Abstract
Introduction
This study compared the residual tooth strength and stress distribution of a mandibular
molar prepared with different variable tapered file systems using finite element analysis
(FEA).
Methods
Two preaccessed mandibular molar TruTeeth (Endo 3DP; Acadental, Lenexa, KS) were subjected
to simulated endodontic treatment in this study. One tooth was instrumented with ProTaper
Gold (Dentsply Tulsa Dental Specialties, Tulsa, OK), and the other was instrumented
with V-Taper 2H (SS White Dental, Lakewood, NJ). The 2 teeth were scanned using micro–computed
tomographic imaging, and stereolithographic surface meshes were developed for FEA.
Each model was subjected to a 200-N multipoint load-simulating mastication. The results
of the FEA provided quantitative and qualitative measurements for von Mises stress
distribution and total deformation.
Results
The maximum von Mises stress was greater in the ProTaper Gold–prepared model than
the V-Taper 2H prepared model. In both models, total deformation values were highest
in the clinical crown on the buccal aspect of the tooth. The highest stress values
were found in the pericervical dentin, and stress decreased apically through the root.
Conclusions
Within the limitations of this study, it can be concluded that the maximum stress
values within the tooth prepared by ProTaper Gold were higher than those in the tooth
prepared by V-Taper 2H. Canal preparation with the V-Taper 2H system preserves more
pericervical dentin, which may increase the resistance to fracture.
Key Words
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Article info
Publication history
Published online: March 24, 2021
Accepted:
March 16,
2021
Received in revised form:
March 14,
2021
Received:
December 18,
2020
Identification
Copyright
© 2021 American Association of Endodontists.
