الفهرس 
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Abstract
The current study aimed to evaluate the influence of different imaging protocols (voxel sizes) of CBCT on linear measurements accuracy of different printed 3D models.
Ten intact casts with complete dentition were selected and anonymously numbered from 1-10. Casts were prepared with round bur size 2 at certain specific points to be used as fixed measurement limits. Casts were then scanned with the same CBCT machine using two voxel size protocols (0.125mm and 0.3mm). Each scan was then imported into dicom viewer software (Ondemand3d App), segmented by thresholding, and exported as STL file to be transferred to the 3D printer. Each set of reference cast and two printed copies were compared with considering cast as gold standard.
Different linear measurements throughout the three basic planes were taken using digital caliper of 0.01mm accuracy on each set by two radiologists of nine years’ experience after having set for standardization measures. Each observer had three readings to assess intra-rater variability.
Student t-test was used to compare two independent groups. Agreement between continuous variables was detected using Inter-class correlation (ICC) considering a correlation coefficient of more than 0.7 to be excellent agreement and resulted in no statistically significant difference and excellent agreement between conventional cast readings with 3D printed models 0.125 and 0.3. Although measurements taken on 3D printed models 0.125 were slightly close to the gold standard than measurements of 3D printed model 0.3.