Abstract
Introduction
More information regarding the ability of single files to maintain the original canal
position is required before adopting a single-file approach to cleaning and shaping.
This study compares apical transportation in curved root canals when instrumenting
with a single WaveOne (WO) file (Dentsply Tulsa Dental Specialties, Tulsa, OK) in
a reciprocating motion with that incurred when using a sequence of Twisted Files (TFs;
SybronEndo, Orange, CA) in a continuous rotating motion.
Methods
Forty mesial canals of mandibular molars were evenly allocated into 2 balanced groups
(n = 20) with a 17-mm average canal length and 20° average curvature. Canals were accessed
in a conventional manner and instrumentation was completed with a single WO file or
a series of TFs. The canals were instrumented according to the manufacturers' protocol.
Apical transportation was assessed on a comparison of the pre- and postinstrumentation
micro–computed tomographic scans at 1-, 2-, 3-, 4-, and 5-mm sections. One-way analysis
of variance was performed to assess if a significant difference between systems exists.
Results
No significant difference (P > .05) was found between the WO and TF groups. Transportation in the mesial direction
was of greater magnitude than distal transportation for both files systems. The mean
transportation in the mesial direction was 100.1 ± 8.8 μm (WO group) and 101.0 ± 10.9
μm (TF group) (P = .5), whereas distal transportation was found to be 80.9 ± 14.6 μm (WO group) and
60.3 ± 11.0 μm (TF group) (P = .3).
Conclusions
The results suggest that no difference exists between the WO file system and the conventional
multifile TF system when considering apical transportation in curved canals.
Key Words
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Article info
Publication history
Published online: October 29, 2013
Identification
Copyright
© 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
