Estudo retrospectivo dos efeitos da expansão rápida maxilar assistida cirurgicamente através de tomografia computadorizada Cone Beam

Abstract

This retrospective study aims to evaluate the morphological changes produced after and surgically assisted maxillary rapid expansion (ERMAC). A three-dimensional evaluation was performed with CBT and scanning of the intraoral and gingival models at the preoperative (T0) and postoperative (T1 and T2) moments in order to evaluate linear and angular movements with bone and dental changes underlying. The possible morphological alterations of the related structures were evaluated: nasopharynx volume, oropharynx volume in relation to ERMAC. The sample consisted of 15 individuals (8 males and 7 females aged 19 to 54 years) submitted to MRS. In general, ERMAC produced a significant increase in all linear distances of the maxilla. There was a greater expansion of the maxilla in the anterior region than in the posterior one. The ERMAC produced a significant increase of the skeletal dimensions of the maxilla in the transversal direction. In the airways, there was a significant increase in all patients and the greatest effects of ERMAC occurred at the dental level, with the buccal inclination of the first molars and the upper premolars being observed.