Color stability of heat-cured polymethyl methacrylate denture base resin coated with titanium dioxide upon storage in different beverages

Abstract

Context: The purpose of this study is to evaluate the change in color of titanium dioxide (Sigma-Aldrich)-coated heat-cured polymethyl methacrylate resin samples (DPI Heat Cure) and compare it with the color change of conventionally polished samples upon storage in different beverages. Materials and Methods: Fifty disc-shaped samples were made from the DPI Heat Cure. Twenty-five samples were coated with siloxane primer (Ultradent Products) followed by titanium dioxide using an airbrush. They were then subjected to heat treatment. Remaining twenty-five samples were routinely polished. Initial color values were recorded using a spectrophotometer (Datacolor SPECTRUM 650). The samples were then immersed in artificial saliva, coffee, cola, alcohol, and turmeric solution for 10 min, followed by storage in distilled water daily for 56 days. The color change values (ΔE) were calculated using a mathematical formula. Statistical Analysis: The data were subjected to one-way analysis of variance and Tukey's honest significant difference test. Results: Uncoated samples showed higher value of color change than the coated ones in all groups. Maximum color change was seen with the turmeric solution in both groups, which was highly unacceptable clinically (ΔE≈20). Conclusion: TiO2 coating slows down the process of color change of heat-cured acrylic resin.