Cephalometric evaluation of craniofacial features of class II division 1 malocclusion in patients 11-14 years old refered to Mashhad dental school during 1996-2002

The prevalence of class II malocclusion is reported 1. 7٪ to 63٪ in the orthodontic literature. It has been pointed out by many investigators that a dental class II division 1 malocclusion occurs in a variety of skeletal and dental configurations. The purpose of this study is identification of the craniofacial features of patients with class II division 1 malocclusion. Methods & Materials: In this descriptive study lateral cephalograms of 63 samples with normal occlusion as control group and 41 samples with class II division 1 malocclusion as case group between the ages of 11 to 14 years were selected according to Angle`s criteria. Then craniofacial features of case and control groups were compared by paired t test. Since there were no significant differences between the boys and girls in any groups, the total results of case and control groups compared. Results indicate that except maxillary skeletal position, lower incisor position and vertical dentofacial components, all of the selected linear and angular measurments showed significant differences between the class II division 1 malocclusion and with normal occlusion. The findings of this study suggest a difinite skeletal and dentoalveolar pattern with the following characteristics for class II division 1 malocclusion: 1) Orthognathic maxilla, 2) Retrognathic mandible 3) Class II intermaxillary relationship 4) Upper incisors are proclined and lower incisors are in normal position, 5) Vertical components are similar to samples with normal occlusion.