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Related Experiment Videos

Anatomic Comparison of Contralateral Premolars.

Gaute Floer Johnsen1, Sazan Dara1, Sameenah Asjad1

  • 1Department of Biomaterials, Faculty of Dentistry, Institute of Clinical Dentistry, University of Oslo, Oslo, Norway.

Journal of Endodontics
|April 6, 2017
PubMed
Summary

Contralateral premolars show similar linear measurements like length and width. However, their apical anatomy, including accessory canals, lacks bilateral symmetry. The null hypothesis was accepted.

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Area of Science:

  • Dental Anatomy
  • Comparative Morphology
  • Micro-computed Tomography

Background:

  • The comparative anatomy of contralateral premolars remains largely unstudied.
  • Understanding premolar morphology is crucial for endodontic and orthodontic treatments.

Purpose of the Study:

  • To quantitatively and qualitatively compare the morphology of contralateral premolars.
  • To assess similarities in length, canal width, dentinal thickness, accessory canals, root canal configurations, isthmi, C-shapes, root canal orifices, and apical foramina.
  • To test the null hypothesis that contralateral premolars exhibit greater morphological similarity than random pairs for linear measurements.

Main Methods:

  • Micro-computed tomography (micro-CT) scanning of 41 intact premolar pairs (n=82).
  • Quantitative comparative analysis using pairwise statistical tests and Z-score normalization for morphometric parameters.
Keywords:
Anatomical symmetrycontralateral premolarsmicro-CT

Related Experiment Videos

  • Classification of canal configurations, isthmi, and registration of accessory canals and apical foramina.

    • Main Results:

    • Contralateral premolar pairs exhibited significant similarity in linear measurements (lengths, widths, thicknesses).
    • No bilateral symmetry was observed in the apical portions, specifically in foramina, C-shapes, and accessory canals.
    • Statistical analysis of normalized parameters confirmed no significant differences between contralateral pairs.

    Conclusions:

    • The null hypothesis was accepted, indicating high similarity in simple morphometric measurements of contralateral premolars.
    • Apical morphology, including accessory canals and foramina, does not display consistent bilateral symmetry.
    • Findings highlight the importance of considering individual anatomical variations, especially in the apical region.