This is a cadaveric study comparing alterations in airway volume. Seven advancements of the maxillomandibular complex were undertaken, each with a 2 mm incremental advancement being scanned with a total of eight scans per cadaver. They showed that comparisons between maxillomandibular advancement indicated significantly greater alteration in airway volume at 6-8 mm of advancement in comparison to 8-10, 10-12 or 12-14. As it is known, such surgery is extremely effective for the treatment of obstructive sleep apnoea. The authors advocate that the 6-8 mm advancement can still achieve a therapeutic effect in managing sleep apnoea while minimising the risk of negative facial aesthetic outcomes associated with advancements exceeding 10mm. Whilst such an advancement is effectively a face lift in reverse, and therefore tends to have a very pleasing aesthetic result, this may allay some of the preoperative patient fears of changes to the facial profile whilst still improving apnoea.