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Online ISSN 1827-174X
Moura S. 1, Chimentão L. 1, Kléin-Júnior C. 2, Mattos A. 3, Carvalho R. 1, Guiraldo R. 1, Poli-Frederico R. 1, Miranda-Júnior W. 4
1 Dentistry, Restorative Dentistry, University North of Parana, Londrina, Brazil;
2 Dentistry, Restorative Dentistry, University Luterana do Brasil, Cachoeira do Sul, Brazil;
3 Dentistry, Restorative Dentistry, University of São Paulo, São Paulo, Brazil;
4 Dental Materials, Biomaterials and Oral Biology, University of São Paulo, São Paulo, Brazil
AIM: Few studies compared the silorane and mechacrylate based resins bonded to enamel. The aim of this study was to evaluate the bonding durability of silorane and methacrylate-based resins to enamel.
METHODS: Twenty seven molars were divided into G1 Clearfil SE Bond/Filtek Z350; G2 Adper Easy One/Filtek Z350; and G3 P90 Adhesive System/Filtek P90 groups. Following application of adhesive systems, blocks of composites were built, samples were stored in water (24 hours/37 ºC), sectioned (0.8 mm²) and tested in tensile (24 hours and 6 months). Fractures were observed (40×). Bond strength (in MPa) was analysed by MANOVA General Linear Model and Tukey’s post-hoc test at 5%. The power test was calculated. The etching pattern was observed.
RESULTS: There were differences for material (P=0.029), storage time (P=0.012) and their interaction (P=0.000). Similar bond strengths were found at 24 h for all. The bond strength of G1 decreased after 6 months. At 6 months, G2 showed higher bond strength than G1 and G3, that were similar. The power-test value was 0.87. Mixed fractures and enamel rods were observed.
CONCLUSION: Bond strength varied over time depending on the restorative system.