Pharyngeal airway changes after mono-maxillary advancement surgery

Abstract

Introduction/Objective Maxillary or mandibular retrognathism are common dentofacial deformities treated by combined orthodontic-surgical treatment. Surgical maxillary or mandibular advancement changes the position and strain of surrounding structures, which may also affect pharyngeal airway dimensions. The aim of this study was to evaluate and compare three-dimensional pharyngeal airway space changes in patients treated with maxillary advancement and those treated with mandibular advancement. Methods The sample consisted of 25 patients - 12 treated with maxillary advancement and 13 with mandibular advancement surgery. Nasopharyngeal (NP) volume, oropharyngeal (OP) volume, and the area of maximum constriction (AMC) in the OP were measured on cone beam computed tomography scans (2 mA / 120 kV / 12'' FOV) taken before and at least three months after surgery. Paired samples t-test was used for analyzing statistical significance of changes (p ≤ 0.05). Results Postoperative OP and NP volumes, as well as the AMC, increased insignificantly in both groups. Conclusion Results suggest that mono-maxillary surgical advancement of the maxilla or the mandible increases pharyngeal airway dimensions.

Uvod/Cilj Retrognatizam gornje vilice i retrognatizam donje vilice su česti dentofacijalni deformiteti, koji se leče kombinovanom ortodontsko-hirurškom terapijom. Hirurško pomeranje gornje ili donje vilice unapred menja položaj i napetost okolnih struktura, što takođe utiče na dimenzije faringealnih vazdušnih puteva. Cilj istraživanja bio je da se procene i uporede trodimenzionalne promene faringealnih vazdušnih puteva kod bolesnika lečenih hirurškim pomeranjem gornje ili donje vilice unapred. Metode Uzorak istraživanja se sastojao od 25 bolesnika 12 lečenih hirurškim pomeranjem gornje vilice i 13 lečenih hirurškim pomeranjem donje vilice unapred. Zapremine nazofarinksa i orofarinksa i površine najužeg dela farinksa su merene na CBCT snimcima (2 mA / 120 kV / 12'' FOV) napravljenim pre i bar tri meseca posle hirurške korekcije. Studentov t-test za uparene uzorke je korišćen za analizu statističke značajnosti promena (p ≤ 0,05). Rezultati Zapremine nazofarinksa i orofarinksa i površine najužeg dela farinka povećale su se posle hirurškog pomeranja gornje ili donje vilice unapred. Statistička značajnost nije zabeležena. Zaključak Rezultati ukazuju na to da hirurško pomeranje gornje ili donje vilice unapred dovodi do povećanja dimenzija faringealnih vazdušnih puteva.