Accuracy of maxillofacial prototypes fabricated by different 3-dimensional printing technologies using multi-slice and cone-beam computed tomography

Abstract

Purpose This study aimed to compare the accuracy of 3-dimensional (3D) printed models derived from multidetector computed tomography (MDCT) and cone-beam computed tomography (CBCT) systems with different fields of view (FOVs). Materials and Methods Five human dry mandibles were used to assess the accuracy of reconstructions of anatomical landmarks, bone defects, and intra-socket dimensions by 3D printers. The measurements were made on dry mandibles using a digital caliper (gold standard). The mandibles then underwent MDCT imaging. In addition, CBCT images were obtained using Cranex 3D and NewTom 3G scanners with 2 different FOVs. The images were transferred to two 3D printers, and the digital light processing (DLP) and fused deposition modeling (FDM) techniques were used to fabricate the 3D models, respectively. The same measurements were also made on the fabricated prototypes. The values measured on the 3D models were compared with the actual values, and the differences were analyzed using the paired t-test. Results The landmarks measured on prototypes fabricated using the FDM and DLP techniques based on all 4 imaging systems showed differences from the gold standard. No significant differences were noted between the FDM and DLP techniques. Conclusion The 3D printers were reliable systems for maxillofacial reconstruction. In this study, scanners with smaller voxels had the highest precision, and the DLP printer showed higher accuracy in reconstructing the maxillofacial landmarks. It seemed that 3D reconstructions of the anterior region were overestimated, while the reconstructions of intra-socket dimensions and implant holes were slightly underestimated.

Dimensional accuracy of 3D printed models using different voxel size CBCT (Comparative Experimental Study)

“…(28) A study with a special focus on the accuracy of 3D printed models derived from multidetector computed tomography (MDCT), CBCT systems with 0.2mm, 0.4mm voxel sizes, different FOV, and different 3D printer machines showed that smaller voxel size results in a higher precision of 3D reconstructions and printed models. (29) The disagreement between these studies and ours was mainly related to the usage of a larger voxel size (0.4mm) that proved to have less resolution and fewer image details.…”

Quality assurance of 3D-printed patient specific anatomical models: a systematic review

“…All combinations found in the literature are listed. Combinations no publications could be assigned to are not shown Segmentation Error Printing Error Publications basic approach imaging setup tools for linear measurements time of dissection basic approach tools for linear measurements lin nosim cal lin cal [ 121 , 134 , 144 , 152 , 158 – 160 ] cad cal dis [ 153 , 161 – 166 ] cal nodis [ 15 , 70 , 71 , 167 ] 3Dcal nodis 3Dcal [ 168 ] pat DICOM [ 80 , 81 , 137 , 141 , 169 – 178 ] pat cal [ 95 , 146 , 154 , 155 , 179 – 190 ] pat other [ 129 , 142 , 171 , 191 – 194 ] surf <...…”

Assessment of the accuracy of 3D printed teeth by various 3D printers in forensic odontology

“…In recent study conducted using 3D printed dry human mandibles, the accuracy of reconstructions of anatomical landmarks, bone defects, and intrasocket dimensions were assessed; where FDM and DLP technique showed no significant difference, however deviations were observed when compared to gold standard. 44 In another study conducted for fabrication of dental prostheses it was found DLP technique gave accurate results with less deviation. 45 The present study investigates five different 3D printers and printing materials to determine the accuracy of the printed models and to work towards validation of 3D printed teeth for use as demonstrative evidence in a courtroom.…”