Impact of 35% Hydrogen Peroxide on Color and Translucency Changes in Enamel and Dentin

Abstract

This study evaluated the effects of tooth bleaching with high-concentration of hydrogen peroxide on alterations of translucency parameter (TP) and color of dentin and enamel. The crown of five human molars was sectioned into four slices parallel to buccal surface. The dentin of external slices containing buccal/ lingual enamel was fully removed with diamond bur; while these slices were used to assess alterations on enamel. Alterations on dentin were assessed into the center of internal slices. The color of specimens was measured over white and black backgrounds using a spectrophotometer (CieL*a*b) at baseline, allowing to calculate the TP by difference between the color measured over each background. Specimens were submitted to three 15-min applications of 35% hydrogen peroxide followed by their storage in water for one-week. Afterwards, the color measurements were repeated at both backgrounds. Color (∆L, ∆a, ∆b and ∆E) and translucency (∆TP) changes were calculated and data individually analyzed by T-test (α = 0.05). Influence of hard tissue and assessment time on each color parameter was also analyzed by 2-way repeated measure ANOVA (α = 0.05). Tooth bleaching resulted in increased lightness for the enamel, whereas no alteration on this parameter occurred for dentin. No difference between the tooth hard tissues was observed regards the other color parameters and ∆E. A slightly reduction on TP was observed only for the enamel. In conclusion, 35% hydrogen peroxide caused similar color and translucency changes on dentin and enamel.

"Efficacy and Adverse Effects of Dental Bleaching in the Office: Literature Review"

“…Menezes et al [25] evaluated the impact of tooth whitening using 35% hydrogen peroxide in relation to the color and translucency of dentin and enamel. For the study, five healthy human molars were selected, and their crowns were sectioned into four slices parallel to the buccal surface.…”

Whitening effect of 35% hydrogen peroxide in simulation of tooth with orthodontic bracket

“…This diffusion phenomenon was first described by Haywood 6 in 1990 and consists in the ability of peroxide to diffuse through the tooth structure, 2,7-9 generate free radicals and degrade organic molecules responsible for intrinsic or extrinsic staining of dental structure. 1,2,7,[9][10][11] Color change in teeth with orthodontic bracket has been proven by some studies and this undesirable result might be caused by the permanent iatrogenic enamel effects associated with bonding, debonding, and cleaning procedures, [12][13] enamel demineralization, 14 exogenous and endogenous discoloration of the tooth and remaining adhesive material 12,15 and the color instability of the resin used to retain the bracket. 16 Among the doubts of the orthodontic patient is wondering when is the best time to perform the whitening procedure, as in addition to well-aligned teeth, they idealize white teeth and want the procedure as soon as possible.…”

Color heterogeneity and individual color changes in dentin and enamel bleached in the presence of a metallic orthodontic bracket

“…In fact, the contribution of each tissue to the overall color change caused by tooth bleaching remains controversial. [13][14][15][16] Moreover, to the best of our knowledge, no prior study has assessed the effect of a metallic bracket on the individual color changes in enamel and dentin.…”

“…It has been demonstrated that color changes in both dentin and enamel contribute to the bleaching effect, 10‐12 but information about the possible effect of brackets on the individual color changes of each tooth tissue is lacking. In fact, the contribution of each tissue to the overall color change caused by tooth bleaching remains controversial 13‐16 . Moreover, to the best of our knowledge, no prior study has assessed the effect of a metallic bracket on the individual color changes in enamel and dentin.…”