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BIS-SILANE is a two-part silane coupling agent that is used to enhance adhesion between porcelain and composite resins. Based on clinical experience, it has been noted that the silane, as packaged in the one-bottle systems, tends to polymerize as it approaches the end of its shelf life. The two-bottle silane system offers a more stable system to ensure effective bonding to porcelain. BIS-SILANE is an ethanol-based product and therefore is less volatile than other acetone-based silane products, also helping to ensure its effectiveness. Silane is a dual function monomer consisting of a silanol group that reacts with the porcelain surface, and a methacrylate group that co-polymerizes with the resin matrix of the composite. Silane coupling agents are known to enhance the wettability of glass substrates by composite resins, increase physical, mechanical and chemical bonding of composite to porcelain, and yield a greater resistance to water attack at the bonding interface. Prior to applying BIS-SILANE, the porcelain surface must be etched with PORCELAIN ETCHANT* (4% or 9.5% buffered hydrofluoric acid). This process allows porcelain to become not only highly porous, but also highly receptive to the silane by creating reactive hydroxyl groups on the surface of the porcelain.
