Evaluation of color change using CIE LAB coordinates on tooth structure subjected to different concentrations of peroxide carbamide

Abstract

Aim:The aim of this study was to evaluate the optical behavior of tooth color using CIE L*A*B* space; the teeth were subjected to novel bleaching gels containing peroxide carbamide with potassium oxalate. Materials and Method: Three different carbamide peroxide gels were experimentally fabricated. They consisted of 10% (G10), 16% (G16) and 37% (G37) concentrations. Sixty recently extracted premolars were subjected to different bleaching protocols. Color change (ΔE) was assessed using the CIE L*a*b* system after the application of each gel. The data were analyzed using one-way ANOVA with Tukey's post hoc test (α=5%) and a t-test. Results: The G10 and G16 gels exhibited an increase in ΔE*ab parameters from T0 to T1 (T0: application day of the gels. T1: 14 th day measurement); a small decrease from T1 to T2 was also noted (T2: control measurement, 28 th day). However, no statistically significant differences were found (p=0,22 for G10 and p=0,10 for G16). The G37 gel also exhibited an increase in ΔE*ab parameters, with similar results after the first application of 45 min, the second application of 45 min, and the third application of 45 min (T1, T2 and T3, respectively. T4: control measurement, 14 th day). No statistically significant differences were observed between the three times of application (p>0,69), and an appreciable difference was noted between times T3 and T4 (p=0,000). Conclusions: The presented formulations of peroxide carbamide at 10%, 16%, and 37% are clearly effective. The G10 and G16 gels exhibited better effectiveness than the G37 gel. KEY WORDSPeroxide carbamide; Tooth bleaching.

In Vitro Color Stability of Bleached Teeth Using Peroxide-Free Bleaching Gel, Carbamide Peroxide and Hydrogen Peroxide

“…Another study has emphasized the effectiveness of carbamide peroxide in home bleaching, indicating its potential for discoloration based on a literature review [16]. Additionally, Durán et al ( 2018) have found that concentrations of 10% and 16% carbamide peroxide, when combined with potassium oxalate and uoride, were not associated with tooth sensitivity, suggesting that the 16% concentration might already be optimal without added bene ts [17].…”

Effect of 1.5% potassium oxalate on sensitivity control, color change, and quality of life after at-home tooth whitening: A randomized, placebo-controlled clinical trial

“…Variations also occurred 1 month after the end of the whitening treatment, with an increase in ΔE, indicating that the whitening process continued throughout the days following treatment. Durán et al (2018) [ 37 ] observed that this variation of ΔE tends to increase, due to the slow release of CP in the tooth and the stability of the tooth color. Tooth tissues, enamel, and dentin have distinct characteristics of opacity and translucency which are not monochromatic, but rather involve different colors in dispersion, requiring time to reach complete stability, justifying the increase in ΔE after completion of the whitening treatment in this study.…”