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Vertical control in SWA, Intrusion Mechanics

  • Point of force application.
    • Intrusive force à CR à intrusion ,
    • no labial or lingual rotn. of the tooth.
    • Patients with procumbent incisors – intrusive force –
    • farther from CR –
    • ñ moment à ñ lingual root movt.
    • Management:
      • Retract ant. – upright axial incln.- intrude.
      • Apply vertical force – lingual to CR.
    •   Buccal segments maintained in an upright position,
    •    lower incisors intruded with this light, continuous pressure.
    •    Development – Step-down base arch, or Ricketts’ Lower Utility Arch.
    •   Double tube with no torque – designed.
    •   Sp. Blue Elgiloy wires – 0.016” x 0.016”
    •   Force generated – 100 gms –four incisors.

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