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Though reputed for attaining the highest bonding strength, dentin bonding systems that use self-etching primer pose a grave concern. This is because the low pH environment induced by self-etching primer may have negative effects on polymerization reactions. In this study, we used electron spin resonance spectroscopy (ESR), high performance liquid chromatography (HPLC), and dynamic viscoelastic (DV) to analyze the effects of self-etching primer on the polymerization of bonding agents. The results of ESR revealed a lower concentration of polymerization radicals in a sample consisting of bonding agent and self-etching primer than in a sample consisting of bonding agent alone. However, in the results of HPLC and DV, the quantity of unpolymerized monomers decreased and the polymer produced was highly viscous in the sample with self-etching primer. It was suggested that hydroxyethyl methacrylate copolymerized as a plasticizer of Bis-GMA and that it formed the copolymer in the interface between the primer and bonding agent.

A Study of the Effects of Self-etching Primers on the Polymerization of Bonding Agents Using Electron Spin Resonance (ESR) Spectroscopy