determine the post-cure depth of cure of bulk fill resin composites through
using Vickers hardness profiles (VHN).
bulk fill composite materials were examined: Tetric EvoCeram® Bulk Fill,
X-tra base, Venus® Bulk Fill, Filtek™ Bulk Fill, SonicFill™. Three specimens
of each material type were prepared in stainless steel molds which contained
a slot of dimensions (15 mm × 4 mm × 2 mm), and a top plate. The molds were
irradiated from one end. All specimens were stored at 37 °C for 24 h, before
measurement. The Vickers hardness was measured as a function of depth of
material, at 0.3 mm intervals. Data were analysed by one-way ANOVA using
Tukey post hoc tests (α = 0.05).
maximum VHN ranged from 37.8 to 77.4, whilst the VHN at 80% of max.VHN ranged
from 30.4 to 61.9. The depth corresponding to 80% of max.VHN, ranged from
4.14 to 5.03 mm. One-way ANOVA showed statistically significant differences
between materials for all parameters tested. SonicFill exhibited the highest
VHN (p < 0.001) while Venus Bulk Fill the lowest (p ≤ 0.001). SonicFill
and Tetric EvoCeram Bulk Fill had the greatest depth of cure (5.03 and 4.47
mm, respectively) and was significant’s different from X-tra base, Venus Bulk
Fill and Filtek Bulk Fill (p ≤ 0.016). Linear regression confirmed a positive
regression between max.VHN and filler loading (r2 = 0.94).
fill resin composites can be cured to an acceptable post-cure depth,
according to the manufacturers’ claims. SonicFill and Tetric EvoCeram Bulk
Fill had the greatest depth of cure among the composites examined