Two Cases of Distraction Osteogenesis in Lengthening Hypoplastic Mandible of Hemifacial Microsomia. Evaluation 3 Years after Distraction.

Mandibular lengthening by distraction osteogenesis was performed on two females (6 and 9 years old) with hemifacial microsomia to correct facial asymmetry. The follow up was done by cephalometric analysis for 3 years.The results were as follows:1) Three years after distraction, the morphological symmetry corrected by distraction had almost been maintained.2) However, a slight amount of deviation on affected side was noticed at the Menton.3) In lateral chepharogram, ∠SN-Pog did not changed for 3 years after distraction.4) Downward growth of the maxilla on the affected side was not observed. Open bite at lengthened side seemed to be closed by eruption of the permanent molars.