All the enrolled patients was applied the Andresen Activator (a removable orthodontic appliance) 12-14 hours in a day in total.

Functional appliances helped the movement of the teeth, with the achievement of good facial muscle function. All patients in the cohort were treated with the andresen actovator appliancev for deep bite and class II malocclusion correction.

The appliances were individually manufactured of acrylic resin, with a central screw and a vestibular arch, fabricated through a wax bite registration; the patient was guided to close the mouth in mandibular protrusion with coincidence of the upper and lower midlines. The registration bite was very thin in order to obtain a minimum vertical dimension. The activator was modified every three months increasing its posterior vertical dimension in order to stimulate the mandibular ramus growth thanks to the dislocation of the mandibular condyle.

Included patients were treated for 24 months with a Functional removable orthodontic appliance, the Andresen activator. The initial checks were performed after 6 weeks with subsequent checks being carried out every 8th week, with the final follow-up at 24 months. The patient underwent functional treatment using the activator described in the protocol with midlines coincidence.

TMJ disorder and clinical mandibular symmetry was achieved or if mandibular growth was estimated as ceased.