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http://dx.doi.org/10.14347/jtd.2021.43.3.77

Color evaluation by thickness of interim restorative resin produced by digital light processing 3D printer  

Kang, Wol (Department of Dental Technology, Daegu Health College)
Kim, Won-Gi (Department of Dental Technology, Daegu Health College)
Publication Information
Journal of Technologic Dentistry / v.43, no.3, 2021 , pp. 77-83 More about this Journal
Abstract
Purpose: The purpose of this in vitro study was to measure and compare the thickness-dependent color dimensions of digital light processing (DLP) three-dimensional (3D) printer and conventional interim restorative resin. Methods: Specimens (N=60) were fabricated using either subtractive manufacturing (S group) or DLP 3D printing (D group) material. All milled and 3D-printed specimens were allocated into three different groups (n=10) according to different thicknesses as follows: 1.0, 1.5, and 2.0 mm. Color measurements in the CIELab coordinates were made using a spectrophotometer under room light conditions (1,003 lux). The color differences (𝚫E*) between the specimen and control target data were calculated. Data were analyzed using the oneway analysis of variance (ANOVA). Post hoc comparisons were conducted using Tukey's honestly significant difference method (α=0.05 for all tests). Results: The 𝚫L*, 𝚫a*, 𝚫b*, and 𝚫E* values of interim restorative resin produced by DLP 3D printing were obtained in terms of the specimen's thickness increased compared with the increases by subtractive manufacturing. When the thickness was similar, the color difference between subtractive manufacturing and DLP 3D printing was ≥5.5, which is a value required by the dentist for remanufacturing. Conclusion: Color was influenced by the thickness of the interim restorative resin produced by DLP 3D printing.
Keywords
Color; Temporary dental restoration; Three-dimensional printing;
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