الفهرس 
Evaluation of dimensional accuracy of 3D printed mandibular model using two different additive manufacturing techniques based on ultra-low dose multislice computed tomography scan data
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Abstract
Aim: The aim of the current study is to compare and validate the dimensional accuracy of two of the most popular 3D printing techniques; highly professional stereolithography (SLA) and lowcost fused deposition modeling (FDM), using 3D printed mandibular models based on ultra-low dose MSCT scan data. Methodology: Ten linear measurements were measured directly on mandibular model between anatomical landmarks using digital caliper. Radio-opaque markers were fixed on these anatomical landmarks to serve as the reference standard for all measurements. The mandibular model was scanned using ultra-low dose MSCT machine at 80 kVp,10 mA. MSCT scans were exported and transferred in DICOM format. Accordingly, the STL file was generated by 2InVesalius 33 software, in addition to2Meshmixer 3.53 software for optimizing and finishing of the STL file. The scanned model was saved as STL file format. 3D printing was done using two different additive manufacturing techniques; SLA using 2Form 2 printer3 and FDM using 2Zortax M300 printer3.The scanned model was printed 7 times per each printer. Same ten linear measurements were recorded for all the printed models. Results: The statistical analysis of the collected data showed promising results.The precision of both SLA and FDM showed no statistically significant difference reflecting their high ability of repeatability. Regarding the trueness, there is a statistically significant difference in the dimensional error of both techniques in comparison to the reference model, where 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 that of FDM. Also, high level of agreement was demonstrated in the repeatability of the measurements in the current study with strong intra and interobserver reliability