>Year 2016, Issue 54
Kogan BA, Kogan FE, Gutiérrez VDH
Comparative study of depth of cure and hardness between two “bulk-fill” resin systems using a high intensity light with two different polymerization times
Oral 2016; 17 (54)
PDF: 500.46 Kb.
Introduction. In resin restorations it is recommend to place no more than to two mm layers, and cure before applying next one; however,
new "Bulk- Fill" systems or mass application states that can be polymerized in one intention with a limit of 5 mm. Objective. Compare
the depth of cure and hardness between two "Bulk-fill" resin systems and its relation with exposure time using a high intensity photopolymerization
unit. Methods. Six resin samples on four groups of two "Bulk-Fill" systems were included (two of each group): SonicFill
photopolymerized resin (Kerr®) and Fill-Up dual cure resin (Coltène / Whaledent®) the were prepared in prefabricated stainless steel
cylinders (8x4mm), light cured for three seconds (3000 mW/cm2) and 15 seconds (1600 mW/cm2) using LED lamp SPEC3 (Coltène/
Whaledent®) then were extracted from the molds. The length of polymerized resin was measured with digital calipers. The samples were
sectioned longitudinally and measured in millimeters, depth of cure and hardness from one to 6 mm. To compare the groups ANOVA
test was done. Results. Statistically significant differences (p ‹ 0.001) were found in Fill-Up at three seconds (7.96 ± 0.03 mm) and 15
seconds (7.95 ± 0.03mm) compared to the SonicFill system for both time (6.28 ± 0.19mm and 7.20 ± 0.41mm respectively). In the
multiple comparison of each system at different times, differences between SonicFill samples where found (p ‹ 0.001), but not with Fill-
Up (p › 0.05). With respect to the hardness, Fill-Up showed better results within 6 mm deep at 3 and 15 seconds (78.52 ± 4.20 and
85.08 ± 4.00) compared to SonicFill (53.05 ± 2.24 and 69.20 ± 3.50) (p ‹ 0.001) . Conclusions. Fill-up system at 3 and 15 seconds
has greater depth of cure and hardness that allows better increments up to 6 mm tan SonicFill.
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>Year 2016, Issue 54