Abstract
The purpose of this study is to develop cephalometric standards for Iraqi adolescents in Mosul City, using Downs' analysis, and to compare them with those of white Americans. The lateral cephalometric radiographs (108) Iraqi adolescents (57 males and 51 females) with age range was (12) to (15) years (with a mean of 13.7 years) were carried out. The subjects were chosen on the bases of having class I normal occlusion and well-balanced faces. Measurements were taken for all dento-skeletal variables in Downs' analysis. Norms were established for the Iraqi sample and the comparison between both sexes was carried out. No significant difference was demonstrated between males and Females. When the measurements of this study were compared with Downs' original data for white Americans, the Iraqi adolescents showed a highly significant greater values of facial convexity angle, mandibular plane angle, Y-axis angle, occlusal plane angle, lower incisors inclination to the occlusal plane and to the mandibular plane and the distance of upper incisors to Apog line. The interincisal angle and facial angle were significantly higher in Downs' original standards than the present study
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