<prompt>  In patients with facial disproportion producing malocclusionan osteotomy alone in the mandibular ramus can be used to close an anterior open bite.a sagittal split osteotomy commonly produces inferior dental nerve paraesthesiaan intra oral vertical sub sigmoid osteotomy is appropriate for treating mandibular retrognathia.following a down fracture of the maxilla at Le Fort I level the blood supply to the alveolus relies only on the integrity of the greater palatine artery 