Effect of Preheating Resin Composite and Light-curing Units on the Microleakage of Class II Restorations Submitted to Thermocycling

Abstract

Clinical Relevance Deficient polymerization can occur in deeper cavities due to the dispersion of light irradiance, and it may affect microleakage of the tooth-restoration interface. When using a quartz-tungsten-halogen light-curing unit with relatively low irradiance (420 mW/cm2) to restore a Class II restoration, microleakage can be reduced if the resin-composite is heated prior to use.