High-concentrated carbamide peroxide bleaching agents effects on enamel surface

J Oral Rehabil. 2004 Feb;31(2):155-9. doi: 10.1111/j.1365-2842.2004.01138.x.

Abstract

Concern has been expressed regarding the adverse effects of peroxide-containing tooth bleaching agents on enamel surface. This study examined enamel average surface roughness before (baseline) and after an in-office bleaching protocol and investigated the influence of high concentrations of carbamide peroxide gels on its surface staining and morphology. Flat enamel surfaces were submitted to 35 and 37% carbamide peroxide or to no bleaching treatment (n = 10) and evaluated with a profilometer. Eight specimens from each group were randomly selected and immersed in a 2% methylene blue solution. Afterwards, specimens were ground into powder and prepared for the spectrophotometric analysis. Two remained specimens of each group were examined using a scanning electron microscope. Data were subjected to analysis of variance and Tukey test (P > 0.05). Baseline roughness average was statistically similar for all groups, however, 35% carbamide peroxide produced the roughest enamel surfaces. Different concentrations of carbamide peroxide produced similar staining means and enamel surface morphological alterations.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbamide Peroxide
  • Dental Enamel / drug effects*
  • Drug Combinations
  • Gels
  • Humans
  • Methylene Blue
  • Molar
  • Peroxides / adverse effects*
  • Surface Properties
  • Tooth Bleaching / methods*
  • Urea / adverse effects*
  • Urea / analogs & derivatives*

Substances

  • Drug Combinations
  • Gels
  • Peroxides
  • Carbamide Peroxide
  • Urea
  • Methylene Blue