Comparative Analysis of Fracture Resistance of Maxillary Premolars with Class II MOD Cavities Restored with Novel Nanocomposites Including Fibre Reinforced Composite Restorative System: A Step Ahead in Composite Dentistry

Aim: To determine the influence of nanocomposites such as nanofilled, nanoceramic and fibre reinforced composite restorative systems on the fracture resistance of maxillary premolars with Class II mesio- occlusodistal (MOD) cavities. Materials and Method: Eighty sound maxillary human premolars were divided into four groups of 20 teeth each. Teeth in the first group were left intact (unprepared) and tested as positive controls. Teeth in the remaining three groups were prepared with MOD cavities and were restored with a nanofilled composite (Ice), a nanoceramic composite (CeramX mono) and a fibre reinforced composite (Tetric N Flow & CeramX mono). All groups were stored in water at 37΀C for 24 hours and thermocycled and then tested in universal testing machine. Statistical analysis was done by Kruskal-Wallis and Mann-Whitney U tests. The level of significance was set at 0.05. Results: Results between each group were statistically significant (P> 0.05) except between nanoceramic and fibre reinforced composite system. Conclusion: Under compressive load testing, all restored teeth had lower cuspal fracture resistance than unprepared control teeth. Nanoceramic showed the highest mean cuspal fracture resistance while nanofilled showed the least and fibre reinforced composite proved to be a true tooth reinforcing agent