title: Effects of 3% sodium ascorbyl phosphate on the hardness and bond strength of human enamel bleached with 10% carbamide peroxide.
abstract: For this study, 120 fragments obtained from human third molars were randomly separated into 12 groups (n = 10). Four groups were used for measuring the Knoop hardness number (KHN) of enamel, while the other eight were used for testing the microtensile bond strength (muTBS) of two adhesive systems (Single Bond and Prime & Bond NT). All groups presented statistically similar KHN values. According to bond strength results, bleached enamel without antioxidant application demonstrated the lowest values of all groups. Based on these results, it could be concluded that the bleaching agents used in the present study (with or without sodium ascorbyl phosphate) did not affect human enamel hardness and that sodium ascorbyl phosphate is able to reverse the compromised bonding in bleached human enamel.
authors.affiliation: Department of Restorative Dentistry, Maranhao University Center, Sao Luis, Brazil.
authors.forename: Ana Paula Brito
authors.initials: AP
authors.lastname: da Silva
authors.forename: Adriano Fonseca
authors.initials: AF
authors.lastname: Lima
authors.forename: Andrea Nobrega
authors.initials: AN
authors.lastname: Cavalcanti
authors.forename: Giselle Maria
authors.initials: GM
authors.lastname: Marchi
mesh_terms: D000704:Analysis of Variance; D000975:Antioxidants / Q000737:chemistry*; D001205:Ascorbic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D000077463:Carbamide Peroxide; D001840:Dental Bonding; D017005:Dental Debonding; D003743:Dental Enamel / Q000187:drug effects*; D003764:Dental Materials / Q000737:chemistry*; D004338:Drug Combinations; D006244:Hardness; D006801:Humans; D016877:Oxidants / Q000009:adverse effects; D010545:Peroxides / Q000009:adverse effects; D013718:Tensile Strength; D014073:Tooth Bleaching / Q000009:adverse effects / Q000379:methods*; D014508:Urea / Q000009:adverse effects / Q000031:analogs & derivatives
chemical_list: D000975:Antioxidants; D003764:Dental Materials; D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; C011669:ascorbate-2-phosphate; D000077463:Carbamide Peroxide; D014508:Urea; D001205:Ascorbic Acid