The Effect of Universal Adhesives on Bond Strength of Two Different Resin Cement to Dentine and Enamel

INTRODUCTION: The purpose of this study was to investigate the effect of universal adhesives on the bond strength of resin cements to enamel-dentine.METHODS: In this study, facial-enamel surface of 60 freshly extracted human upper-incisors and middle-coronal dentine surface of 60 freshly extracted human lower third-molars were used.According to applied adhesive and cement, 20 groups (n=12) were randomly formed, with 2 samples each tooth.Phosphoric acid (37%) was applied to enamel surface 30 seconds, universal adhesive was applied to the dentine surface without applying acid, and resin cement samples were bonded with Tygon tubes.RelyX U200 (3M ESPE, Germany) and Variolink N (Ivoclar Vivadent, Liechtenstein) resin cement were used with Single Bond Universal (3M ESPE, Germany), All Bond Universal (Bisco, USA), Clearfil Universal (Kuraray, Japan) and Futurabond U (Voco, Germany) adhesives were used.After the samples were subjected 5000 thermal-cycles, micro-shear bond test was performed on universal testing machine.Fracture types were determined by Scanning Electron Microscopy (SEM).Obtained data were evaluated with One-Way ANOVA and Tukey-Post-Hoc tests (p<0.05).RESULTS: Universal adhesives increased bond strength of resin cement statistically significantly.In addition, bond strength enamel groups was higher than dentine groups.The lowest bond strength in enamel (13.5±2.8) and dentine (4.9±1.6) was observed group where RelyX U200 resin cement was used without applying adhesive (p<0.05). DISCUSSION AND CONCLUSION: In clinical applications, universal adhesives can be preferred before resin cementation in order to increase bond strength to enamel-dentine.