Inclusion criteria
malocclusion, retrognathic mandible, overjet

Skeletal Class II malocclusion with retrognathic mandible (ANB > 5°, SNB < 76°)Regular growth pattern (SN/MP angle was in 25–35° range)Unilateral or bilateral Class II molar relationship greater than or equal to one-half a cusp width.Minimal or no crowding in the mandibular arch (0–5 mm)An average inclination or slight retroclination of the lower incisorAn overjet greater than 5 mm.