DOI: 10.3290/j.jad.a28733, PubMed ID (PMID): 23534019Pages 145-150, Language: Englishde Sá Barbosa, Wladimir Franco / Aguiar, Thaiane Rodrigues / Francescantonio, Marina Di / Cavalcanti, Andrea Nóbrega / de Oliveira, Marcelo Tavares / Giannini, MarceloPurpose: To evaluate the microshear bond strength of resin cements to yttrium-stabilized tetragonal zirconium oxide surfaces after water storage for 24 h or 1 year.
Materials and Methods: Four self-adhesive (BisCem, G-Cem, RelyX Unicem, SeT) and one conventional resin cement (RelyX ARC) were tested. The materials were mixed and inserted in tubes (0.75 mm diameter × 1 mm height) that were placed over the zirconium oxide surface. Specimens were tested after 24-h or 1-year water storage. Microshear testing was performed using a universal testing machine. Shear bond strength results were analyzed using two-way ANOVA and Tukey's test (5%).
Results: After 24-h water storage, no difference was found between G-Cem and RelyX Unicem resin cements; however, their bond strength means to zirconium oxide were statistically higher than RelyX ARC. The bond strength values of all resin cements dropped significantly after 1 year of water storage. G-Cem presented the highest values among cements after long-term water exposure.
Conclusions: One-year water storage decreased the microshear bond strengths to zirconium oxide for all resin cements tested.
Keywords: resin cement, zirconium oxide, bond strength
