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Related Experiment Videos

Treatment timing for rapid maxillary expansion.

T Baccetti1, L Franchi, C G Cameron

  • 1Department of Orthodontics, The University of Florence, Italy. condax@tin.it

The Angle Orthodontist
|October 19, 2001
PubMed
Summary

Rapid Maxillary Expansion (RME) before skeletal growth peaks yields greater long-term craniofacial changes. Early treatment with the Haas appliance significantly enhances transverse dimensions, particularly in the nasal and maxillary regions.

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Area of Science:

  • Orthodontics
  • Craniofacial Biology
  • Growth and Development

Background:

  • Rapid Maxillary Expansion (RME) is a common orthodontic treatment for transverse discrepancies.
  • The timing of RME relative to skeletal maturation may influence treatment outcomes.
  • Understanding the long-term effects of RME based on growth velocity is crucial for effective treatment planning.

Purpose of the Study:

  • To evaluate the short-term and long-term effects of RME using the Haas appliance.
  • To compare treatment outcomes in subjects treated before and after the pubertal skeletal growth peak.
  • To assess transverse changes in dentoalveolar and craniofacial structures.

Main Methods:

  • A sample of 42 patients treated with the Haas appliance and 20 controls were analyzed.

Related Experiment Videos

  • Cervical vertebral maturation (CVM) assessed skeletal maturation.
  • Posteroanterior cephalograms were used for transverse measurements at pretreatment, post-expansion, and long-term follow-up.

    • Main Results:

    • Early treatment (before pubertal peak) showed greater short-term increases in nasal cavity width.
    • Long-term, early treatment resulted in significantly greater maxillary skeletal width, intermolar width, lateronasal width, and lateroorbitale width.
    • Late treatment (during/after pubertal peak) showed significant increases in lateronasal and intermolar widths.

    Conclusions:

    • Rapid Maxillary Expansion before the skeletal growth peak induces more pronounced transverse craniofacial changes at the skeletal level.
    • Treatment timing is a critical factor influencing the magnitude and extent of skeletal changes following RME.
    • The Haas appliance is effective in achieving significant transverse skeletal changes when applied at the appropriate growth stage.