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Updated: Jun 27, 2026

Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
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Surgically assisted rapid maxillary expansion: long-term stability.

Anders Magnusson1, Krister Bjerklin, Peter Nilsson

  • 1Department of Orthodontics, The Institute for Postgraduate Dental Education, Jönköping, Sweden. anders.magnusson@lj.se

European Journal of Orthodontics
|November 27, 2008
PubMed
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Surgically assisted rapid maxillary expansion (SARME) effectively corrects transverse discrepancies and shows long-term stability, with most relapse occurring within three years post-treatment.

Area of Science:

  • Orthodontics and Maxillofacial Surgery
  • Dental Research
  • Skeletal Biology

Background:

  • Transverse discrepancies in the maxilla are common orthodontic issues.
  • Surgically assisted rapid maxillary expansion (SARME) is a widely used treatment modality.
  • Long-term stability data following SARME is crucial for clinical decision-making.

Purpose of the Study:

  • To evaluate the treatment outcomes and long-term stability of SARME.
  • To compare SARME results with a matched, untreated control group.
  • To assess factors influencing transverse dimension changes after SARME.

Main Methods:

  • A cohort of 31 patients (mean age 25.9 years) treated with SARME was studied.
  • Transverse distances (canines, first molars) were measured pre-treatment, post-treatment, and long-term (mean 6.4 years).

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  • Statistical analysis included Mann-Whitney U, Spearman's rho, and Wilcoxon signed-rank tests.

    • Main Results:

    • SARME successfully corrected posterior crossbites with statistically significant expansion.
    • Long-term follow-up (mean 6.4 years) showed sustained correction, despite some reduction in transverse measurements.
    • No significant differences in transverse measurements were found between SARME and control groups at long-term follow-up, except for the maxillary first molars.
    • Relapse was most pronounced in the first 3 years post-treatment, with no significant correlation between age, gender, or expansion degree and dimensional changes.

    Conclusions:

    • SARME is an effective method for normalizing transverse discrepancies.
    • The treatment demonstrates significant long-term stability, with corrected posterior crossbites maintained over time.
    • Post-treatment dimensional changes are minimal beyond the initial 3-year period.