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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. Dierences 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 &lt; 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.

Polymerisation of restorative dental composites: influence on physical, mechanical and chemical properties at various setting depths