Abstract

Aim The aim of the study is to evaluate morphological changes in upper airways in patients undergoing therapy with removable functional orthopedic devices used in the treatment of the II skeletal classes by mandibular retraction. Materials and methods 15 patients treated with mandibular thrust have been selected and the digital images of later-lateral teleradiographs prior to treatment and subsequent treatment have been retrieved. Cephalometric analyzes were performed using the Delta-Dent software. Results The cases treated with Occlus-o-Guide (OG) compared with the cases treated with activators of Andresen (A) and Frankel (F) had a greater effect on decreasing ANB, greater inhibition of maxillary protrusions, a general increase in Ar-Pog; Cases treated with F showed a slight increase in the angle of divergence with respect to cases treated with A and lower mandibular forward stimulation than Andresen activator treated cases, a greater increase in the depth of the upper portion of the oropharynx with activator of A and F compared to OG. Conclusions The treatment of skeletic classes II by mandibular retrusion involves an increase in the postero-front extension of the pharynx. The effects of the 3 mandibular propulsions are superimposable.

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