Objective:To describe the dental form and basal bone arch form of skeletal ClassⅡ malocclusion patients by transforming 3 Dimage data to 2 Dplane and establishing a mathematical model.Methods:CBCT data of 30 patients with skeletal ClassⅡ malocclusion were selected.Occlusion plane with mathematical algorithm by dental form point(Fa)and basal bone arch form point(Ba)was determined.3 Dimage data was transformed to 2 Dplane with Software Matlab 7.0.Results:The mathematical model describing the dental arch and b...