three dimensional study of upper airway in different antero-posterior jaw relationships through cone beam computed tomography

introduction: this study aims at examining the difference of pharyngeal airways in patients with different occlusion postures, hoping to im prove diagnostic methods and provide a stable treatment plan for orthodontic patients. materials and methods: the data were ga-thered through cbct radiographies of patients from a specialized center for radiology. in each occlusion group according to the performed pilot study, 30 people (90 people in 3 groups of class i, ii and iii, male and female each) were chosen as the sample. the two-di mentional cephalometric radiographs were ob tained from 3d-radio-graphs, and the patients’ malocclusion postures were de termined according overjet and anb angle, and finally grouped. next, airway volume and di mensions were measured in cross sectional. results: statistical studies showed there is a significant relationship between anteroposte-rior positions of mandible and the volume of pharyngeal airway. also, the volume of pharyn-geal airway in class iii patients is more than those of patients in class i. the volume of pha-ryngeal airway in class ii patients is also less than those of class1 patients. conclusion: pharyngeal airway in class iii is larger and in class ii smaller. therefore, consi-dering this subject can lead to improving diag-nostic ways, especially orthognatic surgery treatments, and providing a stable treatment plan for patients who need orthodentic treat-ment