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Related Experiment Videos

Variable cementoenamel junction in one person.

E S Grossman1, J A Hargreaves

  • 1MRC/University of the Witwatersrand, Dental Research Institute, Johannesburg, So. Africa.

The Journal of Prosthetic Dentistry
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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The cementoenamel junction, where enamel meets cementum, shows unpredictable tissue arrangements. Cementum most often overlaps enamel, with variations even within single teeth.

Area of Science:

  • Dentistry
  • Oral Biology
  • Microscopic Anatomy

Background:

  • The cementoenamel junction (CEJ) is a critical interface in tooth structure.
  • Understanding CEJ morphology is vital for periodontal health and restorative dentistry.
  • Variability in CEJ structure can impact clinical procedures.

Purpose of the Study:

  • To examine and compare the relationships between enamel, dentin, and cementum at the CEJ.
  • To document the predominant tissue arrangements and variations at the CEJ.
  • To establish a baseline for future research on the CEJ.

Main Methods:

  • Scanning electron microscopy (SEM) was used for high-resolution imaging.
  • The CEJ of 18 human teeth from a young adult with minimal periodontal disease was analyzed.

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  • Microscopic examination focused on the arrangement of enamel, dentin, and cementum.

    • Main Results:

    • Cementum overlapping enamel was the most frequent arrangement, observed in three distinct forms.
    • Exposed dentin surfaces at the CEJ were infrequent.
    • Tooth variations included scalloping of the CEJ in five instances and differences between contralateral teeth.

    Conclusions:

    • The arrangement of enamel, dentin, and cementum at the cervical region of teeth is unpredictable and irregular.
    • These findings highlight the inherent variability of the CEJ.
    • The study provides foundational data for future investigations into CEJ morphology and cervical restorative procedures.