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Anatomic Analysis of Palatal Roots of Maxillary Molars Using Micro-computed Tomography.

Katherine A Divine1, Scott B McClanahan1, Alex Fok2

  • 1Division of Endodontics, University of Minnesota School of Dentistry, Minneapolis, Minnesota.

Journal of Endodontics
|May 7, 2019
PubMed
Summary
This summary is machine-generated.

Maxillary first molars have thinner palatal root dentin and wider canals than second molars, necessitating conservative endodontic treatment. Careful instrumentation is crucial due to frequent absence of apical constriction.

Keywords:
Apical constriction anatomycanal anatomymaxillary molarpalatal rootworking width

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Area of Science:

  • Endodontics
  • Dental Anatomy
  • Micro-computed Tomography

Background:

  • Analysis of palatal root morphology in maxillary first and second molars.
  • Utilized micro-computed tomographic scanning for detailed anatomical assessment.

Purpose of the Study:

  • Compare the morphology of the palatal root between maxillary first and second molars.
  • Provide data to inform endodontic treatment strategies for these teeth.

Main Methods:

  • Micro-computed tomography scanning of 47 extracted maxillary molars.
  • Analysis of palatal radicular dentin dimensions, canal width, root length, curvature, lateral canals, and apical constriction.
  • Quantitative data analysis with unpaired t-tests for comparisons.

Main Results:

  • Maxillary first molars exhibit significantly thinner palatal root dentin in coronal and middle thirds compared to second molars.
  • First molar palatal roots show significantly wider mesiodistal canal dimensions near the cementoenamel junction/pulpal floor.
  • Significant canal curvature was observed in the analyzed roots.

Conclusions:

  • Absence of apical constriction in 76.6% of specimens underscores the need for creating an apical seat.
  • Recommends a minimum master apical file size of 40 for preoperative working widths.
  • Suggests a 3.5 mm root-end resection to address lateral canals.