Effect of coffe and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching

Abstract

There is no consensus about the waiting time necessary for the patient to start consuming beverages containing colorants again after bleaching.Objective:To evaluate the influence of beverages with coloring agents on bleached bovine incisors considering the time elapsed after bleaching.Materials and methods:Sixty bovine incisors were bleached with 35% hydrogen peroxide for in-office use (Whiteness HP Max) and divided into 10 groups. The color was evaluated with a spectrophotometer (Spectro Shade MICRO) before and after bleaching, employing the CIE-Lab system. After bleaching, the teeth were exposed for 5 min to coffee or cola-based soft drink (CBSD) at different periods after bleaching: 10 min, 1 h, 24 h, 48 h, and 72 h. Color (∆E) and lightness (∆L) variations were obtained from the CIE-Lab coordinates. Data were subjected to two-way ANOVA and Tukey HSD tests (p<0.05).Results:Significant differences were observed between groups for both the ∆L and ∆E values (p<0.001). All specimens presented a decrease in brightness (negative ∆L). The highest ∆E values were observed for teeth stained with a CBSD at 10 min and 1 h (4.12 and 4.16, respectively). Teeth pigmented with coffee presented ∆E values below 3.3 units for all evaluation times.Conclusion:The exposure to coffee after bleaching causes less color changes than the exposure to a CBSD regardless of the time after bleaching.

Influence of solutions with pigmentation potential on tooth color after bleaching using 22% carbamide peroxide

“…Similar results were not found in the literature, since the studies have limited most of these investigations to a few staining agents (BRISO et al, 2016. MATIS et al 2015SEVEN, 2014. PIROLO et al, 2014.…”

“…These changes may be partly due to the loss or denaturing of protein (ZIMMERMAN et al, 2010) and facilitate the recurrence of extrinsic staining ( JOINER, 2004. NATHOO, 1997 (KARADAS;SEVEN, 2014. PIROLO et al, 2014.…”

Staining Power of Natural and Artificial Dyes after At-home Dental Bleaching

“…20 It is known that dental staining is not only related to the pH of substances but also to different kinds of dyes present in foods, as well as exposure time. 19,[21][22][23] The food industry adds different types of natural or artificial dyes to foods to make them more attractive and to increase consumption, although they have no nutritive value. Natural plant, animal, and mineral substances have been gradually replaced by synthetic dyes because they have more powerful tinting capacity, are more uniform, and are more stable.…”

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“…As an alternative to improve the mouth appearance and reduce tooth discoloration, tooth whitening emerges arousing interest in the population as well as in the scientific community, which led to increased related scientific technique and researches 20,10,21,22 . With this in mind, when thinking about tooth whitening, it must be considered that the dental structure is permeable to bleaching agents, able to diffuse freely through the tooth promoting the desired effect 6,12 . Haywood and Heymann detailed home or supervised dental whitening technique in 1989.…”

“…Complex molecules of organic pigments, by means of an oxidation-reduction reaction are cleaved into simpler molecules and water-soluble in which easily leave the dental structure 14,27,28,29 . Home bleaching technique is preferably used on all teeth and is indicated in case teeth have become dark by the by diet or cigarette pigments, by age, trauma and fluorosis, and may also be performed before or after orthodontic braces use 6,10,21,30 .…”