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Related Experiment Videos

Cementoenamel junction: microscopic analysis and external cervical resorption.

L Neuvald1, A Consolaro

  • 1Department of Pathology, Bauru School of Dentistry, São Paulo University, Bauru, Brazil.

Journal of Endodontics
|February 24, 2001
PubMed
Summary

The cementoenamel junction

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Root canal morphology of primary molars: a micro-computed tomography study.

European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry·2014

Area of Science:

  • Dental Anatomy
  • Microscopy
  • Oral Biology

Background:

  • The cementoenamel junction (CEJ) is a critical interface in human teeth.
  • Limited data exists on the precise morphology and arrangement of mineralized tissues at the CEJ.
  • Understanding CEJ variations is crucial for dental research and clinical practice.

Purpose of the Study:

  • To investigate the diverse shapes and distribution patterns of mineralized tissues at the human cementoenamel junction.
  • To characterize the topographical relationships between enamel and cementum at the CEJ.
  • To correlate CEJ morphology with potential susceptibility to cervical root resorption.

Main Methods:

  • Analysis of 198 permanent human teeth using optical microscopy (OM) and scanning electron microscopy (SEM).
  • SEM utilized to identify enamel-cementum interrelations: overlap, edge-to-edge, and gaps with exposed dentin.
  • OM employed to detect cementum-enamel overlap, a fourth observed CEJ type.

Main Results:

  • SEM revealed three distinct CEJ tissue interrelations: cementum overlapping enamel, enamel and cementum meeting edge-to-edge, and gaps with exposed dentin.
  • OM identified a fourth type: enamel overlapping cementum.
  • The distribution of enamel and cementum at the CEJ was found to be highly unpredictable and irregular across different tooth types and individual teeth.

Conclusions:

  • The human cementoenamel junction exhibits significant morphological variability in tissue arrangement.
  • Irregular CEJ patterns, including exposed dentin, may predispose the cervical region to external root resorption.
  • Further research into CEJ morphology is warranted to understand its implications for tooth stability and pathology.

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