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Related Experiment Videos

Maxillary protraction: treatment and posttreatment effects

R W Gallagher1, F Miranda, P H Buschang

  • 1Department of Orthodontics, Baylor College of Dentistry, Dallas, Texas 75246, 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
|June 24, 1998
PubMed
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Palatal expansion and reverse-pull face mask treatment for Class III malocclusions in children showed significant forward maxillary protraction. However, some relapse occurred post-treatment, with mandibular effects also noted.

Area of Science:

  • Orthodontics
  • Pediatric Dentistry
  • Craniofacial Development

Background:

  • Class III malocclusion is a common skeletal discrepancy in children.
  • Early intervention with orthopedic devices aims to correct maxillomandibular relationships.
  • Palatal expansion and face mask therapy are frequently used to advance the maxilla.

Purpose of the Study:

  • To evaluate the treatment effectiveness and long-term outcomes of palatal expansion and reverse-pull face mask therapy in children with Class III malocclusions.
  • To assess skeletal and dental changes following treatment and identify any post-treatment relapse.
  • To analyze the effects on maxillary and mandibular growth and incisor positioning.

Main Methods:

  • A sample of 22 children with Class III malocclusions underwent treatment with palatal expansion and a reverse-pull face mask.

Related Experiment Videos

  • Treatment involved a protraction force of 600-800 gm until a 2 mm positive overjet was achieved.
  • Cephalometric radiographs were taken at three time points: before treatment (T1), immediately after treatment (T2), and 1.4 years post-treatment (T3).
  • An untreated control group of age and sex-matched children was used for comparison.

    • Main Results:

    • The anterior maxilla showed significant forward protraction (1.6 mm/year) compared to controls.
    • Inferior displacement of the posterior maxilla was observed, exceeding anterior displacement.
    • The mandible rotated downward and backward, with lower incisor uprighting, potentially due to a chincup effect from the face mask.
    • Post-treatment, anterior maxillary relapse and posterior maxillary upward movement occurred, partially reversing treatment gains.
    • The mandible returned to a normal growth pattern, and lower incisors showed increased flaring.

    Conclusions:

    • Palatal expansion and reverse-pull face mask therapy effectively achieve anterior maxillary protraction in growing children with Class III malocclusions.
    • While initial results are encouraging, some degree of maxillary relapse is expected after treatment cessation.
    • The therapy can influence mandibular rotation and incisor inclination, necessitating careful monitoring during the retention phase.