Methods: fifty-two lateral cephalograms of 26 patients who underwent maxillary advancement surgery with a Le Fort I osteotomy without adjunctive impaction were studied before and after minimum 6 months after orthognatic surgery. The range of maxillary advancement was from 2 to 9 millimetres, measured at the upper incisors. Nasolabial angle, lip length, collumella convexity, lower dorsum convexity, nasal length, nasal depth, dorsal hump and nasal tip changes were measured in each patient, before and after maxillary advancement.
Results: nasolabial angle, lip length and lower dorsum convexity revealed significant increas after maxillary advancement (p<0.05). While collumella convexity, nasal depth, nasomental angle and dorsal hump significantly decreased. Nasal tip was moved forward and upward after surgery. There was no difference in nasal length before and after maxillary advancement.
Conclusions: the results showed that maxillary advancement surgery can affect nasal profile significantly by influencing nasolabial and nasomental angles, dorsal hump, nasal depth and nasal tip.