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Related Experiment Videos

Muscle activity with the mandibular lip bumper.

A Klocke1, R S Nanda, J Ghosh

  • 1Department of Orthodontics, University of Oklahoma, Oklahoma City 73190, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|April 11, 2000
PubMed
Summary

Lip bumper treatment initially increases lip muscle activity during rest and swallowing in adolescents. However, 12 months of use did not lead to significant muscle adaptation, indicating a persistent altered muscle equilibrium.

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Area of Science:

  • Orthodontics
  • Dental Myology
  • Biomechanics

Background:

  • Lip bumper appliances are used in orthodontics to influence lip and dental arch interactions.
  • Understanding the electromyographic (EMG) response of lip muscles to orthodontic appliances is crucial for treatment efficacy.
  • Investigating muscle adaptation over time is key to assessing the long-term effects of orthodontic interventions.

Purpose of the Study:

  • To prospectively measure upper and lower lip muscle activity using surface electromyography (sEMG) during lip bumper treatment.
  • To evaluate changes in lip muscle activity at rest, during swallowing, and during speech before and after 12 months of treatment.
  • To determine if prolonged lip bumper use leads to muscle adaptation in adolescent patients.

Main Methods:

Related Experiment Videos

  • A prospective study involving 25 adolescent patients (aged 10-17 years) undergoing lip bumper treatment.
  • Surface electromyography (sEMG) recorded muscle activity of the upper and lower lips.
  • Measurements were taken with and without the lip bumper in place, during a closed lip rest position, swallowing, and specific speech tasks.

    • Main Results:

    • Lip bumper insertion significantly increased upper and lower lip muscle activity at rest (P <.001) and during swallowing (P <.05).
    • Speech-related muscle activity showed variable responses to the lip bumper.
    • No significant decrease in muscle activity was observed during the 12-month treatment period, suggesting a lack of adaptation.

    Conclusions:

    • Lip bumper appliances exert an immediate and significant influence on lip muscle activity.
    • The observed increase in muscle activity at rest and during swallowing persists throughout the 12-month treatment period.
    • The study did not provide evidence for lower lip muscle adaptation to the lip bumper appliance over the treatment duration.