a1 Department of Maxillofacial Surgery, Ullevål University Hospital
a2 Department of Orthodonties, University of Oslo, Oslo, Norway
a3 Department of Otorhinolaryngology, Ullevål University Hospital
Facial skeletal morphology was studied by cephalometric analysis in 25 patients with obstructive sleep apnoea syndrome (OSAS) and ten controls. The hyoid bone was more inferiorly positioned in patients (at the level of cervical vertebrae C4-C6) than in controls (C3-C4 level). The height and length of the nasal cavity was normal, while the length of the bony nasopharynx was moderately reduced. The mandibular plane inclination was slightly larger in patients as was the anterior face height. Mandibular retrognathia was demonstrated in six patients (24 per cent), but the angles of maxillary and mandibular prognathism was within normal limits when the group was considered as a unity. Cephalometric analysis is highly recommended as a diagnostic aid in OSAS patients, especially when surgical intervention is considered.
c1 Dr Torstein Lyberg, Department of Maxillofacial Surgery, Ullevål University Hospital, 0407 Oslo 4, Norway.