title: Effect of tooth bleaching on bond strength of enamel-dentin cavities restored with silorane- and dimethacrylate-based materials.
abstract: The aim of this study was to evaluate the influence of tooth bleaching on the push-out bond strength of a composite resin based on dimethacrylates and silorane to cavities that involve both enamel and dentin. A total of 80 bovine incisors were sectioned on the buccal surface to obtain specimens (10 × 10 mm) presenting enamel and dentin (1-mm thick each substrate). The specimens were randomly distributed into eight groups (n=10), according to the bleaching protocol (1--none; 2--10% carbamide peroxide [CP] for 21 days, six hours each day; 3--three applications of 35% hydrogen peroxide [HP] in 15-minute sessions, one session every seven days for three weeks; 4--10% CP for 18 days, six hours each day + three applications of 35% HP in 15-minute sessions, one session every seven days for three weeks) and the restorative system applied (Adper Single Bond 2 + Filtek Supreme; Filtek Silorane adhesive and composite resin). After treatment, cavities were made (1.2-mm diameter on dentin; 1.5-mm diameter on enamel) with a diamond bur. At 24 hours after restoration, a push-out bond strength test was performed at a crosshead speed of 0.5 mm/min. The bleaching treatments did not significantly affect the bond strengths of either restorative system to enamel-dentin. Regardless of the bleaching treatment, the dimethacrylate-based resin system exhibited significantly higher bond strengths to enamel-dentin than did the silorane-based system.
authors.affiliation: Piracicaba Dental School – State University of Campinas, Restorative Dentistry, Piracicaba, Sao Paulo, Brazil. lima.adf@gmail.com
authors.forename: A F
authors.initials: AF
authors.lastname: Lima
authors.forename: R T
authors.initials: RT
authors.lastname: Sasaki
authors.forename: L S
authors.initials: LS
authors.lastname: Araújo
authors.forename: L A
authors.initials: LA
authors.lastname: Gaglianone
authors.forename: M S
authors.initials: MS
authors.lastname: Freitas
authors.forename: F H B
authors.initials: FH
authors.lastname: Aguiar
authors.forename: G M
authors.initials: GM
authors.lastname: Marchi
mesh_terms: D000818:Animals; D000077463:Carbamide Peroxide; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003743:Dental Enamel / Q000473:pathology; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000473:pathology; D006861:Hydrogen Peroxide; D008422:Materials Testing; D008689:Methacrylates; D010545:Peroxides; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D062047:Silorane Resins; D012833:Siloxanes; D014073:Tooth Bleaching / Q000379:methods; D014508:Urea / Q000031:analogs & derivatives
chemical_list: C554641:Adper single bond 2; D003188:Composite Resins; D003738:Dental Cements; D008689:Methacrylates; D010545:Peroxides; D019279:Resin Cements; D062047:Silorane Resins; D012833:Siloxanes; C555513:silorane composite resin; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide