title: Effects of green tea on the shear bond strength of orthodontic brackets after in-office vital bleaching.
abstract: The application of bleaching agents before placement of resin-bonded fixed appliances significantly, but temporarily, reduces bond strength to tooth structure. Antioxidants have been studied as a means to remove residual oxygen that compromises bonding to bleached enamel. This in vitro study evaluated whether green tea (GT) could restore the shear bond strength between bonded orthodontic brackets and bleached enamel. Six experimental groups were compared: group 1, no bleaching plus bracket bonding (positive control); group 2, bleaching with 35% hydrogen peroxide (HP) plus bracket bonding (negative control); group 3, 35% HP plus 10% sodium ascorbate (SA) plus bracket bonding; group 4, 35% HP plus 10% GT plus bracket bonding; group 5, no bleaching plus 10% SA plus bracket bonding; group 6, no bleaching plus 10% GT plus bracket bonding. Results suggested that GT, like SA, may be beneficial for bracket bonding immediately after bleaching.
authors.forename: Sandrine Bittencourt
authors.initials: SB
authors.lastname: Berger
authors.forename: Ricardo Danil
authors.initials: RD
authors.lastname: Guiraldo
authors.forename: Murilo Baena
authors.initials: MB
authors.lastname: Lopes
authors.forename: Paula Vanessa
authors.initials: PV
authors.lastname: Oltramari-Navarro
authors.forename: Thais Maria
authors.initials: TM
authors.lastname: Fernandes
authors.forename: Renata de Castro Alves
authors.initials: Rde C
authors.lastname: Schwertner
authors.forename: Wagner José Silva
authors.initials: WJ
authors.lastname: Ursi
mesh_terms: D001205:Ascorbic Acid / Q000627:therapeutic use; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D016910:Orthodontic Brackets; D013662:Tea / Q000009:adverse effects*; D014073:Tooth Bleaching / Q000009:adverse effects*; D058205:Tooth Bleaching Agents / Q000009:adverse effects*
chemical_list: D013662:Tea; D058205:Tooth Bleaching Agents; D001205:Ascorbic Acid
keywords: antioxidants; bleaching; green tea; hydrogen peroxide