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Related Experiment Videos

Occlusal contacts in maximum intercuspation in normal dentitions

W E McDevitt1, A A Warreth

  • 1Department of Restorative Dentistry and Periodontology, School of Dental Science, Trinity College, Dublin, Ireland.

Journal of Oral Rehabilitation
|December 31, 1997
PubMed
Summary

This study found wide variability in occlusal contacts during maximum intercuspation, challenging traditional theories. Interventions should focus on maintaining or increasing stabilizing occlusal contacts.

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Area of Science:

  • Dentistry
  • Biomechanical Engineering
  • Dental Occlusion Research

Background:

  • Understanding occlusal contacts in maximum intercuspation is crucial for dental health.
  • Classical theories on occlusal contact distribution and nature lack empirical support.
  • Variability in occlusal contacts exists within healthy dentitions.

Purpose of the Study:

  • To describe the distribution, numbers, and types of occlusal contacts in subjects with normal dentitions.
  • To identify the prevalence of teeth without occlusal contact.
  • To evaluate the stabilizing and unstabilizing effects of occlusal contacts.

Main Methods:

  • A cross-sectional study utilizing a validated method for identifying occlusal contacts.
  • A randomized sample of 38 adults (18 women, 20 men) with normal dentitions and masticatory systems.

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  • Analysis of contact distribution, classification (number, type), and teeth without contact.

    • Main Results:

    • Classical theoretical proposals regarding occlusal contacts were not supported by the findings.
    • Significant variability and asymmetry in occlusal contact distribution were observed.
    • Mandibular supporting cusps were involved in 79% of stabilizing contacts, with no significant difference between stabilizing and unstabilizing contacts.
    • Mechanically unstabilizing occlusal contacts did not lead to clinically discernible adverse effects.

    Conclusions:

    • Occlusal contact patterns exhibit wide individual variability and asymmetry.
    • The number of stabilizing occlusal contacts is often sparse.
    • Dental interventions targeting occlusal surfaces should aim to preserve or enhance stabilizing contacts in maximum intercuspation.