J Dent Rehabil Appl Sci.  2021 Jun;37(2):73-80. 10.14368/jdras.2021.37.2.73.

Comparative evaluation of the subtractive and additive manufacturing on the color stability of fixed provisional prosthesis materials

• Lee YJ
• Oh SC

• KMID: 2525980
• DOI: http://doi.org/10.14368/jdras.2021.37.2.73

Abstract

Purpose
The purpose of this study is to compare the color stability of provisional restorative materials fabricated by subtractive and additive manufacturing.
Materials and Methods
PMMA specimens by subtractive manufacturing and conventional method and bis-acryl specimens by additive manufacturing were fabricated each 20. After immersing specimens in the coffee solution and the wine solution, the color was measured as CIE Lab with a colorimeter weekly for 4 weeks. Color change was calculated and data were analyzed with one-way ANOVA and the Tukey multiple comparisons test (α = 0.05).
Results
PMMA provisional prosthetic materials by subtractive manufacturing showed superior color stability compared to bis-acryl provisional prosthetic materials by additive manufacturing (P < 0.05), and showed similar color stability to the PMMA provisional prosthetic materials by conventional method (P > 0.05).
Conclusion
It is recommended to fabricate provisional restorations by subtractive manufacturing in areas where esthetics is important, such as anterior teeth, and consideration of the color stability will be required when making provisional prosthetic using additive manufacturing.

Keyword

color stability; computer-aided design/computer-aided manufacturing (CAD-CAM); additive manufacturing; subtractive manufacturing

Figure

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  Fig. 1 Metal mold for fabricating provisional prosthetic materials by conventional method.

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  Fig. 2 Colorimeter (ZE 2000, Nippon Denshoku, Tokyo, Japan) used in this study.

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  Fig. 3 (A), (B) and (C) are each CON group, MIL group and DLP group. Samples of the first horizontal line (a) are materials after 1 days in distilled water and samples of second (b) and third horizontal line (c) are each materials after 4 weeks in wine and coffee.

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  Fig. 4 Mean color change values (ΔE*) of materials in coffee increased as the immersion period increased (P < 0.05).

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  Fig. 5 Mean color change values (ΔE*) of materials in wine increased as the immersion period increased (P < 0.05).

Reference

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