Objective: The aim of this study was to examine the effect of Plasma Arc Curing(PAC), conventional Quartz-Tungsten-Halogen (QTH) and Light-Emitting Diode(LED) curing units on microleakage of two shades of resin based composite in class V cavities. Methods: Thirty extracted non-carious human third molars were used. Standard class V cavities were prepared along the cemento- enamel junction on the buccal and lingual surfaces. The materials used in the study was Gluma prime/adhesive and Charisma-F. The teeth were randomly divided into three groups of ten each. Group 1: Adhesive was light cured for 1 second and composite was light cured for 3 seconds using a PAC unit (Apollo 95E). Group 2: Adhesive and composite was light cured for 20 and 40 seconds using QTH (Optilux 501) respectively. Group 3: LED (Freelight Elipar 1) curing unit was used. The curing time was 10 seconds for bonding agent and 20 seconds for composite. In all groups, A3.5 and B1 shades resin composite were applied to buccal and lingual cavities randomly. Two coats of fingernail varnish were applied all tooth surfaces with exception of 1mm around the tooth-restoration interface. The teeth were then immersed in 0.5% aqueous basic fuchsine dye for 24h at 37C. After the teeth were sectioned longitudinally, depth of dye penetration around the enamel and dentin-cementum margins was evaluated under a stereomicroscope. K-independent samples nonparametric Kruskall-Wallis H and Chi-square test were used to evaluate the statistical significance of the results of leakage score at the 0.05 significance level. Results: conclusion: Although leakage scores were seemed to be higher in the plasma ark group, the difference among three light curing units was found to be statistically nonsignificant (p> 0.05). It was also found that shade of composite resin had no effect on microleakage (p> 0.05).

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