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Related Experiment Videos

Pressure from the lips on the teeth during speech.

U Thüer1, J Grunder, B Ingervall

  • 1Department of Orthodontics, University of Bern, Switzerland. thueer@zmk.unibe.ch

The Angle Orthodontist
|May 5, 1999
PubMed
Summary

Labial soft tissue pressure on teeth during speech was measured in children. Speech posture pressure (SPP) and mean speech pressure (MSP) were significantly higher than resting pressure (RP), potentially influencing tooth position.

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Area of Science:

  • Orthodontics and Dental Biomechanics
  • Speech Science and Physiology

Background:

  • Labial soft tissue pressure is a factor in tooth positioning.
  • Understanding dynamic pressures during speech is crucial for orthodontic treatment planning.

Purpose of the Study:

  • To quantify labial soft tissue pressures on teeth during speech articulation in children.
  • To analyze the relationship between different pressure measurements and their potential influence on incisor relationships.

Main Methods:

  • Measured labial pressure at three points (upper midline, lower midline, modiolus) using a water-filled pressure system and transducer.
  • Recorded speech volume and speed with a microphone and lip muscle activity via electromyography.
  • Analyzed maximal pressure during /p/ pronunciation, resting pressure (RP), speech posture pressure (SPP), time pressure integral (TPI), and mean speech pressure (MSP).

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Main Results:

  • Maximal pressure and TPI were highest at the modiolus, followed by the lower midline, and lowest at the upper midline.
  • RP and SPP were highest at the lower midline; SPP was 2-3 times RP, and MSP was 4-7 times RP.
  • Pressures at the lower midline correlated strongly with the modiolus, indicating regional pressure transmission.

Conclusions:

  • Speech posture pressure (SPP), mean speech pressure (MSP), and time pressure integral (TPI), alongside resting pressure (RP), may play a role in determining tooth positions.
  • Dynamic labial forces during speech articulation exert significant pressure on the dentition, particularly at the lower midline and modiolus.