Highlights
- •The remaining amount of the residual filling materials in the root canals after retreatment using ProTaper Universal Retreatment (PTUR) files (Dentsply Maillefer, Ballaigues, Switzerland) alone or with the additional use of Self-Adjusting File (SAF; ReDent-Nova, Ra'anana, Israel), Reciproc (VDW, Munich, Germany), or Hedström-files (H-file; VDW, Antaeos, Munich, Germany) was compared with volumetric estimation using the stereologic method via cone-beam computed tomographic images.
- •The additional use of the SAF did not significantly improve the removal of filling materials when compared with the PTUR system alone (P > .05). However, the additional use of Reciproc or hand H-files significantly improved the removal of filling materials when compared with the PTUR system alone (P < .05).
- •Modern stereologic methodology seems to be a reliable, accurate, and promising method for estimating the remaining volume of residual root canal filling material after the retreatment procedures.
- •The additional use of files with different motion kinetics improved the removal of root canal fillings; however, none of the systems completely removed the root canal filling material from the root canals.
Abstract
Introduction
The aim of this study was to estimate the remaining amount of residual filling materials
in root canals after retreatment using ProTaper Universal Retreatment (PTUR) files
(Dentsply Maillefer, Ballaigues, Switzerland) alone or with the additional use of
the Self-Adjusting File (SAF; ReDent-Nova, Ra'anana, Israel), Reciproc (VDW, Munich,
Germany), or Hedström-files (H-file; VDW, Antaeos, Munich, Germany) with volumetric
estimation using the stereologic method via cone-beam computed tomographic images.
Methods
Forty-eight mandibular premolars with single canals were used. The canals were instrumented
with ProTaper rotary instruments up to F4 and filled with gutta-percha and AH26 sealer
(Dentsply De Trey, Johnson City, TN). All the samples were placed into the silicone
models. Samples were scanned with cone-beam computed tomographic imaging and assigned
into 4 groups (n = 12) according to retreatment files: the PTUR system group, the PTUR system plus
SAF group, the PTUR system plus Reciproc group, and the PTUR system plus H-file group.
The specimens were rescanned after retreatment procedures, and the volume estimations
of the remaining filling materials were performed using the stereologic method. Data
were analyzed using Kruskal-Wallis and Dunn tests.
Results
There was no significant difference among the groups regarding mean percentage volumes
of the filling materials before retreatment procedures (P > .05). None of the retreatment procedures provided complete removal of the filling
materials. The additional use of the SAF did not significantly improve the removal
of filling materials when compared with the PTUR system alone (P > .05). However, the additional use of Reciproc or hand H-files significantly improved
the removal of filling materials when compared with the PTUR system alone (P < .05).
Conclusions
The additional use of files with different motion kinetics improved the removal of
root canal fillings; however, none of the systems completely removed the root canal
filling material from the root canals.
Key Words
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Article info
Publication history
Published online: January 06, 2016
Identification
Copyright
© 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
