Cephalometric study of adolescents with normal occlusion in Changzhou city(one)

Objective To establish the standard values of roentgengraphic cephalometry in adolescents with normal occlusion in Changzhou city.Methods 120 Han ethnic subjects evaluated in the study with normal occlusion,were selected to take lateral cephalograph.Linear and angular measurements were calculated.Cephalometrics parameters were analyzed,based on application of classic methods.Data were obtained for test between the groups.Results The norms with derivation for all measurements of X-ray cephalometrical analysis on hard tissues were established.The comparison was made according to different districts.The mandibular plane angle(MPA),as well as Y-axis were larger than those of Xi'an and Changchun adolescents.The to manddibular plane was smaller than that of Beijing and Xi'an adolescents.Conclusion Differences exist between districts.