Extended genioplasty: long-term cephalometric, morphometric and sensory results.

The incision, dissection, osteotomy design and fixation are important technical considerations when performing a genioplasty. The purpose of this study was to describe an extended genioplasty technique and to evaluate stability of position, form, surface area of the chin and incidence of postoperative sensory deficit. Records of 15 consecutive adult patients who underwent the extended genioplasty procedure were reviewed. The technique included incision in the labial vestibule from 2nd premolar to 2nd premolar, dissection, mobilization and retraction of the mental nerves, osteotomy parallel to the occlusal plane extending proximally to the antegonial notch and rigid fixation. Lateral cephalograms pre- and postoperatively and at the latest follow-up (> 6 months) were analyzed by linear and computer morphometric measurements to evaluate changes in position, shape and surface area of the chin. Neurosensory data from examination or questionnaire were recorded. Immediately postoperatively (T1), mean advancement in the sagittal plane was +8.7 mm and increase in surface area was +1.1 cm2. At the end of follow-up (T2), there were no significant changes (T2-T1) in chin position or surface area. Inferior border form was rated as smooth in all cases. Neurosensory evaluation revealed that 12/12 patients evaluated had functional sensory return at T2.