Evaluation of Mechanical Properties of Newer Nanoposterior Restorative Resin Composites: An In vitro Study

INTRODUCTION: Tooth coloured restorative materials are subjected to various physical, mechanical conditions in oral conditions. Many newer composites with improved physical and mechanical properties are introduced for clinical use. There are not many clinical studies on recent composites. The aim of this study was to compare the mechanical properties of five commercially available nano composite restorative materials. MATERIALS AND METHODS: Specimens of five nano posterior composite SureFil SDR, ClearFil Majesty, Ever X, Tetric Evo Ceram bulk fill and Filtek Z350 were tested in the study. All samples were prepared According ISO 4049 and polymerized with a LED light for 40 seconds and subjected to mechanical tests for compressive strength, flexural strength, flexural modulous and nano hardness. STATISTICAL ANALYSIS: Results obtained were subjected to one way ANOVA and Turkey's post hoc test at significance (p <0.05). RESULTS: There was significant differences among composites restorative resins tested. CFM Nano hybrid composite exhibited highest hardness values. Flexural strength, flexural modulous and hardness properties of Ever X and Z350 were almost similar. Compressive strength value of Ever X was high compared with other four composites. SDR exhibited least values when compared with other composites. CONCLUSION: Differences in compressive strength, hardness, flexural strength and modulous is due to differences in percentage and type of filler particles in all composite resin material tested.