Relationship between the Velocity of Polymerization and Adaptation to Dentin Cavity Wall of Light-cured Composite

Abstract

The relationship between the velocity of polymerization of light-cured resins and the wal1-to-wall contraction in a dentine cavity was studied. The final degree and the velocity of polymerization were determined by measuring the quantity of remaining carbon double bonds by infrared spectroscopy with respect to time. Diallylsulfonamide (DASA) as reducing agent in the experimental monomers increased both the velocity and the final degree of polymerization. Hydroquinone-monomethyl ether (MHQ) as inhibitor in the monomers decreased the velocity although its concentration did not affect the final degree. On the other hand, the wall-to-wall contraction increased with increasing content of DASA and with decreasing content of MHQ. From statistical analysis, it was found that the wa11-to-wall contraction was affected by the velocity of polymerization of composite resins, but was not affected by the final degree.