To study the effect of three energy drinks on the color stability of
nanofilled composite resins after different periods of aging time.
Materials and methods: Composite resin disks, 6 mm diameter, 3 mm
thickness were prepared from Filtec Z350 XT, Tetric EvoCeram, and Filtec
Z250 XT. Specimens from each material were tested after aging with Red
Bull, Bison and Power Horse energy drinks and distilled water as a
control. Specimens were stored at 37°C in dark containers for 1, 7, 30
and 60 days. Color was assessed in the CIELAB using a colorimeter before
and after each storage period. Color differences ΔE*ab and Δb* among
specimens were measured. Mean values were statistically analyzed using
one-way analysis of variance (ANOVA), with p < 0.05 as significance
level. Results: The color change ΔE*ab and Δb* occurred by Red Bull,
Bison and Power Horse energy drinks was significantly different for all
tested materials at all four times p < 0.05 except in the Red Bull
group. All specimens showed increase in color changes toward yellowness
Δb* after a period of 1, 7, 30 and 60 days. The highest total color
difference ΔE*ab was found in the Red Bull group after 60 days.
Conclusion: Energy drinks used in this study had staining effect on the
tested composite resin materials. The discoloration increased with aging
time toward yellowness; however, it was not perceptible in all test
groups after 60 days.