Abstract
Introduction: The primary goal of successful restorative treatment is the effective replacement of lost tooth structure and maintenance of the integrity of the restoration. The success of Resin composite restorations depends on many factors, including the degree of moisture control, the effects of shrinkage during polymerization and how well the resin is cured. The purpose of this study was to evaluate the effect of two LED curing units on microleakage of posterior composite resins. Methods: For determination of microleakage, standardized MO or DO box cavities were prepared on 50 human extracted premolar teeth which was divided into 5 groups. Control group were only acid etched but adhesive was not applied. All other groups were etched with 37% phosphoric acid for 15 seconds, rinsed for 30 seconds with water and blot dried, adhesive was applied and light cured. Results: FiltekTM Bulk fill composite cured with Valo curing light exhibited least microleakage when compared to all other groups. Conclusion: The study showed that control group as well as other groups exhibited microleakage but FiltekTM Bulk fill composite resin showed lesser microleakage than Tetric N-Ceram. Keywords: Bulk fill resin composite, polymerization shrinkage, curing lights, microleakage.
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