Microtensile bond strength of a new silorane-based composite resin adhesive

Filtek LS is a new composite resin restorative system with a unique, low-shrinking, silorane-based monomer matrix. The current study was conducted to compare the durability of the bond to dentin of the new silorane-based bonding agent, Filtek Silorane System Adhesive, to the gold standard methacrylate-based bonding agent, Clearfil SE Bond. Extracted human molar teeth were sectioned to expose dentin. Either Filtek Silorane System Adhesive with Filtek LS composite or Clearfil SE Bond with Clearfil Majesty Posterior composite was applied to the dentin according to the manufacturer's instructions. The composites were placed incrementally and sectioned perpendicular to the composite-tooth interface to obtain rectangular beams. The beams were stored for 24 hours, 6 months, or 12 months in distilled water and stressed in tension in a universal testing machine. Data were analyzed with a two-way ANOVA/Tukey test. The 24-hour microtensile bond strengths were significantly greater than the 6- and 12-month bond strengths. Overall, there was no significant difference in the microtensile bond strength to dentin between the Filtek Silorane System Adhesive and the Clearfil SE Bond adhesive bonding agents. After one year of water storage, the new silorane-based composite resin bonding agent performed as well as the methacrylate-based composite resin bonding agent.