High-concentrated carbamide peroxide bleaching agents effects on enamel surface.
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.
Department of Restorative Dentistry, University of Campinas, Piracicaba School of Dentistry, Piracicaba, Brazil.
V
V
Cavalli
C A G
CA
Arrais
M
M
Giannini
G M B
GM
Ambrosano
D000077463:Carbamide Peroxide; D003743:Dental Enamel / Q000187:drug effects*; D004338:Drug Combinations; D005782:Gels; D006801:Humans; D008751:Methylene Blue; D008963:Molar; D010545:Peroxides / Q000009:adverse effects*; D013499:Surface Properties; D014073:Tooth Bleaching / Q000379:methods*; D014508:Urea / Q000009:adverse effects* / Q000031:analogs & derivatives*
D004338:Drug Combinations; D005782:Gels; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea; D008751:Methylene Blue