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Color stability of visible light-cured, hard direct denture reliners: an in vitro investigation
G L Polyzois1, S A Yannikakis, A J Zissis
1Department of Prosthodontics, School of Dentistry, University of Athens, Greece. remprath@internet.gr
Purpose:
Previous studies have disclosed the unsatisfactory color stability of autopolymerizing, hard direct denture reliners (HDDR). The present study investigated the color stability of the newly introduced visible light-cured and dual-cured HDDRs.
Materials And Methods:
Five HDDRs were evaluated after 1 hour, 1 day, 7 days, and 30 days of immersion in coffee, tea, and water. Color measurements were obtained with a tristimulus colorimeter, and color differences (delta E*) were calculated.
Results:
After 30 days of immersion one visible light-cured material exhibited the highest delta E* value (17.8). The other materials showed acceptable color stability in water and coffee. However, tea strongly affected their color.
Conclusion:
Reliners, staining solutions, and immersion time are significant factors that affect color stability. After 7 days of immersion, all of the materials showed perceptible color differences. Tea exhibited higher staining capacity than coffee.