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Related Experiment Video

Updated: Jul 7, 2025

3D Imaging of PDL Collagen Fibers during Orthodontic Tooth Movement in Mandibular Murine Model
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Internal Morphology of Mandibular Second Premolars Using Micro-Computed Tomography.

Thomas Gerhard Wolf1,2, Samuel Basmaci1, Sven Schumann3

  • 1Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, CH-3010 Bern, Switzerland.

Journal of Imaging
|December 22, 2023
PubMed
Summary

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Micro-computed tomography revealed 12 root canal configurations in mandibular second premolars from a Swiss-German population. Most teeth had single canals, but accessory canals were common, especially in the apical third.

Area of Science:

  • Endodontics
  • Dental Anatomy
  • Radiology

Background:

  • Understanding root canal morphology is crucial for successful endodontic treatment.
  • Mandibular second premolars exhibit significant anatomical variations.
  • Previous studies on root canal morphology have focused on different populations or tooth types.

Purpose of the Study:

  • To investigate and classify the root canal morphology of mandibular second premolars (Mn2P) in a mixed Swiss-German population.
  • To determine the prevalence of different root canal configurations (RCC) and accessory canals using micro-computed tomography (micro-CT).

Main Methods:

  • 102 mandibular second premolars from a Swiss-German population were analyzed using a micro-CT unit.
  • Three-dimensional imaging software was employed to describe root canal configurations using a four-digit code.
Keywords:
internal morphologymandibular second premolarmicro-CTnumber of canalsroot canal configuration

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  • The number and location of main foramina and accessory canals were documented.

    • Main Results:

    • Twelve distinct root canal configurations were identified.
    • The most frequent configuration was 1-1-1/1 (54.9%), followed by 1-1-1/2 (14.7%) and 1-1-2/2 (10.8%).
    • Accessory root canals were present in nearly two-thirds of the sample, predominantly in the apical third (55.9%).
    • Multiple main foramina (≥3) were observed in approximately 10% of the teeth.

    Conclusions:

    • Mandibular second premolars in this population exhibit diverse root canal morphology.
    • The prevalence of accessory canals, particularly in the apical region, highlights the complexity of endodontic treatment in these teeth.
    • The findings provide valuable anatomical data for endodontic diagnosis and treatment planning in the studied population.