Effect of curing protocol on the polymerization of dual-cured resin cements

摘要

Objectiues. The purpose of this study was to evaluate how curing protocol affects the extentrnof polymerization of dual-cured resin cements.rnMethods. Four commercial resin cements were used (DuoLink, Panavia F 2.0, Variolink II andrnEnforce). The extent of polymerization of the resin cements cured under different conditionsrnwas measured using a ~1H Stray-Field MRI method, which also enabled to probe molecularrnmobility in the kHz frequency range.rnResults. Resin cements show well distinct behaviours concerning chemical cure. Immediaternphoto-activation appears to be the best choice for higher filler loaded resin cements (PanaviarnF 2.0 and Variolink). A photo-activation delay (5 min) did not induce any significant differencernin the extent of polymerization of all cements.rnSignificance. The extent of polymerization of dual-cured resin cements considerably changedrnamong products under various curing protocols. Clinicians should optimize the materialsrnchoice taking into account the curing characteristics of the cements.