ABSTRACT
Background:Class II division 1 characterized by class II angle classification with retroclination of upper central incisors and lateral incisors. According to some studies this type of malocclusion represents 5-10% of malocclusion. Methods:The sample included 40 cephalometric radiographs of Yemeni subjects (20 males and 20 females) with age range between12-18 years old collected randomly and traced by hand in the dark room on the acetate papers with 0.5 pencil. Results: The statistical analysis showed a highly significant difference between males and females (P<0.01) in A-B Plane and Z Angles. Conclusion: More retrusive mandible in females than males, and presence of differences in the size of chin and soft tissue thickness between Yemeni males and females