Análise tridimensional do volume da via aérea superior e da posição da coluna cervical após cirurgia ortognática com avanço e rotação anti-horária do complexo maxilo-mandibular

Abstract

The present study aimed to evaluate the alteration of the airway volume and cervical spine position of patients submitted to bimaxilary orthognathic surgery with counterclockwise rotation of the occlusal plane. Cone beam computed tomography (CBCT) scans of 44 patients, facial pattern II who underwent orthognathic surgery with advancement and counterclockwise rotation of maxillo-mandibular complex were evaluated. Airway and cephalometrics measurements were obtained before surgery (T1), immediately after surgery (T2) and at least 09 months after surgery (T3) using Dolphin Imaging® 11.8. The airway parameters, such as area, minimum axial area (MAA) and volume (AIW) were significantly increased after surgery (P ≤0.01). There was also a significant difference in head posture on post-surgical follow-up (T3-T1), based on changes of OPT.SN angle (mean value 2.9°) and of CVT.SN angle (mean value 3.5°). Significant correlations between the increased of upper airway, surgical movements and changes in head posture were found (P ≤0.05). Therefore, according to these results, orthognatic surgery with advancement and counterclockwise rotation of maxillomandibular complex can increase the upper airway dimensions and improve the head posture.