Effects of different intensities of the light-curing unit on the color change of bleach shade resin composites after immersion in coffee

BACKGROUND: The popularity of white teeth among patients has led to the introduction of various restorative materials with bleach shades. However, color change in these materials remains a drawback to the long-term success of such restorations. The aim of this study was to compare the effects of different light-curing intensities on the color change of three Resin-Based Composite types in two shades after immersion in coffee. METHODS: was calculated. Data were analyzed using One and Three-way ANOVA, and Post hoc Tukey HSD test in SPSS 26. P < 0.05 was considered statistically significant. RESULTS: ) significantly reduced color change in Gradia for both bleach and normal shades, as well as in Vit-l-escence for both bleach and normal shades. CONCLUSIONS: Gradia Direct and Vit-l-escence showed less significant color change at a light-curing intensity of 1400 mW/cm² compared to 1000 mW/cm²; however, Filtek Z350 did not exhibit this result. The color change of bleach shade Resin-Based Composites was also greater than that of the normal shades. Thus, light-curing intensity may influence the color stability of Resin-Based Composites, and this effect likely depends on multiple factors, such as Resin-Based Composite shade and type.