Evaluation of Microleakage of Recent Nano-hybrid Composites in Class V Restorations: An In Vitro Study

Introduction: Improved marginal adaptation and better bonding ability are the foremost requirements of a posterior composite. In search of providing a composite with least microleakage, this study aims to assess the ability of three Nanohybrid Composite resins (Estelite Alfa, Brilliant™ NG, Estelite Sigma Quick) to prevent microleakage in Class V resin composite restorations. Methodology: A total of 60 Class V cavities were prepared with occlusal margin in enamel and the cervical margin in dentin and cementum of sound extracted premolars. After etching and bonding, restorations were randomly assigned to one of the three equal groups (n = 20) and were restored with nanocomposites (Estelite Alpha, Brilliant™ NG, Estelite Sigma Quick), respectively. Specimens were thermocycled, immersed in Methylene blue dye, sectioned longitudinally, and analyzed for leakage at the occlusal and cervical interfaces. Kruskal–Wallis test, followed by Dunn’s post hoc Test was used to determine the intergroup and intragroup difference and Mann–Whitney U test was used to determine the signifi cant difference at enamel and cementum margin.