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A.
TEZVERGIL, L.V.J. LASSILA, and P.K. VALLITTU, University
of Turku, Finland
Objectives:
This
study was aimed to investigate the degree of monomer conversion of
three dual-cure resin cements irradiated through various
restorative materials or dentine.Methods: Dual-cure resin
cements RelyX ARC (3M-ESPE), RelyX Unicem (3M-ESPE) and Variolink
2 (Ivoclar,Vivadent) was used for this study. The cements
were mixed according to the manufacturer' instructions and placed
under the discs (1.5 mm thickness) representing a metal
restoration, composite restoration (Sinfony D A3),
fiber-reinforced composite (FRC) (EverStick 1.0 mm+ 0.5 mm Sinfony
D A3) restoration and dentin. Five specimens (0.6mm thick) for
each group were irradiated through the discs for 40s (Optilux-501,
800 mW/cm2). Light polymerization of the
dual-cure cement without the covering disc was used as control.
Degree of monomer conversion (DC%) was determined by FT-IR/ATR
spectrometry from the bottom of the cement. The infrared spectra
were recorded at every 6 sec for fifteen minutes beginning after
mixing the cements.Results: ANOVA revealed significant
differences in DC% between the cements tested and the different
restorations (p<0.05). The mean DC% (SD) were:
Conclusion:
Light
irradiation through FRC-disk revealed highest DC% among groups and
was comparable to control. It can be concluded that the simulating
material of the restoration significantly influence the DC% of the
dual-curing cement underneath.
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