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MARPE vs SARPE for Adult Maxillary Transverse Deficiency

Anisha ValliLeave a comment

MARPE vs SARPE for Adult Maxillary Transverse Deficiency

PATIENT SELECTION

MARPESARPE
Post-pubertal adolescents and adults with transverse maxillary deficiencyAdults with severe transverse deficiency requiring surgical intervention
Patients seeking a less invasive alternativePatients unsuitable for nonsurgical expansion or with failed previous expansion
Desire for greater skeletal expansion and reduced dental side effectsWhen surgical correction is already planned

APPLIANCE DESIGN

MARPE

  • Hybrid expander with 4 palatal miniscrews
  • Force delivered closer to maxillary center of resistance
  • Activation: 2/4 turn immediately, then 2/4 turn daily until correction

SARPE

  • Le Fort I subtotal osteotomy
  • Midpalatal and pterygomaxillary disjunction
  • Hyrax-type expander
  • Activation: 1/4 turn twice daily

KEY CLINICAL DIFFERENCES

Skeletal Expansion

✅ MARPE Superior

  • Greater midfacial expansion
  • Greater posterior maxillary base expansion
  • Greater nasal cavity widening
  • Greater posterior palatal expansion

Alveolar Expansion

≈ Similar between MARPE and SARPE

Dental Effects

✅ MARPE Advantage

  • Less molar tipping
  • Less premolar tipping
  • Less dentoalveolar compensation

⚠️ SARPE

  • Greater intermolar width increase
  • Greater interpremolar width increase
  • More buccal inclination of supporting teeth

EXPANSION PATTERN

MARPE

  • Parallel expansion (coronal view)
  • Parallel expansion (axial view)
  • Better posterior opening
  • More orthopedic effect

SARPE

  • Triangular opening (coronal view)
  • V-shaped opening (axial view)
  • Greater anterior than posterior expansion
  • More dentoalveolar contribution

AIRWAY EFFECTS

MARPE

  • Greater increase in nasal cavity width
  • Potentially greater improvement in nasal airflow

SARPE

  • Airway improvement present
  • Skeletal airway changes less pronounced

CLINICAL PEARLS

✓ If the goal is maximum skeletal expansion with minimal dental side effects → Choose MARPE

✓ If the patient requires surgical correction or has severe skeletal resistance → Consider SARPE

✓ MARPE provides:

  • More skeletal change
  • Better posterior expansion
  • Less tooth tipping
  • Better periodontal preservation

✓ SARPE provides:

  • Larger intermolar width gain
  • Greater dental expansion
  • More buccal tipping

TAKE-HOME MESSAGE

MARPE = More Bone, Less Tooth Movement

SARPE = More Tooth Movement, More Surgical Involvement

For most young adults with transverse maxillary deficiency, MARPE can be considered the preferred first-line option before proceeding to SARPE.

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