6Burstone CJ. Soft-tissue profile-fallacies of hard-tissue standards in treatment planning[J]. Am J Orthod,1986,90 (1):52-56.
7Reed A Holdaway. A soft-tissue cephalometric analysis and its ues in orthodontic treatment planning[J]. Am J Orthod,1983,84(2):1-28.
8LITTR A,NIELSEN I L.Class Ⅱ,division 2 malocclusion.To extract-or not[J].Angle Orthod,1984,54(2):123-138.
9Mills JRE. The problem of overbite in Class Ⅱ division 2 malocclusion [J]. Br J Orthod, 1973, 1 (1):34-48.
10Ingervall B, Lennartson B. Cranial morphology and dental arch dimensions in children with Angle Class Ⅱ division 2 malocclusion [J]. Odontol Revy, 1973, 24 (2): 149-160.