Abstract: Objective: To evaluate effect of different activators on the coupling performance of long-chain silane between porcelain and resin. Methods: Three different types of activation agent activate the different concentration of the long-chain silane, casting porcelain surface, stir-in resin adhesive porcelain specimen.Electron microscopy (SEM) observes the surface morphology and measure bonding strength of the specimens. Results: Two bottles long-chain silane molecular bonding strength was obviously higher than one bottle, acetic acid activator bonding strength was the highest, the lowest was lauric acid group.6% long-chain silane mixed with activator bonding strength was the highest. SEM showed that the surface with acetic acid group formed plenty of, thickness uniformity of coupling agent coverage, coupling agent coverage area formed a lot of Beaded polymers in lauric acid group. Conclusion: Acetic acid should be used as the activator of long-chain silane. Acetic acid with 6% of long-chain silane group was the highest bonding strength.

Key words: Long-chain silane, Activation , Bonding strength