title: In vitro action of various bleaching agents on the microhardness of human dentin.
abstract: The authors verified a decrease in human dentin microhardness after application of the following bleaching agents for 72 hours: sodium perborate+water, sodium perborate + 3% hydrogen peroxide, sodium perborate + 30% hydrogen peroxide, Endoperox (crystallized hydrogen peroxide), Proxigel (carbimide peroxide), and 30% hydrogen peroxide. Sodium perborate+water and sodium perborate + 3% hydrogen peroxide caused less of a decrease in dentin microhardness than Endoperox, Proxigel and 30% hydrogen peroxide which caused the greatest decreases in dentin microhardness. Sodium perborate + 30% hydrogen peroxide fell into a statistically intermediate position.
authors.affiliation: Faculdade de Odontologia, Ribeirão Preto University of São Paulo, Brasil.
authors.forename: J D
authors.initials: JD
authors.lastname: Pécora
authors.forename: A M
authors.initials: AM
authors.lastname: Cruzfilho
authors.forename: M D
authors.initials: MD
authors.lastname: Sousaneto
authors.forename: R G
authors.initials: RG
authors.lastname: Silva
mesh_terms: D000704:Analysis of Variance; D001881:Borates / Q000633:toxicity*; D000077463:Carbamide Peroxide; D003804:Dentin / Q000187:drug effects*; D003806:Dentin Permeability / Q000187:drug effects; D004338:Drug Combinations; D006244:Hardness / Q000187:drug effects; D006245:Hardness Tests; D006801:Humans; D006861:Hydrogen Peroxide / Q000633:toxicity*; D007180:Incisor; D008437:Maxilla; D010545:Peroxides / Q000633:toxicity*; D014073:Tooth Bleaching / Q000009:adverse effects*; D014508:Urea / Q000031:analogs & derivatives* / Q000633:toxicity
chemical_list: D001881:Borates; D004338:Drug Combinations; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide; C027707:sodium perborate