Abstract
Introduction
A new method for the approximation of the root canal's cross-sectional shape and its
working width using cone-beam computed tomographic (CBCT) or micro–computed tomographic
(micro-CT) imaging was introduced.
Methods
Scanned data from 29 extracted human mandibular first and second molar distal root
canals without instrumentation were reconstructed and analyzed with a self-developed
measurement algorithm. The 3-dimensional volume models were sliced perpendicular to
the vertical axis. Using different 2-dimensional parametric models, the contour of
each root canal slice was approximated and used to determine the canal's cross-sectional
dimensions. The measurements of minor width, major width, and the root canal's conicity
were statistically analyzed using analysis of variance.
Results
The measured minor and major widths of the investigated root canals were significantly
higher (probability value P < .05) when evaluated by CBCT images than the results obtained from micro-CT data.
Both dimensions increased starting from the apical foramen (P < .01). The narrowest measured canal widths were 0.19–0.24 mm for CBCT imaging and
0.09–0.21 mm for micro-CT imaging in the apical part. The maximum values for conicity
were between 13% and 17% in the cervical third.
Conclusions
The 3-dimensional imaging data from CBCT and micro-CT imaging enabled a valuable anatomic
assessment of the root canal's cross-sectional working width along the canal up to
the physiological foramen in order to determine an adequate apical diameter as well
as the correct measured taper in the cervical and medial part.
Key Words
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Article info
Publication history
Published online: August 13, 2021
Identification
Copyright
© 2021 American Association of Endodontists.
