Effect of Energy Drinks on Color Stability and Surface Roughness of Nanohybrid and Micro-Hybrid Resin Composites

Aim: This study was to evaluate the color stability and surface roughness of conventional resin composites after immersion with two different energy drinks.Materials and Methods: 66 disc specimens (6 x 2 mm) were prepared from micro-hybrid (G-ænial Posterior) and nano-hybrid (Clearfil Majesty Esthetic) resin composites. Post-polymerization was conducted by storing all specimens in distilled water at 37 °C for 24 hours. Baseline color and surface roughness (Ra) measurements were performed, after which the specimens were randomly divided into three groups (n=11/subgroup) according to the immersion solution used: Group 1 (distilled water), Group 2 (Red Bull), and Group 3 (Burn). After 7 days of immersion, final measurements were recorded. Color variations (ΔE00) were determined using a spectrophotometer and the CIEDE2000 formula before and after the immersion. Data were subjected to ANOVA analysis (α = 0.05).Results: There were no statistically significant differences in color stability between the nanohybrid and micro-hybrid resin composites (p 0.05). Both resin composites exhibited color changes exceeding the AT threshold ( 1.8) and the PT threshold ( 0.8). The highest ΔE00 values were found in the specimens exposed to Red Bull. Specimens in distilled water showed ΔE00 values below the AT threshold ( 1.8). In terms of Ra values, significant differences were noted between the materials in both the Ra0 and Ra1 measurement intervals (p 0.001 and p =0.002). The Clearfil Majesty Esthetic specimens had the highest surface roughness, with Red Bull resulting in the greatest Ra values.Conclusion: Over the 1-week immersion period, all tested solutions led to increased color changes and surface roughness in the restorative materials.