Effects of Effervescent Vitamin C Solutions on Color Stability and Surface Roughness of Denture Base Resins.

OBJECTIVES

This study aimed to investigate the effects of two differently colored (pink, yellow) effervescent Vitamin C tablets on discoloration and surface roughness of three denture base materials.

MATERIALS AND

METHODS

Ninety disc-shaped samples (n=30) were prepared from heat-polymerized PMMA (Probase/HP), CAD/CAM-milled PMMA (M-PM Disc/CDCM), and 3D-printed resin (Dentabase/3DP). Samples were immersed in 200 mL water containing one effervescent Vitamin C tablet (Apexis Sambus Nigra or Sunlife Vitamin C) daily for 2 minutes at 24 °C for 30 days. Surface roughness (Ra) was measured using a contact profilometer, and color measurements were recorded with a spectrophotometer. Scanning Electron Microscope images were obtained at magnifications of 500×, 1000×, and 5000×. Data were analyzed using Wilcoxon Signed-Rank, Kruskal-Wallis, and Fisher-Freeman-Halton tests (p<0.05).

RESULTS

Both vitamin solutions caused a significant increase in surface roughness and discoloration in all materials (p<0.001). 3DP samples showed higher roughness values compared to other groups at baseline and after immersion (p<0.001). All materials exhibited visible color changes after the immersion period.

CONCLUSION

Effervescent Vitamin C tablets may adversely affect the surface properties of denture base resins. Patients using such supplements, especially with 3D-printed prostheses, should be informed about potential changes in color and surface quality.