Abstract
To appraise influence of polymerisation of restorative dental composites on physical, mechanical and chemical properties at various setting depths. The cylindrical samples (5 mm diameter, 2.5 mm height, and n = 6) of microhybrid and nanohybrid composites were fabricated. Nanohardness was performed from the surface to the core of the sample in stages, i.e., stage 1-5. Additional chemical and physical characterisations of the study materials were performed. Differences in nanohardness, and W
sl
and W
sp
values were evaluated using analysis of variance (P ≤ 0.05). Nanohardness was significantly affected between stages of dental composites (P < 0.001). Only Nanohybrid™ composite exhibited nearly same formation ratio of double bonds into polymeric carbon-carbon single bonds at different stages. The Nanohybrid™ composite exhibited lowest W
sl
and W
sp
parameters. Nanohybrid™ may have the potential to survive a harsh oral environment for a longer time compared with other composites.