The effect of surface treatment on shear bond strength of resin-matrix ceramics and dual-cured resin cement

Abstract

Objective:The purpose of this study was to evaluate the effect of Tetrahydrofuran (THF) on shear bond strength (SBS) between resin matrix ceramics (RMC) materials and resin cements.Methods:RMC materials(Enamic,Cerasmart,Shofu block HC) were cut into square piece of approximately 6x6x2 mm3 and randomly divided into 10 groups following the surface treatment:no treatment(C),adhesive agent(Ad),THF1min(T1),silane/adhesive(Si/Ad),THF1min/adhesive(T1/Ad),THF1min/silane/adhesive(T1/Si/Ad),THF2mins/silane/adhesive(T2/Si/Ad),THF3mins/silane/adhesive(T3/Si/Ad),THF4mins/silane/adhesive(T4/Si/Ad),THF5mins/silane/adhesive(T5/Si/Ad).Specimens were cemented to composite resin rod with resin cement and kept them in water at 37oC for 24 hours.The SBS measurements were tested with universal testing machine.Failure modes were examined by stereomicroscope.The SBS values were analyzed with two-way ANOVA and Bonferroni’s post hoc tests (α = 0.05).Results: The highest mean SBS for all RMC materials was found in group T3/Si/Ad (25.37 ± 4.73 MPa) significantly greater than almost all groups (p < 0.05), except for T4/Si/Ad and T5/Si/Ad.In addition, Enamic showed the highest SBS value (28.12 ± 5.45 MPa) followed by Cerasmart and Shofu block HC,respectively. Mixed failure was the most common found in THF with silane and adhesive agent groups.Conclusion:Tetrahydrofuran with silane and adhesive agent affected to bond strength of RMC materials and resin cements.