Abstract
Introduction
The aim of this study was to explore the influence of retreatment procedures on the
appearance of defects on the root canal walls.
Methods
Two hundred mandibular premolars were divided into 4 groups. One group was left unprepared.
The rest of the teeth were prepared with ProTaper files up to size F4 and filled with
gutta-percha and AH26. One group was left filled and received no further treatments.
The filling material was removed from the remaining teeth either with ProTaper retreatment
files or with Hedström files. Roots were then sectioned and inspected under a microscope.
Data were analyzed with the nominal regression test (α = 0.05).
Results
No defects were observed in the unprepared group. Retreatment groups showed significantly
more defects than the initial treatment group (P < .05).There was no difference between the appearance of defects after retreatment
with Hedström files and ProTaper retreatment files. The remaining dentin thickness
and level of the root did not significantly influence the appearance of defects.
Conclusions
Retreatment procedures result in more defects than initial treatment. When assessing
the outcomes of endodontic retreatment, the substantial damage to the root canal walls
should be considered.
Key Words
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Article info
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Copyright
© 2011 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
