Abstract
Introduction
This study aimed to use micro–computed tomographic imaging to analyze the quality
of the endodontic preparation of mesial canals in mandibular molars provided by 3
instrumentation protocols.
Methods
Forty-five extracted mandibular molars with 2 independent mesial canals were selected,
and the initial micro–computed tomographic imaging was performed. The initial volume
values of the canals were submitted to statistical analysis for paired division. The
groups were determined according to the final enlargement of the canal and the working
length adopted (ie, G25.06/+1 mm, G35.05/foramen, and G50.01/−1 mm). At the end of
each instrumentation sequence, the root canals were scanned and analyzed with regard
to the increase in the total and apical volume, centralization, and preparation transportation
and the percentage of the total and apical uninstrumented walls.
Results
For the intragroup comparison, the Wilcoxon test was used, and for the intergroup
analysis, the Kruskal-Wallis and Dunn tests were used (P < .05). In the analysis of the canal total volume, a statistical difference was found
between G25.06/+1 mm and the remaining groups (P < .05). In the apical third, a statistical difference was observed between G25.06/+1 mm
and G50.01/−1 mm (P < .05). No statistical difference was found between the groups in terms of centralization
and transportation of the preparation or in terms of the percentage of the total or
apical uninstrumented walls.
Conclusions
The preparation of the mesial canals of mandibular molars up to larger tip files but
with a lower taper at 1 mm before the foramen resulted in a larger volume of apical
preparation, kept the preparation centralized, and provided safe apical dentin wear
without excessive cervical wear.
Key Words
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Article info
Publication history
Published online: June 14, 2021
Identification
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© 2021 American Association of Endodontists.
