Short- and Long-term Effects of Vegan Mouthrinses on Color Stability and Translucency of Single- and Multi-shade Resin Composites

Abstract

This study evaluated the effects of vegan mouthrinses on the color stability and translucency of single-shade and multi-shade resin composites. A total of 108 disc specimens from four resin composites (Charisma Smart, Filtek Z250, Vittra APS Unique, Zenchroma) were allocated to control, Grapefruit mouthrinse, and Chios Mastiha mouthrinse groups. Samples were immersed in 12 and 24 hours to simulate 1- and 2-year clinical use. Color (ΔE₀₀) and translucency (ΔRTP₀₀) changes were measured with a spectrophotometer. Data analysis was performed with robust ANOVA (α = 0.05). Vegan mouthrinse groups showed greater color change than the control group (p < 0.001). Vittra APS Unique showed the highest color change, exceeding clinical thresholds (> 1.8), whereas Charisma Smart was the most stable. In contrast, translucency changes were mainly material-dependent (p < 0.001) and were not influenced by solution or time. All ΔRTP₀₀ values were within clinically acceptable limits. Vegan mouthrinses had a negative effect on color stability, particularly in single-color resin composite samples; however, their effect on translucency was minimal. Multi-shade resin composites exhibited greater color stability; this indicates that vegan mouthrinses may still be clinically and visually acceptable.