Effect of light sources and curing mode techniques of a composite resin

A polymerization plays an important role on the longevity of the composite resin restorations. Objectives: The aim of this study was to evaluate the effect of lightcuring units, curing mode techniques and storage media on sorption, solubility and biaxial ! "# specimens were made of one composite resin (Esthet-X) in a stainless steel mold (2 mm x 8 mm Ø), and divided into 24 groups (n=10) established according to the 4 study factors: light-curing units: quartz tungsten halogen (QTH) lamp and light-emitting diodes (LED); energy densities: 16 J/cm2 and 20 J/cm2; curing modes: conventional (CM) and pulsedelay (PD); and permeants: deionized water and 75% ethanol for 28 days. Sorption and # $ & '*'+!3*** 9 < # < " >+'?@B 9 F # G by three-way ANOVA followed by Tukey, Kruskal-Wallis and Mann-Whitney tests ( =0.05). I ! $ 9 # ? R* *U & YZF 16 J/cm2 and PD using 10 s produced higher sorption and solubility values than QTH. Otherwise, using CM (16 J/cm2), LED produced lower values of BFS than QTH (p<0.05). 75% ethanol permeant produced higher values of sorption and solubility and lower values of BFS than water (p<0.05). Conclusion: Ethanol storage media produced more damage on composite resin than water. In general the LED and QTH curing units using 16 and 20 J/cm2 _ ̀ F of the tested resin.