关键词: X线头影测量, McNamara 分析法, 青少年, 正常　

Abstract:

The purpose of this study was to obtain the normal value of McNamara analysis for Chengdu adolescents with nor2 mal occlusion of early permanent dentition.Methods : McNamara analysis was conducted on the basis of the lateral cephalograms of 67 Chengdu adolescents with normal occlusions , and the obtained data was compared with that of Shanghai adolescents and Mc2 Namara. Results : There was no difference in the normal values of McNamara analysis between male and female Chengdu adoles2 cents. The Comparative results between Chengdu and Shanghai adolescents indicated significantly larger values of Shanghai adoles2 cents in effective middle facial lengths , mandibular lengths and lower anterior facial heights. The vertical distances from the upper incisor to point A and , from the lower incisor to A- Po line of Chengdu adolescents were larger than those of white adolescents. Conclusion : There is significantly difference in values of normal occlusions of McNamara analysis among different regions and dif2 ferent races.

Key words: cephalmetrics, McNamara analysis, adolescent, normal occlusion