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Related Experiment Videos

Maxillary expansion: a meta analysis.

P H Schiffman1, O C Tuncay

  • 1Department of Plastic and Reconstructive Surgery, Children's Hospital of Philadelphia; Department of Orthodontics, Temple University, School of Dentistry, Philadelphia.

Clinical Orthodontics and Research
|September 13, 2001
PubMed
Summary
This summary is machine-generated.

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Maxillary expansion, a dental treatment, shows limited long-term stability. Most achieved expansion is lost after retainer removal, with final results comparable to natural growth. Further research is needed for definitive conclusions.

Area of Science:

  • Orthodontics
  • Craniofacial development
  • Evidence-based dentistry

Background:

  • The long-term efficacy of maxillary expansion remains debated despite over a century of use.
  • Meta-analysis offers an objective approach to evaluating treatment modalities like maxillary expansion.

Purpose of the Study:

  • To objectively assess the stability and long-term outcomes of transverse maxillary expansion in humans.
  • To quantify the amount of expansion retained after treatment and during the post-retention period.

Main Methods:

  • A systematic literature search of Medline (1978-1999) identified studies on maxillary/palatal expansion.
  • Inclusion criteria focused on English-language human studies; 12 articles were selected after initial screening.
  • A blinded review process with a cumulative 'Meta evaluation score' was used; six studies met final analysis criteria.

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Main Results:

  • The average initial expansion was 6.00 mm (SD 1.29 mm).
  • Retention during appliance wear averaged 4.89 mm.
  • Short-term post-retention (<1 year) showed 4.71 mm residual expansion, decreasing to 3.88 mm in the short-term and 2.4 mm in the long-term (>1 year).

Conclusions:

  • Long-term maxillary expansion stability is questionable, with significant relapse observed post-retention.
  • The residual expansion after one year is minimal and comparable to normal craniofacial growth.
  • Insufficient data exists to support the claim of significant, useful expansion beyond natural growth.