title: Repairability of aged resin composites mediated by different restorative systems.
abstract: The aim of this study was to evaluate the shear bond strength of resin composite repairs with and without aging of the surface to be repaired, using different adhesive systems and resin composites. Ninety specimens were prepared: 10 for the Control Group (GC - without repair); 40 for Group I (GI - repairs after 7 days) and 40 for Group II (GII - repairs after 180 days). Groups I and II were divided into 4 subgroups of 10 specimens each, according to the adhesive system and composite resin used: A) Adper Scotch Bond Multipurpose + Filtek Z350 XT; B) Adper Single Bond Plus + Filtek Z350 XT; C) Adper Scotch Bond Multipurpose + Esthet-X; D) Adper Single Bond Plus + Esthet-X. The specimens were tested for shear strength in a universal testing machine. The results were analyzed by two-factor one-way ANOVA and Fisher's post hoc tests (alpha=0.05). The control group had better performance than the other groups. There was no significant difference when comparing different adhesive systems and composite resins. Repairs performed at 7 days were better than those performed at 180 days. The composite repairs decreased the mechanical strength of the restoration. Aging of the resin substrate may decrease repair bond strength over time, regardless of the type of adhesive systems and resin composites used.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, 16015-050, SP, Brazil.
authors.forename: Cleidiel Aa
authors.initials: CA
authors.lastname: Lemos
authors.affiliation: Department of Restorative Dentistry, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, 16015-050, SP, Brazil.
authors.forename: Sílvio J
authors.initials: SJ
authors.lastname: Mauro
authors.affiliation: Private Practice, São Paulo, 03164-000, SP, Brazil.
authors.forename: Renata A
authors.initials: RA
authors.lastname: de Campos
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, 16015-050, SP, Brazil.
authors.forename: Paulo H
authors.initials: PH
authors.lastname: Dos Santos
authors.affiliation: Department of ConservativeDentistry, College of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, 90035-003, RS, Brazil.
authors.forename: Lucas S
authors.initials: LS
authors.lastname: Machado
authors.affiliation: Department of Restorative Dentistry, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, 16015-050, SP, Brazil. ticiane_f@hotmail.com.
authors.forename: Ticiane C
authors.initials: TC
authors.lastname: Fagundes
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D058250:Dental Restoration Repair; D003793:Dental Restoration, Permanent; D008422:Materials Testing; D013997:Time Factors
chemical_list: D003188:Composite Resins; D003738:Dental Cements
keywords: Composite resins; adhesives; aging