Accuracy of polymeric dental bridges manufactured by stereolythography
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 78, Issue 1
Abstract
Purpose: Purpose of this paper is to investigate the accuracy of dental bridges producedvia digital light projection stereolithography process.Design/methodology/approach: 3D printer Rapidshape D30 was used for manufacturingof two groups of samples – temporary four-part bridges and cast patterns for permanentbridges. The temporary bridges were made of NextDent C+B polymer, while the castpatterns - of NextDent Cast. The samples were manufactured with different layer’s thickness(0.035 mm and 0.050 mm). The geometrical and adjusting accuracy were investigated bymeasuring of the samples’ dimensions and silicone probe, while the surface roughness wasstudied out by profile meter and optical microscopy.Findings: It was established that the dimensions of the temporary bridges and the cast patterns,printed with layer thickness 50 μm, are larger than that of the virtual 3D model with 0.1-0.3 mm.Decreasing the layer thickness to 35 μm leads to 0.29%-1.10% smaller sizes of dental bridgesand cast patterns in comparison to that of the virtual 3D model. The average roughness deviationRa of the 3D printed temporary bridges and cast patterns is larger than that of the initial model.As the surface roughness depends on the layer’s thickness, the samples with 0.035 mm layercharacterize with lower Ra values. The silicone probe shows that the temporary bridges as wellas the cast patterns need additional adjusting in the dental office or corrections during design ofthe virtual 3D model and 3D printing process in the dental laboratory.Practical implications: The stereolithography as part of CAD/CAM manufacturingprocess characterizes with high accuracy as a whole. But present study reveals thatadditional adjusting or preliminary corrections of the design of 3D printing process areneeded for dental constructions produced by SLA.Originality/value: The geometrical and fitting accuracy as well as the surface roughnessof dental bridges, produced by stereolithography were evaluated. The data, shown in thepresent study, will help dentists and dental technicians to precise the manufacturing regimesfor production of dental constructions with high accuracy.
Authors and Affiliations
Ts. Dikova, Dzh. Dzhendov, Iv. Katreva, D. Pavlova
Keywords
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