Geometric Analysis of Root Canals Prepared by Four Rotary NiTi Shaping Systems
Ahmed Abdel Rahman Hashem, BDS, MSc, PhD,* Angie Galal Ghoneim, BDS, MSc, PhD,†
Reem Ahmed Lutfy, BDS, MSc, PhD,† Manar Yehia Foda, BDS, MSc, PhD,† and Gihan Abdel Fatah Omar, BDS, MSc, PhD‡
Abstract
Introduction: A great number of nickel-titanium (NiTi)
rotary systems with noncutting tips, different cross-
sections, superior resistance to torsional fracture,
varying tapers, and manufacturing method have been
introduced to the market. The purpose of this study
was to evaluate and compare the effect of 4 rotary
NiTi preparation systems, Revo-S (RS; Micro-Mega,
Besancon Cedex, France), Twisted file (TF; SybronEndo,
Amersfoort, The Netherlands), ProFile GT Series X (GTX;
Dentsply, Tulsa Dental Specialties, Tulsa, OK), and Pro-
Taper (PT; Dentsply Maillefer, Ballaigues, Switzerland),
on volumetric changes and transportation of curved
root canals. Methods: Forty mesiobuccal canals of
mandibular molars with an angle of curvature ranging
from 25 to 40 were divided according to the instru-
ment used in canal preparation into 4 groups of 10
samples each: group RS, group TF, group GTX, and
group PT. Canals were scanned using an i-CAT CBCT
scanner (Imaging Science International, Hatfield, PA)
before and after preparation to evaluate the volumetric
changes. Root canal transportation and centering ratio
were evaluated at 1.3, 2.6, 5.2, and 7.8 mm from the
apex. The significance level was set at P # .05. Results:
The PT system removed a significantly higher amount of
dentin than the other systems (P = .025). At the 1.3-mm
level, there was no significant difference in canal trans-
portation and centering ratio among the groups.
However, at the other levels, TF maintained the original
canal curvature recording significantly the least degree
of canal transportation as well as the highest mean
centering ratio. Conclusions: The TF system showed
superior shaping ability in curved canals. Revo-S and
GTX were better than ProTaper regarding both
canal transportation and centering ability.
Key Words
Computed tomography, canal transportation, root canal volume, twisted file, Revo-S,
GTX, ProTaper, nickel-titanium instruments
(J Endod
2012;38:996–1000)
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