Effect of different composite core materials on fracture resistance of endodontically treated teeth restored with FRC posts
Journal of Applied Oral Science
Print version ISSN 1678-7757On-line version ISSN 1678-7765
J. Appl. Oral Sci. vol.25 no.2 Bauru Mar./Apr. 2017
http://dx.doi.org/10.1590/1678-77572016-0306
Objective
This study evaluated the fracture resistance of endodontically
treated teeth restored with fiber reinforced composite posts, using
three resin composite core build-up materials, (Clearfil Photo Core
(CPC), MultiCore Flow (MCF), and LuxaCore Z-Dual (LCZ)), and a
nanohybrid composite, (Tetric N-Ceram (TNC)).
Material and Methods
Forty endodontically treated lower first premolars were restored
with quartz fiber posts (D.T. Light-Post) cemented with resin cement
(Panavia F2.0). Samples were randomly divided into four groups (n=10).
Each group was built-up with one of the four core materials following
its manufacturers’ instructions. The teeth were embedded in acrylic
resin blocks. Nickel-Chromium crowns were fixed on the specimens with
resin cement. The fracture resistance was determined using a universal
testing machine with a crosshead speed of 1 mm/min at 1350 to
the tooth axis until failure occurred. All core materials used in the
study were subjected to test for the flexural modulus according to ISO
4049:2009.
Results
One-way ANOVA and Bonferroni multiple comparisons test indicated
that the fracture resistance was higher in the groups with CPC and MCF,
which presented no statistically significant difference (p>0.05), but
was significantly higher than in those with LCZ and TNC (p<0 .05="" aligned="" flexural="" fracture="" from="" highest="" in="" loads.="" materials="" modulus="" of="" p="" ranking="" same="" tendency="" terms="" the="" values="" was="" with="">
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