title: Influence of photopolymerization light source on enamel shear bond strength after bleaching.
abstract: This study evaluated the influence of 3 different photopolymerization sources on enamel shear bond strength after bleaching with 10% carbamide peroxide. Seventy-two incisive bovine teeth were randomly divided into 6 groups (n=12) according to bleaching treatment and photopolymerization source used: G1 -- Bleached / Halogen lamp; G2 -- Not bleached / Halogen lamp (control); G3 -- Bleached / Light-emitting diodes (LED); G4 -- Not bleached / Light-emitting diodes (LED) (control); G5 -- Bleached / Xenon plasma arc; G6 -- Not bleached / Xenon plasma arc (control). Experimental groups were exposed to bleaching agent for a period of 14 days, with a daily contact of 4 h and then stored in artificial saliva at 37 degrees C. Control groups were stored in artificial saliva at 37 degrees C for same period of bleaching treatment. Procedures for bonding composite resin to enamel were carried out according to manufacturer instructions. After storage in distilled water at 37 degrees C for 24 hours, all samples were submitted to shear bond strength test. G2 had the highest mean value (14.86 MPa) while G5 had the lowest (12.32 MPa). The comparison of groups by 2-way ANOVA showed that there were no significant differences for either of the factors considered in this study (bleaching and photopolymerization source), hence the interaction between these factors. It was therefore possible to conclude that neither enamel bleaching nor the photopolymerization source used had any influence on enamel shear bond strength.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry of Pernambuco, UPE, Camaragibe, PE, Brazil. sandroloretto@hotmail.com
authors.forename: Sandro Cordeiro
authors.initials: SC
authors.lastname: Loretto
authors.forename: Rodivan
authors.initials: R
authors.lastname: Braz
authors.forename: Arine Maria Víveros de Castro
authors.initials: AM
authors.lastname: Lyra
authors.forename: Luís Mário
authors.initials: LM
authors.lastname: Lopes
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000528:radiation effects*; D000077463:Carbamide Peroxide; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects*; D003748:Dental Equipment; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000528:radiation effects*; D004338:Drug Combinations; D006219:Halogens; D008027:Light; D016877:Oxidants / Q000494:pharmacology; D010545:Peroxides / Q000494:pharmacology; D044367:Phase Transition; D011897:Random Allocation; D019279:Resin Cements / Q000528:radiation effects*; D012666:Semiconductors; D033081:Shear Strength; D014073:Tooth Bleaching / Q000379:methods*; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology; D014978:Xenon
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D006219:Halogens; D016877:Oxidants; D010545:Peroxides; D019279:Resin Cements; C115612:single bond; D000077463:Carbamide Peroxide; D014978:Xenon; D017438:Bisphenol A-Glycidyl Methacrylate; D014508:Urea