This is a systematic review of meta-analysis evaluating the effect of different types of orthognathic surgery on the cross sectional area and volume of the upper airway as assessed using CT or MRI. They found 28 articles of which only eight were thought to have a low risk of bias. They noted that there was no evidence to confirm that changes in the upper airway dimensions after orthognathic surgery predispose it to obstructive sleep apnoea. The aim of the review was to assess changes of the airway dimensions rather than initial final values. Overall they concluded that there was moderate evidence to unveil that the minimum cross sectional area of the upper airway increases significantly as does the total volume. There was a significant reduction in total volume after a maxillary advancement and mandibular setback as well as mandibular setback in isolation. This was based upon 3D imaging.
Changes in airway dimensions after orthognathic surgery
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