Thursday, April 20, 2017

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="">
Conclusion

Among the cores used in this study, the composite core with high filler content tended to enhance fracture thresholds of teeth restored with fiber posts more than others.

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