[Genioplasty with two-step osteotomy for severe microgenia].

Objective: To investigate a technique for correction of severe microgenia.

Methods: The mandibular symphysis was exposed through intraoral mucous incision. Two parallel osteotomies were performed under mental foramen. The mobilized segments were advanced like two steps and fixed rigidly with miniplate.

Results: From June, 2004 to Dec, 2005, 10 cases with severe microgenia were treated with this technique. The duration of follow-up was six months. The mean chin advancement was 1.1 cm and the mean chin vertical increase was 0.7 cm. All the patients healed very well with satisfactory aesthetic result.

Conclusions: With this two-step genioplasty, the chin can be moved to ideal position with a natural appearance. It is a reliable method for severe microgenia.