Abstract
Statement of problem
Various strategies have been proposed to reduce the cement space of foundation restorations
for endodontically treated teeth. However, they may add more operative steps, or the
dentist must keep different sizes of drills and posts in stock. A 2-piece universal
adjustable post system has been developed to overcome this problem, but whether the
system has acceptable fatigue survival performance is unclear.
Purpose
The purpose of this in vitro study was to evaluate the fatigue survival and stress
distribution of endodontically treated teeth without a ferrule and restored with different
glass fiber post strategies versus a recently introduced universal 2-piece fiber post
system.
Material and methods
Bovine incisor roots were randomly assigned to 3 groups as per the post used (n=13):
adapted glass fiber post with post space preparation of the same size, composite resin-custom
glass fiber post (CTM), and universal 2-piece glass fiber-reinforced composite resin
post (UNI). The posts were adhesively luted, the composite resin core was added, and
a composite resin crown was produced with computer-aided design and computer-aided
manufacturing (CAD-CAM), and then adhesively luted to each core. A fatigue test was
performed with the stepwise stress method (10 000 cycles/step; 20 Hz; load=100 N to
750 N; step=50 N) until fracture, and the failure mode analyzed. The stress distribution
was evaluated by finite element analysis with the maximum principal stress criteria
by following the parameters of the in vitro test. The solids were considered homogeneous,
linear, and isotropic, except for the glass fiber post (orthotropic), and a load of
450 N at 30 degrees was applied. The fatigue failure load and the number of cycles
for failure were analyzed with Kaplan-Meier and Mantel-Cox (log rank test) (α=.05).
The finite element analysis results were analyzed with colorimetric graphs.
Results
The highest fatigue failure load and the number of cycles for failure were found in
the UNI system, whereas the lowest results were found in the CTM group. All groups
exhibited repairable failures. The finite element analysis showed the lowest stress
in root dentin in the UNI system. The CTM system had the largest stress regions at
the dentin and dentin-core interface.
Conclusions
The use of a 2-piece universal glass fiber post system resulted in more fatigue behavior
compared with composite resin-custom glass fiber posts.
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Article info
Publication history
Published online: July 05, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
