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Related Experiment Videos

Masticatory function in normal and crowded occlusion using Hellman's dental stages

S Hinotume1, T Morinushi, T Ogura

  • 1Department of Pediatric Dentistry, Kagoshima University Dental School, Japan.

The Journal of Clinical Pediatric Dentistry
|January 1, 1994
PubMed
Summary

This study found that fewer interocclusal points in crowded dental groups correlate with altered masticatory muscle activity. Maintaining occlusal harmony is crucial for normal chewing patterns.

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Area of Science:

  • Dentistry
  • Biomechanics
  • Physiology

Background:

  • Masticatory rhythm and muscle activity are essential for oral function.
  • Dental occlusion significantly influences masticatory patterns.
  • Understanding these relationships is key to diagnosing and treating occlusal disorders.

Purpose of the Study:

  • To investigate the relationship between interocclusal point number and masticatory muscle integrated values.
  • To compare masticatory patterns in normal occlusion versus dental crowding groups.
  • To identify factors contributing to characteristic masticatory patterns in dental crowding.

Main Methods:

  • Electromyography (EMG) was used to measure integrated electromyograph values.
  • Masticatory rhythm was analyzed in subjects with normal occlusion and dental crowding.

Related Experiment Videos

  • Interocclusal point numbers were quantified across different dental stages (IIA, IIIA, IIIC, IVA).

    • Main Results:

    • In normal occlusion, total active potential (TA%) decreased with dental stage advancement, while M% increased.
    • Crowded groups showed a TA-M-type masticatory pattern even in later stages (IIIC).
    • Significantly fewer interocclusal points were observed in crowding groups at molar segments (IIIC, IVA).

    Conclusions:

    • The number of interocclusal points is a key factor in the masticatory pattern observed in dental crowding.
    • A well-harmonized status of upper and lower occlusion is vital for normal masticatory function.
    • These findings highlight the importance of occlusal stability in maintaining efficient chewing.