Influence of aging methods on push-out bond strength of adhesive systems to dentin cavities

1 Made available in DSpace on 2019-09-11T20:51:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2017 This study evaluated the effect of aging methods on the bond strength of etch-and-rinse adhesive systems to dentin cavities. Eighty bovine incisors were used to prepare dentin cavities, which were bonded with different adhesive systems [Adper Scotch-bond Multipurpose (SBMP), and Adper Single Bond 2 (SB)], and restored with composite resin. The specimens were stored in water for 24 h, and subjected to each aging method (n = 10): control group (not exposed to additional aging), thermal cycling (TC) (10,000 cycles; at temperatures of 5, 37, and 55 °C), mechanical loading (ML) (100,000 cycles; Hz; 60 N load), and TC + ML. The push-out bond strength test was performed using a universal testing machine. Failure modes were evaluated by scanning electron microscopy. Data were analyzed by two-way ANOVA and Tukey’s test (α = 0.05). For SBMP, only TC + ML decreased the bond strength compared to control group. For SB, all aging methods decreased similarly the bond strength compared to control group. A high number of adhesive failures were observed. Therefore, SB was sensitive to all aging methods, whilst only TC + ML was able to decrease the bond strength for SBMP. © The Author(s) 2017. Chaves, L.V.F., Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Av. Senador Salgado Filho 1787, Lagoa Nova, Natal, 59056-000, Brazil de Medeiros, T.A., Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Av. Senador Salgado Filho 1787, Lagoa Nova, Natal, 59056-000, Brazil Borges, B.C.D., Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Av. Senador Salgado Filho 1787, Lagoa Nova, Natal, 59056-000, Brazil Mainardi, M.C.A.J., Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, SP, Brazil Catelan, A., Department of Restorative Dentistry, University of Taubaté (UNITAU), Taubaté, SP, Brazil Aguiar, F.H.B., Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, SP, Brazil