Abstract
Introduction
This proof-of-principle study aimed to demonstrate that magnetic resonance imaging
(MRI) is sufficiently accurate for the detection of root canals using guided endodontics.
Methods
One hundred extracted human teeth (anterior and premolar) were mounted onto 5 mandibular
and 5 maxillary models, fitted with splints designed to accommodate a thin layer of
aqueous gel for indirect imaging, and scanned by MRI. After MRI and intraoral scans
were aligned using planning software, access cavities were planned virtually, and
templates were manufactured with computer-aided design/computer-aided manufacturing,
the access cavities were prepared. Cone-beam computed tomographic scans were performed
and matched with the virtual preoperative planning data to determine the accuracy
of access cavity preparation in terms of deviation between planned and prepared cavities
in the mesiodistal and buccolingual dimensions and angle. Descriptive statistical
analysis was performed, and the mean values were compared using the t test.
Results
Ninety-one of 100 root canals were successfully scouted after MRI-guided access cavity
preparation. The mean angle deviation was 1.82°. The mean deviation ranged from 0.21–0.31
mm at the base of the bur and from 0.28–0.44 mm at the tip of the bur. Preparation
in the buccolingual dimension was significantly more precise in mandibular compared
with maxillary teeth, and accuracy in the mesiodistal dimension was more precise in
anterior teeth compared with premolars.
Conclusions
This in vitro study demonstrated the suitability of MRI for guided endodontic access cavity preparation.
Key Words
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Article info
Publication history
Published online: March 24, 2021
Identification
Copyright
© 2021 American Association of Endodontists.
