title: Microtensile bond strength of methacrylate and silorane resins to enamel and dentin.
abstract: The aim of this study was to evaluate the microtensile bond strength (µTBS) of two substrates (enamel and dentin) considering two study factors: type of composite resin [methacrylate-based (Filtek Supreme) or silorane-based (Filtek LS)] and aging time (24 h or 3 months). Twenty human molars were selected and divided into 2 groups (n=10) considering two dental substrates, enamel or dentin. The enamel and dentin of each tooth was divided into two halves separated by a glass plate. Each tooth was restored using both tested composite resins following the manufacturer's instructions. The samples were sectioned, producing 4 sticks for each composite resin. Half of them were tested after 24 h and half after 3 months. µTBS testing was carried out at 0.05 mm/s. Data were analyzed by three-way ANOVA and Tukey's HSD tests at α=0.05. Significant differences between composite resins and substrates were found (p<0.05), but no statistically significant difference was found for aging time and interactions among study factors. The methacrylate-based resin showed higher µTBS than the silorane-based resin. The µTBS for enamel was significantly higher than for dentin, irrespective of the composite resin and storage time. Three months of storage was not sufficient time to cause degradation of the bonding interaction of either of the composite resins to enamel and dentin.
authors.affiliation: Department of Operative Dentistry and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Gisele Rodrigues
authors.initials: GR
authors.lastname: da Silva
authors.affiliation: Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Isabela Sousa
authors.initials: IS
authors.lastname: Araújo
authors.affiliation: Department of Operative Dentistry and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Rodrigo Dantas
authors.initials: RD
authors.lastname: Pereira
authors.affiliation: Department of Operative Dentistry and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Bruno de Castro Ferreira
authors.initials: Bde C
authors.lastname: Barreto
authors.affiliation: Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Célio Jesus
authors.initials: CJ
authors.lastname: do Prado
authors.affiliation: Department of Operative Dentistry and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
authors.affiliation: Department of Operative Dentistry, Piracicaba School of Dentistry, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Luís Roberto Marcondes
authors.initials: LR
authors.lastname: Martins
mesh_terms: D003743:Dental Enamel; D003804:Dentin; D006801:Humans; D066298:In Vitro Techniques; D008689:Methacrylates; D062047:Silorane Resins; D013718:Tensile Strength
chemical_list: D008689:Methacrylates; D062047:Silorane Resins