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Mandibular arch perimeter changes with lip bumper treatment.

W S Osborn1, R S Nanda, G F Currier

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

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|June 1, 1991
PubMed
Summary

Lip bumper treatment effectively increased mandibular arch circumference and length in patients. Arch length changes were the best predictor of increased arch circumference, offering valuable insights for orthodontic treatment planning.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Craniofacial Growth

Background:

  • The mandibular arch undergoes significant development during transitional and early permanent dentition stages.
  • Orthodontic interventions are often employed to manage arch form and tooth alignment.
  • Lip bumper appliances are used to influence mandibular growth and tooth positioning.

Purpose of the Study:

  • To evaluate the effects of lip bumper treatment on mandibular arch dimensions.
  • To identify key variables influencing changes in arch circumference and length.
  • To assess the relationship between treatment duration, patient demographics, and treatment outcomes.

Main Methods:

  • A cohort of 32 patients with late transitional or early permanent dentition received lip bumper treatment.

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  • Dental casts were measured for arch perimeter, length, and width.
  • Cephalometric radiographs assessed incisor tipping and molar movement.

    • Main Results:

    • All patients exhibited an increase in arch circumference (average 4.1 mm).
    • Mean arch length increased by 1.2 mm, primarily due to incisor tipping.
    • Arch width increased (intercanine 2.0 mm, first premolar 2.5 mm), contributing to circumference changes.
    • Arch length change was the most significant predictor of arch circumference increase.

    Conclusions:

    • Lip bumper treatment positively impacts mandibular arch dimensions, increasing both circumference and length.
    • Changes in arch length are a critical factor in predicting overall arch circumference gains.
    • Treatment outcomes were independent of treatment duration, age, sex, or second molar eruption status.