Evaluation of dimensional accuracy of 3D printed mandibular model using two different additive manufacturing techniques based on ultralow dose multislice computed tomography scan data: A diagnostic accuracy study

Abstract

Aim: To compare and validate the dimensional accuracy of two of the most popular 3D printing techniques: highly professional stereolithography (SLA) and low-cost fused deposition modeling (FDM), using 3D printed mandibular models based on low-dose multislice computed tomography (MSCT) scan data. Materials and Methods: In order to compare SLA and FDM, the mandibular model was scanned using an ultralow dose MSCT scanner. The scanner generated DICOM file which was converted to STL format. The digital 3D model was printed seven times with each of the printing techniques: SLA and FDM. Ten linear measurements of the printed models were compared with the reference model using a digital caliper. Differences between measurement were analyzed and compared for trueness and accuracy of both FDM and SLA printers. Results: The statistical analysis showed a statistically significant difference in the dimensional error of both techniques in comparison to the reference model, in which the mean relative difference is 0.30% and −0.97% and the mean absolute difference is 0.13 mm and −0.44 mm for SLA and FDM, respectively. Upon comparing the two utilized 3D printing techniques, the trueness of both SLA and FDM showed no statistical or clinically significant difference in the dimensional error, with the mean relative difference and the mean absolute difference of SLA being lower than those of FDM. Conclusion: These results suggest that both printers can be used safely in dental practice and that a low-cost FDM printer can provide an accuracy level comparable to the professional SLA printer.