title: Spectrophotometric assessment of the effects of 10% carbamide peroxide on enamel translucency.
abstract: Tooth shade results from the interaction between enamel color, enamel translucency and dentine color. A change in any of these parameters will change a tooths color. The objective of this study was to evaluate the changes occurring in enamel translucency during a tooth whitening process. Fourteen human tooth enamel fragments, with a mean thickness of 0.96 mm (+/- 0.3 mm), were subjected to a bleaching agent (10% carbamide peroxide) 8 hours per day for 28 days. The enamel fragment translucency was measured by a computer controlled spectrophotometer before and after the bleaching agent applications in accordance with ANSI Z80.3-1986--American National Standard for Ophthalmics--nonprescription sunglasses and fashion eyewear-requirements. The measurements were statistically compared by the Mann-Whitney non-parametric test. A decrease was observed in the translucency of all specimens and, consequently, there was a decrease in transmittance values for all samples. It was observed that the bleaching procedure significantly changes the enamel translucency, making it more opaque.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Glauco Fioranelli
authors.initials: GF
authors.lastname: Vieira
authors.forename: Yuri
authors.initials: Y
authors.lastname: Arakaki
authors.forename: Taciana Marco Ferraz
authors.initials: TM
authors.lastname: Caneppele
mesh_terms: D000077463:Carbamide Peroxide; D003116:Color; D003124:Colorimetry; D003743:Dental Enamel / Q000187:drug effects*; D003804:Dentin / Q000737:chemistry / Q000187:drug effects; D004338:Drug Combinations; D006801:Humans; D066298:In Vitro Techniques; D008027:Light; D016877:Oxidants / Q000494:pharmacology*; D010545:Peroxides / Q000494:pharmacology* / Q000627:therapeutic use; D013053:Spectrophotometry; D014073:Tooth Bleaching / Q000379:methods*; D014075:Tooth Discoloration / Q000628:therapy; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea