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 various 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 reinforced 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, specimens 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 bonded 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 occurred. 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 exhibited 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.