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Staining resistance of denture bases produced with different techniques

Purpose: To evaluate the color stability of heat-pressed, CAD/CAM, and 3D printed complete denture resins. Materials and Methods: A total of 90 disk shape resin specimens were manufactured from conventional heat-polymerizing, CAD/CAM subtractively manufactured, and additively manufactured denture resins (n=30); were divided into three groups according to staining solution as coffee, red wine, and distilled water (as a control). Baseline color measurements were performed with a spectrophotometer. The specimens were immersed in solutions for a total of 7 days at 37 °C and second measurements were performed. Color changes were calculated with the CIEDE 2000 (ΔE00) formula. Color differences were assessed using two-way ANOVA (p = 0.05), and the paired t-test was used to compare the L, a, and b parameters in each group before and after staining. Results: Significant color differences were found among the resins and staining solutions. All of the color differences were found in the clinically acceptable range (ΔE00<1.8) except in the heat-pressed group in red wine. Red wine was found to be the most colorant agent among the solutions tested. The heat-pressed resin group demonstrated significantly higher ΔE00 in comparison to the other groups in all aging media (p <.001). Conclusion: The staining resistance of denture resins was influenced by the production technique. Subtractively manufactured, and additively manufactured denture resins were not inferior to conventional resins in terms of color stability.

Isil Karaokutan
Pamukkale University

Gulsum Sayin-Ozel
Istanbul Medipol University


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