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[Observations of interproximal contact relationship during function].

K Kasahara1

  • 1Department of Fixed Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University.

Kokubyo Gakkai Zasshi. the Journal of the Stomatological Society, Japan
|February 3, 2000
PubMed
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Molar teeth do not touch adjacent teeth when at rest but establish contact during clenching. This study observed interproximal spaces closing during biting forces, confirming dynamic tooth contact.

Area of Science:

  • Dentistry
  • Biomechanics
  • Oral Physiology

Background:

  • Previous research indicated molar teeth pulsate at rest and displace during clenching.
  • These findings suggested a lack of interproximal contact at rest and reduced spacing during clenching.

Observation:

  • This study utilized a Charge-Coupled Device (CCD) microscope for in vivo observation of interproximal contact in two subjects.
  • Light transmission from the lingual to buccal side indicated a space between teeth at rest.
  • Dynamic observation with a light source on a lingual plate showed the light band dividing upon clenching.

Findings:

  • Interproximal spaces, measuring 3-21 microns at rest, disappeared during clenching.
  • A digital tension gauge revealed a significant increase in interproximal force during clenching.

Related Experiment Videos

  • In vitro analysis confirmed the relationship between light band width and interproximal distance.

    • Implications:

    • Teeth are not in constant contact with adjacent teeth at rest.
    • Interproximal contact is established dynamically during masticatory or parafunctional forces.
    • Understanding these dynamics is crucial for orthodontics, prosthodontics, and periodontics.