Effect of light irradiation and primer application on polymerization of selfadhesive resin cements monitored by ultrasonic velocity

Abstract

In this study, we investigated the effect of light irradiation and primer/adhesive application on the polymerization reaction and elastic modulus (E) of self-adhesive resin cement (SAC) through ultrasonic velocity (V) measurements. The V values of longitudinal and shear waves were determined based on the transit time through the specimens and specimen thicknesses, and were used to calculate the E values. Analysis of variance and Tukey tests revealed that V increased rapidly, reaching a plateau at 2,700-2,900 m/s, when the SACs were light-irradiated. However, the increasing rate of V was retarded for the non-irradiated SACs. In addition, when the primer/adhesive was applied, higher E values were obtained after 24 h. Finally, the polymerization behavior of the SACs was affected by light irradiation and primer application, and the use of prime/adhesive might improve mechanical properties. In clinical situations, use of primer/adhesive is recommended for getting proper adhesion.

Impact of adhesive primer and light‐curing on polymerization kinetics of self‐adhesive resin cement in association with free radical reaction

“…To overcome this problem by establishing better adhesion, application of an adhesive primer containing acid-functionalized methacrylate monomers and polymerization initiators may be beneficial [6]. The adhesive primer, when applied to the tooth surface, may not only provide etching and priming effects, but also further the polymerization of the resin-based cement [12], which is known as the "touch-cure" effect [13,14].…”