LEONE fastback

Leone Fast Back

The “fastback” is an appliance used for the distalization of the upper molars. This device provides the translation movement of the molars using a predetermined amount of pressure. There is no need for the cooperation of the patient maintaining good anchorage control. The principle of this device is based on the compression of Ni-Ti springs (available is 200 or 300 grams) which exert a constant force on the molar. To achieve this result, while still enabling precise control of tooth movement and ensuring the greatest comfort possible for the patient, an arm is fabricated to fit into a small tube (1.1 mm diameter) which is soldered to the palatal surface of the bands on the molars to be distalized. An open Memoria® spring is added to the arm and delivers the required force to move the tooth in the desired direction, which is determined by the arm sliding inside the tube.

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Treatment & Care

The spring must be reactivated after the tooth has retracted approximately 1.5 – 2 mm: the operator activates the distal screw as required so that it compresses the spring again (after distalization has begun, activation should be carried out, on average, every 30 – 45 days). The springs can be reactivated each month through the expansion screws integrated into the device. The pre-welded tube on the molar band enables the screw arm to slide smoothly with total control of the direction of distalization. Once the desired amount of distalization is achieved, an eyelet is available on the end of the slider to tie a ligature wire from the band to the appliance to hold the movement.

Additional resource:
Distalization Using the FAST BACK Expansor

This appliance should be cleaned every day with toothpaste and a soft toothbrush, morning and night. Encourage the patient to give sufficient time to clean thoroughly around the appliance, gums, teeth, and bands to maintain proper hygiene and prevent inflammation. 3 minutes is recommended.


  • FastBack: Leone Fast Back Kit
  • Acrylic: JBC Monomer and Polymer

Attachment & Band options:

  • AO Maximum Retention Bands
  • Leone Web Bands
  • AO .022 Slot w/ Hook
  • AO Headgear and .022 Slot with Hook
  • AO MBT w/hook
  • AO Double Slot w/ Hook