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.