Abstract
Introduction
This study compared the fracture resistances and the failure patterns of 100 simulated
mandibular premolars of a different number of coronal walls (zero to four walls) with
or without fiber-reinforced composite (FRC) posts. In addition, the photoelastic stress
distribution was analyzed.
Methods
The fracture resistance was measured at a 45° angle with a crosshead speed of 1 mm/min, and the failure patterns were observed. The photoelastic stress distribution
of specimens with or without FRC posts was also evaluated. The fracture resistance
was analyzed by analysis of variance and a Duncan's multiple range test (p<0.05).
Results
In the no post groups, the fracture resistances decreased significantly in groups
with two or fewer walls. The FRC post increased fracture resistances significantly,
except for the zero-wall group, and optimized the failure patterns. A high stress
concentration was observed along the canal space in the no post groups; stress seemed
to be distributed in post groups in photoelasticity.
Conclusion
Within the limitation of the experimental methods of this study, the FRC post was
advantageous in lower premolars, especially with two or more walls in terms of the
fracture resistance and stress distribution.
Key Words
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Article info
Publication history
Published online: December 11, 2009
Footnotes
Supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (KRF-2008-531-E00071).
Identification
Copyright
© 2010 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
