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A.-M.
LE BELL, J. TANNER, L.V.J. LASSILA, I. KANGASNIEMI, and
P.K. VALLITTU, University of Turku, Finland
Objectives: The aim of this study was to compare bonding of
composite resin luting cement to a FRC post with either
cross-linked or interpenetrating polymer network (IPN) polymer
matrix. Serrated titanium posts served as reference. Methods:
Posts with an average diameter of 1.5 mm were tested. Four
different types of prefabricated FRC posts with cross-linked
polymer matrix and two types of individually formed FRC posts with
IPN polymer matrix were tested. The individually formed posts were
light-polymerized before cementation. Holes, with a diameter of
2.0 mm, simulating a post space in a root canal, were drilled into
discs of composite resin. An auto-polymerizing composite resin
cement was used for cementing the posts into the holes. The
pull-out force was measured by pulling the post from one end using
a universal testing machine after being stored dry or thermocycled
(6000x). SEM examination was made for the bonding sites of the
posts after testing. Results: The highest pull-out force was
obtained with titanium posts. Both the type of FRC post and
thermocycling had a significant effect on the pull-out force (n=
8, ANOVA P < 0.001 and P < 0.007, respectively). Post
hoc analysis revealed that the FRC posts with IPN polymer matrix
gave significantly higher pull-out force values than the
prefabricated FRC posts with smooth surface and cross-linked
polymer matrix (P < 0.004). Conclusions:
This study
showed that the FRC posts with IPN polymer matrix could offer
better bonding to composite resin luting cement than prefabricated
FRC posts with cross-linked polymer matrix.
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