Effects of 3% sodium ascorbyl phosphate on the hardness and bond strength of human enamel bleached with 10% carbamide peroxide.
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.
da Silva
Ana Paula Brito
AP
Department of Restorative Dentistry, Maranhao University Center, Sao Luis, Brazil.
Lima
Adriano Fonseca
AF
Cavalcanti
Andrea Nobrega
AN
Marchi
Giselle Maria
GM
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
D000975:Antioxidants; D003764:Dental Materials; D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; C011669:ascorbate-2-phosphate; D000077463:Carbamide Peroxide; D014508:Urea; D001205:Ascorbic Acid