Color stability of conventional pmma, modified mma and polyamide denture base materials in different beverages

Abstract

Objective: This study aimed to determine how commonly consumed beverages affected the color stability of denture base materials over time.Materials and Methods: Twenty disks (10.0-mm diameter, 2.0-mm thick) of conventional polymethylmethacrylate (PMMA) (Meliodent), modified methyl methacrylate monomer (MMA) (Bre-Crystal and Acryfee), and polyamide (Bre-Flex, Flexinylon, and T Crystal) acrylic resins with smooth and rough surfaces were prepared. The color of the specimens was measured using a colorimeter at that time (T0). Each specimen was immersed in coffee, coke, tea, and distilled water. The color of the specimens was measured again after 1-day (T1), 12-day (T2), and 36-day (T3) immersion periods. The CIE L*a*b* system was used to calculate the mean color changes for each material, which were then statistically compared using repeated measures ANOVA and Bonferroni intervals at 0.95.Results: Regardless of time or beverage, there was no significant difference between smooth and rough surfaces (p>0.05). Across all time intervals, the modified MMA (Bre-cystal) demonstrated a statistically significantly lower color difference (p<0.05). Regardless of time, modified MMA (Acryfree) and conventional PMMA (Meliodent) specimens exposed to coke demonstrated significantly lower color stability than all others (p<0.05).Conclusion: Beverages did not cause a statistically significant color change compared with distilled water after T1 and T3 periods. According to the NBS system, the color changes after the T3 period were between "slight" and "much". Modified MMA resin (Bre-Crystal) can be used as a denture base material in patients with PMMA allergy because of its high color stability in long-term use.