Four-step mandibular lengthening to correct a bird face deformity. A case report.

A technique for extreme lengthening of the mandible is presented. In one operation it combines several procedures already known, modifying some of them. Its advantage is that the movement is subdivided in 4 steps. Thereby the need for grafting is reduced or even absent and the amount of relapse is probably less important than if fewer but bigger movements were applied.