Fracture Toughness of Nanohybrid and Hybrid Composites Stored Wet and Dry up to 60 Days.

Statement Of Problem: Patients' demand for tooth-colored restoratives in the posterior region is increasing. Clinicians use universal nanohybrid resin composites for both anterior and posterior regions. There are few published reports comparing fracture toughness of nonohybrids and that of hybrid composite stored wet and dry.