Introduction: New retainers constructions taking into account the length of orthodontic treatment and the phase of retention in patients with open bite malocclusion were developed. Materials and methods: 22 patients who finished an active period of orthodontic treatment received the suggested retention appliances, made of the EssixC+ polypropylene to prevent any relapse. The stability of results was assessed 12 months after with electromyography and occlusal analysis. The mechanism of action of the orthodontic appliance was evaluated through mechanical-mathematical simulation. Results and discussion: Mechanical mathematical simulation allowed to calculate the value and angle of application of the orthodontic effort necessary to move the mandible into the right position. Conclusions: The newly developed models of orthodontic appliances allowed to increase the efficacy of the retention phase due to the convenience of their use, while also aiding further remodeling of the functional state of the dentognatic apparatus.
Keywords:- open bite malocclusion
- orthodontic appliance
- retention