The pre-treatment lateral cephalograms of two groups of 20 subjects with severe Class III malocclusions were compared. One group had been considered suitable for orthodontic correction by the diagnosing clinician and the other offered orthognathic surgery. The most significant differences between the groups were in angle ANB, M/M ratio (P < 0·001), lower incisor inclination and Holdaway angle (P < 0·01). Threshold values for angle ANB and lower incisor angulation below which surgery was almost always carried out were—4 and 83 degrees, respectively.
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