Color change of vital teeth exposed to bleaching performed with and without supplementary light

• Published in: Journal of dentistry Vol. 37; no. 11; pp. 840 - 847
• Main Authors: Ontiveros, Joe C., Paravina, Rade D.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.11.2009; Elsevier Limited
• Subjects: Bleaching light; Color - standards; Colorimetry - methods; Dental care; Dental Enamel - drug effects; Dental shade guide; Dentin - drug effects; Dentistry; Humans; Hydrogen peroxide; Hydrogen Peroxide - pharmacology; In-office bleaching; Light; Linear Models; Methods; Oxidants - pharmacology; Power bleaching; Reproducibility of Results; Spectrophotometry; Studies; Tooth bleaching; Tooth Bleaching - methods; Tooth color; Tooth whitening; Ultraviolet radiation; Whitening lamp; Tooth bleaching; Bleaching light; Dental shade guide; Whitening lamp; Tooth color; Power bleaching; Tooth whitening; In-office bleaching
• ISSN: 0300-5712; 1879-176X; 1879-176X
• DOI: 10.1016/j.jdent.2009.06.015

The aim of this clinical study was to evaluate tooth color change after exposure to 25% hydrogen peroxide in-office tooth whitening system, with and without supplementary light exposure. Twenty subjects were treated with two separate 45-min exposures of bleach, with and without light using an opposing-arch design. Visual and instrumental color measurements were obtained from eighty teeth before bleaching and seven days after treatment using two different shade guides, Vitapan Classical (VC), Vita Bleachedguide 3D-Master (BG) and an intraoral spectrophotometer. Data were analyzed using ANOVA, paired t-test, and Wilcoxon signed rank tests at the 0.05 level of significance. Instrumental method revealed significant difference in color between treatment with light ( Δ E a b * = 6.0 ) and without light ( Δ E a b * = 4.7 ) after seven days ( p < 0.05). No differences were visually detected between treatment with light and without light using the VC ( p = 0.56). However, a significant difference was recorded using the BG ( p < 0.01). Instrumental measurements of color change were in better accordance with visual findings using the BG guide ( R 2 = 0.60) rather than the VC ( R 2 = 0.20). Within the limitations of this study, the treatment with supplementary light showed significantly greater bleaching-dependent changes in color compared to treatment without light when assessed using instrumental methods. The same was determined for the visual method with Vita Bleachedguide 3D-Master. No significant difference in color change with respect to light exposure was detected for the Vitapan Classical.