QUANTIFYING VOLUMETRIC, SURFACE AREA AND LINEAR AIRWAY CHANGES AFTER ORTHOGNATHIC SURGERY: A PRELIMINARY STUDY
Purpose: The aim of this study was to retrospectively evaluate volumetric, cross sectional surface area, and linear airway changes in healthy patients undergoing orthognathic surgery.
Materials and methods: Ten patients were included in the study. The first group included five patients that had maxillary and mandibular advancements (MMA) with genioplasty. The second group included five patients who underwent maxillary advancement with mandibular setback (MAMS). The changes in airway volume, surface area and linear values from defined hard and soft tissue parameters were evaluated using pre- and post-operative cone-beam computed tomography (CBCT). A paired t-test was used to explore statistical significance.
Results: A statistically significant increase of the airway volume (34.3%) was noted in the MMA group. The changes in the MAMS group were not found to be statistically significant, although an average volumetric decrease of 8.8% was noted in this group. The minimal axial surface area measurements in the MMA at the level of the soft palate and tongue significantly increased (56.8% and 44.9% respectively). MAMS did not produce significant changes at these levels (11.2% and 9.1% decrease respectively). Linear changes revealed statistically significant increase of the airway in the MMA group, whereas same measurements failed to produce significant changes in the MAMS group.Conclusion: Without significant changes in the measured parameters, surgeons can have greater confidence that MAMS is not altering the airway in a negative way.
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