Objective: to evaluate the effect of curing time on degree of conversion and depth of curing of supra-nano filled resin composite compared to a conventional one.
Methods: Thirty-six cylindrical specimens measuring two millimeter diameter and six millimeter thickness were made for the degree of conversion (DC) assessment. For cuing depth evaluation, thirty cylindrical specimens (2 mm diameter x 6 mm height). Based on the resin composite that was employed, the specimens were split into two primary groups: the ‟ES" group (supra nano-filled composite). and the ‟FZ" group (composite filled with nano hybrid). Each group was subsequently split into three subgroups (T1, T2, and T3) based on the different curing times of 1, 3, and 10 seconds. A Fourier transformed the DC. Infrared spectrometer. Transform. and the curing depth were determined using an electronic caliper. Data were tabulated and statistically analyzed.

Results: There was significantly increased in the DC with the increase of curing time regardless the type of resin composite. T3 showed the highest DC, followed by T2 while T1 showed the lowest DC. Depth of curing at T3 and T2 showed significantly higher values than T1 for both groups. At T1; ‟ES" group showed a significant higher curing depth than ‟FZ" group.

Conclusion: The increase of curing time is positively affecting both degree of conversion and depth of curing. Moreover, the short curing time was beneficial to obtain adequate depth of curing in supra-nano filled resin composite.