Dimensional Analysis Of 3D-printed Dental Arches: Comparing Vat Photopolymerization Workflows
Abstract
Objectives: This study aimed to propose a novel approach to analyze 3D-printed dental arch modelsdimensions and compare the deviations resulting from various vat photopolymerization workflows (VPPW),each defined by a specific combination of printer, resin type and layers thicknesses. Methods: A reference model (RM) of a digital dental arch with a custom support base was printed withdifferent layer thicknesses and resins specific to one of the four 3D printers, one SLA printer (Form 3B+), oneDLP printer (Pro95 S), and two LCD printers (Sonic Mini 8K; Form 4B) (Table 1). The RM and 110 scans of theprinted models underwent the same mesh processing before dimensional analysis using a best-fit algorithm.The normalized deviation (ND) between the printed models and RM was calculated as the ratio of theintegrated absolute distance (I ID I) to the area of valid distance (AVD). ND values were then weighted (wND) bythe ratio of AVD to the surface area of the mesh-processed RM (ARMmesh) (Image 1). Results: Weighting the values of ND was relevant into showing the discrepancy between models with eitherhigher or lower AVD, however wND values could be more finely adjusted. Reducing the layer thickness (i.e.50μm) was not consistently correlated with a decrease in wND for every VPPW (Image 2). Form 4B workflowsprovided overall lower wND than the other workflows. Conclusions: A specific VPPW alone is not sufficient to ensure limited deviations. Instead, it is a combinationof software and hardware parameters throughout the printing workflow which needs to be tuned to thecharacteristic of a specific resin.
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