Effect of Post Silanization Drying Methods and Duration on The Shear Bond Strength Between The Leucite-reinforced Glass Ceramic and Resin Cement

Abstract

Statement of the problem: Studies are ongoing to enhance the bonding strength between glass ceramic restorations and resin cements. The effect of va-rious drying methods on bonding strength is still controversial. Objective: The aim of this study is to determine whether different drying methods and durations affect the bonding strength between leucite re-inforced glass ceramics and resin cement. Materials and Methods: Thirty different leucite reinforced glass ceramic (G-Ceram, Atlas Enta) specimens were divided into 5 groups. All specimens were treated with 5% hydrofluoric acid (HF) (IPS Ceramic Etching Gel, for 60 seconds according to the manufacturer's instructions. After acid etching, speci-mens were rinsed with water spray for the duration of acid etching and dried with pressurized air. Following the application of primer (Monobond N, Ivoclar Vivadent), specimens were divided into 5 groups based on air-drying methods and durations: Control (C) group (dried with pressurized air for 10 seconds; air drying in ceramic furnace for 30 seconds (CF30); air drying in ceramic furnace for 60 seconds (CF60); air drying with a hair dryer for 30 seconds (HD30); air drying with a hair dryer for 60 seconds (HD60). Ceramic specimens were bon-ded with dual cure resin cement (Multilink N; Ivoclar Vivadent) using a split Teflon mold with a diameter of 2.5 mm. Force was applied to the specimens with a 1 mm/min speed using a chisel-shaped applicator tip until failure occur-red. The results were analyzed using one-way ANOVA followed by Tukey's post hoc test within the 95% confidence interval. Results: There was a significant difference among the mean bond strength values of the groups (P<0.05). Group CF60 and Group HD60 both exhi-bited significantly higher mean shear bond strength values compared with the group C (P<0.05). Group CF30 and Group HD30 showed similar bonding values with CF60, HD60 and C groups (P>0.05).Conclusions: Drying the primer with ceramic furnace or the hair dryer for 60 seconds significantly enhanced the bonding strength between the leucite-reinforced glass ceramic and resin cement.