Home / Orthodontics / RETRACTION LOOPS & SPRINGS


For unidirectional activations,flat wire is the cross section of choice because more energy can be absorbed into a spring made with a flat wire than with a any other configuration. Another advantage – problem of orientation is solved.


  • 2mm of deactivation-spring activation 4mm-m/f raises to 10:1- bodily movement
  • Further closure 1-2 mm m/f 12:1-root movement
  • Clinical situation –should not be reactivated till all three stages are completed

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