Restorative Dentistry & Endodontics

Research Article

Effect of sugar and sweetener on the bleachability of coffee and tea-induced stains on composites: an in vitro experimental study: Nilay Bayraktar, Osman Kerim Arda Karaca, Yunus Ekşılı, Mustafa Furkan Yıldırım, Osman Tolga Harorli; Restor Dent Endod 2026;51(2):e16. Published online April 1, 2026; DOI: https://doi.org/10.5395/rde.2026.51.e16

Objectives
This in vitro study evaluated the effects of various sugary and non-sugary beverages on the color change of a dental composite and the subsequent bleaching efficacy.
Methods
Forty-nine disc-shaped composite samples (Neo Spectra ST, Dentsply Sirona) were split into seven groups at random (n = 7). Distilled water was used to hydrate each sample for 24 hours at 37°C. After 24 hours, the first color measurements (T0) were made by using a clinical spectrophotometer (VITA Easyshade Compact; VITA Zahnfabrik). Color measurements were repeated after 7 days (T1) and 14 days (T2) of immersion in distilled water (control), tea, coffee, sugary tea, sugary coffee, tea with sweetener added, and coffee with sweetener added. After staining for 2 weeks, the specimens were bleached for 6 hours a day for a week using 16% carbamide peroxide (Opalescence Ultradent Products). Color measurements were taken again after bleaching (T3). Using CIEDE2000, color differences (ΔE) were computed. Analysis of variance (ANOVA) and repeated measures ANOVA with a Tukey post hoc test were used to evaluate the data.
Results
After 1 week, coffee-containing solutions produced significantly greater discoloration than the control (p < 0.001). By 2 weeks, tea groups exhibited similar discoloration to coffee groups (p < 0.001). The addition of sugar or sweetener had no significant effect (p > 0.05). Post-bleaching, coffee groups showed lower Whiteness Index values than the control, without statistical significance (p > 0.05).
Conclusions
Coffee and tea markedly stain resin composites, with discoloration persisting post-bleaching, while sugar or sweetener additions exert no significant effect.

Citations

Citations to this article as recorded by

Effects of surface treatment methods on the color stability, whiteness, and surface roughness of bleach-shade composite resins
İlayda Kutlu, Muhammet Fi̇dan
BMC Oral Health.2026;[Epub] CrossRef

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