Abstract
Although 3D-printing is common in dentistry, the technique does not produce the required quality for all target applications. Resin type, printing resolution, positioning, alignment, target structure, and the type and number of support structures may influence the surface roughness of printed objects, and this study investigates the effects of these variables. A stereolithographic data record was generated from a master model. Twelve printing processes were executed with a stereolithography Desktop 3D Printer, including models aligned across and parallel to the printer front as well as solid and hollow models. Three layer thicknesses were used, and in half of all processes, the models were inclined at 15°. For comparison, eight gypsum models and milled polyurethane models were manufactured. The mean roughness index of each model was determined with a perthometer. Surface roughness values were approximately 0.65 µm (master), 0.87–4.44 µm (printed), 2.32–2.57 µm (milled), 1.72–1.86 µm (cast plaster/alginate casting), and 0.98–1.03 µm (cast plaster/polyether casting). The layer height and type and number of support structures influenced the surface roughness of printed models (p ≤ 0.05), but positioning, structure, and alignment did not.
Highlights
Computer-assisted additive manufacturing has become increasingly useful in medical and dental applications [1,2,3,4,5]
This study investigates investigates the of layer layer height, height, model model positioning positioning and and alignment, alignment, type type and and number of support structures, and body type of the target structure on the surface quality of SLA-printed number of support structures, and body type of the target structure on the surface quality of SLAdental
Statistical differences were verified by means of univariate Analysis of Variance (ANOVA), post-hoc tests according to Bonferroni and Tamhane, and Student’s t-test.6 of
Summary
Computer-assisted additive manufacturing has become increasingly useful in medical and dental applications [1,2,3,4,5]. SLA printers are currently used to fabricate situational models, precision or saw-cut models, and models for implant works, as well as rails, implant drilling templates, functional trays, and even temporary dentures or complete denture prostheses [4]. Dental manufacturers promote SLA printers as a quick and easy means of fabricating many situational and saw-cut models on one build platform, thereby offering a significant reduction in the burden on dental laboratory personnel. For precision or saw-cut models, each patient’s oral cavity must be mapped with high accuracy and surface quality to produce high-precision fixed partial dentures. Fabricated precision models, transferred from polyether impressions, meet these requirements [7]. Other dental applications, such as situational models conventionally fabricated from alginate gypsum and providing surface roughnesses
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