IADR Abstract Archives
Lithium Disilicate-Silane Pretreatment: Effect of Time on Shear Bond Strength
Objectives: Silane application is a required step prior to bonding a lithium disilicate restoration. Preparation of the intaglio surface of indirect restorations prior to patient arrival will result in reduced patient chair-time. We compared the effect on shear bond strength (SBS) of waiting four different time intervals between silane application and cementation with lithium disilicate samples.
Methods: Sixty sections of lithium disilicate (IPS e.max® CAD Ivoclar Vivadent, Amherst, NY) were crystallized according to manufacturer’s recommendations, embedded in acrylic and wet polished through 600 grit with abrasive papers. Sections were randomly assigned to 4 groups. Samples were etched with 5% Hydrofluoric acid for 20 seconds and silanated with Monobond Plus® (Ivoclar Vivadent, Amherst, NY) for 60 seconds. Samples were stored at room temperature prior to cementation. Multilink Automix® (Ivoclar Vivadent, Amherst, NY) resin cement was used with an Ultradent jig (Ultradent Products, South Jordan, UT) to fabricate two 2mm-high posts per sample for SBS testing. The time intervals between silane application and luting resin cement were: Group1- immediate; Group 2-fifteen minutes; Group 3-24 hours and Group 4-48 hours. Posts were light-polymerized for 20 seconds, and stored in water for 24 hours at 37°C. SBS was determined using an ElectroPuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min. Data were compared using ANOVA (post-hoc Tukey) with α=0.05.
Results: Waiting for fifteen minutes was statistically significantly higher compared to all other time intervals. None of the other groups were significantly different from each other.
Conclusions: For best bonding in vivo, waiting for fifteen minutes between silane application and bonding should provide optimal bond strength with lithium disilicate restorations. Pretreating intaglio surfaces up to 48 hours results in similar SBS to immediate silanation and bonding.
Methods: Sixty sections of lithium disilicate (IPS e.max® CAD Ivoclar Vivadent, Amherst, NY) were crystallized according to manufacturer’s recommendations, embedded in acrylic and wet polished through 600 grit with abrasive papers. Sections were randomly assigned to 4 groups. Samples were etched with 5% Hydrofluoric acid for 20 seconds and silanated with Monobond Plus® (Ivoclar Vivadent, Amherst, NY) for 60 seconds. Samples were stored at room temperature prior to cementation. Multilink Automix® (Ivoclar Vivadent, Amherst, NY) resin cement was used with an Ultradent jig (Ultradent Products, South Jordan, UT) to fabricate two 2mm-high posts per sample for SBS testing. The time intervals between silane application and luting resin cement were: Group1- immediate; Group 2-fifteen minutes; Group 3-24 hours and Group 4-48 hours. Posts were light-polymerized for 20 seconds, and stored in water for 24 hours at 37°C. SBS was determined using an ElectroPuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min. Data were compared using ANOVA (post-hoc Tukey) with α=0.05.
Results: Waiting for fifteen minutes was statistically significantly higher compared to all other time intervals. None of the other groups were significantly different from each other.
Conclusions: For best bonding in vivo, waiting for fifteen minutes between silane application and bonding should provide optimal bond strength with lithium disilicate restorations. Pretreating intaglio surfaces up to 48 hours results in similar SBS to immediate silanation and bonding.
2638257_File000000.jpg