Objectives : Proper cementation protocol is critical to the success of indirect restorations. Recommendation in materials and techniques however vary by manufacturer. The purpose of this study was to study the effects of silane on the cementation of indirect resin restorations.
Materials and methods : Tests were conducted using Paradigm MZ100 (3M ESPE) composite. The polymer matrix of bisGMA (Bisphenol A diglycidyl ether dimethacrylate) and TEGMA (tri[ethylene glycol] dimethacrylate), is reinforced with 85 wt% ultrafine zirconia-silica ceramic particles. SmartCem2 Self-adhesive cement was used to bond a button of resin cement to a substrate of Paradigm. Three groups of five resin blocks were evaluated. The specimens were mounted in cylindrical polycarbonate holders using cold cure resin. Each specimen was sanded to a flat surface using “180” grit silicon carbide sandpaper to approximate a milled surface. The control group received no surface treatment and no silane treatment prior to bonding a button of SmartCem2 (Dentsply) adhesive cement. The surface of groups two and three were prepared for bonding by air abrasion with 50 μm aluminum oxide. Group two was bonded with a button of SmartCem2 adhesive cement and Calibra silane coupling agent (Dentsply). Group three was bonded without the use of silane.