ABSTRACT
To determine the posteroanterior cephalometric norms in Palestinian adults, and to compare the Palestinian norms with the norms of other ethnic groups. PA cephalometric radiographs for 70 Palestinian adults aged between 17-23 years were selected on the basis of Class I molar relationship, good facial symmetry, and no history of previous orthodontic treatment. Fourteen transverse linear measurements, including 10 skeletal measurements and 4 dental measurements, were determined on each radiograph. Dentofacial transverse dimensions in Palestinian adults were generally similar to Rocky crease in Palestinian men compared to women except for the inter-orbital distance. Regarding dental transverse measurements, both maxillary and mandibular inter-molar widths increased were nearly similar in both genders. These posteroanterior cephalometric norms are recommended to be used when formulating a treatment plan for this particular ethnic group