Bulk Fill Composite Resins . A Novelty in Resin - Based Restorative Materials

Composites resins are the most popular restorative materials providing very good esthetics and long period of good clinical performance. Depth of cure of composite resins is crucial in determining the maximal increment thickness when restoring tooth cavities. In restorations with conventional composite resins the thickness of each increment has been defined as up to 2 mm. Bulk fill composite resins are assumed to be curable to a thickness of 4-5 mm, develop lower polymerization shrinkage stresses and present higher light transmission properties due to reduction of light scattering at the filler–matrix interface by either decreasing the filler amount or increasing the filler size. Further studies especially in vivo are necessary to verify the improved clinical performance of bulk fill composite resins.