Comparative cephalometric study of Class II division 1 malocclusion between Lithuanian and Jordanian females.

The Class II malocclusions have a strong hereditary component as etiologic factor, both in families and in ethnic and racial groups. The purpose of this study to compare skeletal and dentoalveolar morphology in Class II division I malocclusion of Lithuanian and Jordanian females. The sample consisted of 60 standardized lateral cephalograms (30 Jordanian - 30 Lithuanian). The mean age of the subjects was 14.8+/-1.11 years. Criteria for cephalometric comparison were 5 linear and 10 angular cephalometric variables. Repeating landmark identification tested reproducibility of the measurements. Unpaired t-test was performed to assess the difference of malocclusion between both groups. Results considered to be statistically significant when p<or=0.05. Results showed that Lithuanian females had reduced vertical skeletal relationship in their Class II division 1 malocclusion, while Jordanian females characterized by increased vertical relationship. Dentoalveolar measurements showed a significant proclination of the mandibular incisors in Jordanian females compared with Lithuanians.