T-Rex Appliance

The T-Rex Appliance is used to distalize the molars and expand the arch in two phases. Effective arch development is achieved with pre-activated .032 TMA wire, an expansion screw, and rests on the premolars. After expansion, It produces a wide swinging arc of force from the midline of the palate to the upper molars producing a pendulum motion of the spring.  A wire is welded to the band and embedded in the acrylic preventing the activation of the springs while expansion is occurring. When transverse arch development is complete, the clinician cuts the welded wire causing the springs to activate and distalize the molars. An adjustment loop can be added to the spring to aid in rotation of the molars. Lingual sheaths are spot welded onto the band and can be provided by the lab