Objective
The aim of this study was to measure the volume and visually assess 3-dimensional
(3D) virtual models of pulp cavities obtained through semiautomatic segmentation on
images from 6 cone beam computed tomography (CBCT) units compared with the reference
standard of micro-CT.
Study Design
Fifteen mandibular premolar teeth were scanned with 6 CBCT units: Prexion 3D Elite,
i-CAT Next Generation, NewTom 5G, Cranex 3D, 3Shape X1, and Orthophos SL 3D, using
the smallest available field of view and highest resolution settings. Pulp cavity
volumes were quantitatively assessed by 2 calibrated examiners. The volumes from each
CBCT unit were compared with micro-CT. Qualitative assessment of the 3D reconstructions
was also performed. Repeated-measures analysis of variance and the Friedman test compared
the CBCT reconstructions to micro-CT. Intra- and interexaminer agreements were calculated
with the intraclass correlation coefficient and kappa statistic.
Results
The CBCT-based volumes were all significantly larger than micro-CT (P ≤ .0061). Prexion, X1, and Orthophos provided the segmentations that most closely
resembled the reference standard. Intra- and interexaminer agreements ranged from
good to excellent for quantitative measurements. Interexaminer agreement for qualitative
evaluation was substantial.
Conclusions
Semiautomatic segmentation of CBCT images is a feasible method to produce virtual
3D models of the pulp cavity. Prexion, X1, and Orthophos were the CBCT units that
resulted in 3D reconstructions most similar to the reference standard.
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Article info
Publication history
Published online: October 20, 2022
Accepted:
October 14,
2022
Received in revised form:
October 3,
2022
Received:
June 20,
2022
Identification
Copyright
© 2022 Elsevier Inc. All rights reserved.
