Computed Micro-Tomographic Evaluation of Glide Path
with Nickel-Titanium Rotary PathFile in Maxillary First
Molars Curved Canals
Damiano Pasqualini, DDS,* Caterina Chiara Bianchi, MD,† Davide Salvatore Paolino, MS, PhD,‡
Lucia Mancini, PhD,§ Andrea Cemenasco, BSc,† Giuseppe Cantatore, MD, DDS,¶
Arnaldo Castellucci, MD, DDS,k and Elio Berutti, MD, DDS*
Abstract
Introduction: X-ray computed micro-tomography
scanning allows high-resolution 3-dimensional imaging
of small objects. In this study, micro-CT scanning was
used to compare the ability of manual and mechanical
glide path to maintain the original root canal anatomy.
Methods: Eight extracted upper first permanent
molars were scanned at the TOMOLAB station at ELET-
TRA Synchrotron Light Laboratory in Trieste, Italy, with
a microfocus cone-beam geometry system. A total of
2,400 projections on 360 have been acquired at 100
kV and 80 mA, with a focal spot size of 8 mm. Buccal
root canals of each specimen (n = 16) were randomly
assigned to PathFile (P) or stainless-steel K-file (K) to
perform glide path at the full working length. Speci-
mens were then microscanned at the apical level (A)
and at the point of the maximum curvature level (C)
for post-treatment analyses. Curvatures of root canals
were classified as moderate (#35 ) or severe ($40 ).
The ratio of diameter ratios (RDRs) and the ratio of
cross-sectional areas (RAs) were assessed. For each
level of analysis (A and C), 2 balanced 2-way factorial
analyses of variance (P < .05) were performed to eval-
uate the significance of the instrument factor and of
canal curvature factor as well as the interactions of
the factors both with RDRs and RAs. Results: Speci-
mens in the K group had a mean curvature of 35.4 `
11.5 ; those in the P group had a curvature of 38 `
9.9 . The instrument factor (P and K) was extremely
significant (P < .001) for both the RDR and RA parame-
ters, regardless of the point of analysis. Conclusions:
Micro-CT scanning confirmed that NiTi rotary PathFile
instruments preserve the original canal anatomy and
cause less canal aberrations.
(J Endod 2012;38:389–
393)
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