Aim: The aim of this study was to evaluate the fracture resistance and microleakage of class II cavities in maxillary premolars restored with Cention-N, with and without an adhesive, silver amalgam and bulk fill composite resin. Settings and Design: This was an in vitro study. Materials and Method: A total 120 maxillary premolars were selected and divided into four groups (30 each) according to the filling material used - Group 1- Class II cavities restored with silver amalgam, Group 2- Class II cavities restored with bulk fill composite resin, Group 3- Class II cavities restored with Cention N without an adhesive, Group 4- Class II cavities restored with Cention N with an adhesive. Half of Samples were subjected tothermocycling and immersed in methylene blue dye. Samples were then sectioned longitudinally and evaluated for dye leakage under stereomicroscope. Remaining half were tested for fracture resistance under universal testing machine. Recorded results were subjected to statistical analysis. Results: The results of this study showed that Cention Nwith an adhesive showed the highest fracture resistance and lowest microleakage score followed by Cention N without an adhesive and bulk fill composite resin (Tetric N Ceram). While the specimen restored with silver amalgam showed least resistance to fracture and highest micro leakage. Statistical analysis of fracture resistance showed a highly significant difference between the groups and statistical analysis of microleakage showed a significant difference amongst the groups. CONCLUSION: Therefore, it may be concluded from the present study that Cention N when used with an adhesive provide highest resistance to fracture and lowest micro leakage amongst all the groups and thus it is suitable for posterior teeth restoration in class II cavities as a good alternative to amalgam and posterior composites.
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