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Related Experiment Videos

Arch perimeter changes on rapid palatal expansion.

M D Adkins1, R S Nanda, G F Currier

  • 1Department of Orthodontics, College of Dentistry, 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
|March 1, 1990
PubMed
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Rapid palatal expansion using the Hyrax appliance significantly increases arch perimeter, with premolar width changes predicting this outcome. This aids in planning non-extraction orthodontic treatments for adolescents.

Area of Science:

  • Orthodontics
  • Craniofacial Development

Background:

  • Rapid palatal expansion (RPE) is a common orthodontic treatment to widen the maxillary arch.
  • The Hyrax appliance is frequently used for RPE, but predictable outcomes are crucial for treatment planning.

Purpose of the Study:

  • To analyze the relationship between changes in maxillary arch perimeter and arch width after RPE with the Hyrax appliance.
  • To determine the predictability of arch perimeter changes based on expansion at the premolar region.

Main Methods:

  • Dental study casts from 21 adolescent patients treated with the Hyrax appliance were analyzed.
  • Measurements were taken before treatment and after stabilization (approx. 3 months).
  • Regression analysis was used to correlate changes in premolar width and arch perimeter.

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Main Results:

  • Changes in premolar width were highly predictive of changes in arch perimeter (r2 = 0.69).
  • Arch perimeter change was approximately 0.7 times the premolar expansion.
  • Buccal uprighting of posterior mandibular teeth, posterior movement of maxillary incisors, and buccal tipping of anchor teeth were observed.

Conclusions:

  • Predicting arch perimeter changes is valuable for treatment planning in RPE cases.
  • This predictability may support non-extraction orthodontic treatment strategies.
  • Understanding tooth movement patterns provides insights into biomechanical responses to RPE.