[Objective] The current in vitro study was performed to evaluate Vickers hardness (VHN) of two different
composite resins that were cured by using two different light curing units. [Materials and Methods] Porcelain
tube samplers were used to fabricate composite cylinders from either Tetric Evoceram BulkFill (BF;
Ivoclar/Vivadent, USA) or SonicFill composite (SF; Kerr, USA). Each composite type had 12 cylindrical
specimens, and each specimen was cured with either Blue-phase N light-cure (Bp; Polywave, Ivoclar/Vivadent,
USA) or Elipar S10 (El; Monowave, 3M ESPE, Germany). The VHN data were analyzed and tested by using
Mann-Whitney U test at a significance level of 5%. [Results] Statistical analyses demonstrated an interaction
between the type of composite and the type of light curing source. Significant differences (P<0.05) were recorded
for all groups with higher VHN hardness of SF-El and lowest for BF-El. [Conclusions] It can be concluded that
the surface hardness of bulk-fill composite is not dependent on the type of light-cure. This research was supported
by King Abdulaziz University.
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