Abstract
With the advent of 3D printing technologies in dentistry, the optimization of printing conditions has been of great interest, so this study analyzed the accuracy of 3D-printed temporary restorations of different sizes produced by digital light processing (DLP) and liquid crystal display (LCD) printers. Temporary restorations of 2-unit, 3-unit, 5-unit, 6-unit, and full-arch cases were designed and printed from a DLP printer using NextDent C&B or an LCD printer using Mazic D Temp (n = 10 each). The restorations were scanned, and each restoration standard tessellation language (STL) file was superimposed on the reference STL file, by the alignment functions, to evaluate the trueness through whole/point deviation. In the whole-deviation analysis, the root-mean-square (RMS) values were significantly higher in the 6-unit and full-arch cases for the DLP printer and in the 5-unit, 6-unit, and full-arch cases for the LCD printer. The significant difference between DLP and LCD printers was found in the 5-unit and full-arch cases, where the DLP printer exhibited lower RMS values. Color mapping demonstrated less shrinkage in the DLP printer. In the point deviation analysis, a significant difference in direction was exhibited in all the restorations from the DLP printer but only in some cases from the LCD printer. Within the limitations of this study, 3D printing was most accurate with less deviation and shrinkage when a DLP printer was used for short-unit restorations.
Highlights
Temporary restorations are temporary prostheses used to protect teeth under dental treatment or to replace lost teeth to stabilize the surrounding tissue and maintain esthetics
digital light processing (DLP) restorations tended to exhibit less shrinkage than liquid crystal display (LCD) restorations, with the shrinkage being most remarkable on the occlusal surfaces
The 3D printing of temporary restorations was more inaccurate for larger restorations in both DLP and LCD printers
Summary
Temporary restorations are temporary prostheses used to protect teeth under dental treatment or to replace lost teeth to stabilize the surrounding tissue and maintain esthetics. They protect the teeth from deformation, leakage, chemical irritation, and plaque accumulation before the final prosthesis is prepared [1]. With the rapid introduction of digital dentistry, 3D printing has been newly applied for the fabrication of dental prostheses [3]. Compared to the process of manufacturing temporary restorations through conventional means, 3D printing is considered more comfortable for patients and replaces much of the laboratory work [3]. As the demand of 3D printing increases, various types of 3D printing techniques are being continuously developed, including digital light processing (DLP) and liquid crystal display (LCD)
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