a subsequent triangular mesh generation which accurately represents the actual stone model. Ten, recently acquired stone models, were used in the present study. The stone models were initially scanned with the Dental Wings 7Series dental scanner. Each stone model was then scanned using a 150-μm voxel resolution in a Planmeca Mid CBCT device with 2 sets of exposure parameters and in a Newtom VG device. The DICOM files were initially imported in Blue Sky Plan implant surgery software, segmented and then imported for computational manipulation in CloudCompare, a dedicated mesh handling software.
For all CBCTs and for all exposure parameters, the mean (SD) difference was 0.052 (0.011) mm ranging from 0.032 to 0.070 mm with a 95% CI for the population mean of 0.052 ± 0.004 mm. Specifically, the mean (SD) difference for each device/exposure parameter tested was (1) Newtom VG = 0.040 (0.006) mm, (2) Planmeca Mid 90 = 0.057 (0.0066) mm, and (3) Planmeca Mid 80 = 0.059 (0.0063) mm.
There are differences amongst the CBCT models, whilst different exposure parameters of the same model do not seem to offer a significant advantage. The interaction between the threshold value and the imaging modality as far as the errors are concerned necessitates the careful selection of the right threshold value for the triangular mesh creation.
本研究的目的是评估锥形束计算机断层扫描（CBCT）扫描仪可用于后续生成精确代表实际结石模型的三角形网格这一理论。本研究使用了10个最近获取的结石模型。结石模型最初用牙科翼7系列牙科扫描仪进行扫描。然后，每个结石模型在普兰梅卡Mid CBCT设备中使用两组曝光参数，以150μm的体素分辨率进行扫描，并在Newtom VG设备中进行扫描。DICOM文件最初导入蓝天计划种植手术软件，进行分割，然后导入专门的网格处理软件CloudCompare进行计算操作。
对于所有CBCT和所有曝光参数，平均（标准差）差异为0.052（0.011）mm，范围为0.032至0.070mm，总体均值的95%置信区间为0.052±0.004mm。具体而言，测试的每个设备/曝光参数的平均（标准差）差异为：（1）Newtom VG = 0.040（0.006）mm，（2）普兰梅卡Mid 90 = 0.057（0.0066）mm，（3）普兰梅卡Mid 80 = 0.059（0.0063）mm。
CBCT模型之间存在差异，而同一模型的不同曝光参数似乎没有显著优势。就误差而言，阈值与成像方式之间的相互作用使得在创建三角形网格时必须谨慎选择合适的阈值。
