6Macdonald KE, Kapnst AJ, Turley PK. Cephalometric changes after the correction of class 111 malocclusionwith maxillary expansion/facemask therapy[J]. Am J Or- thod Dentofacial Orthop, 1999, 116(1):13-24.
7Gallagher RW, Miranda F, Buschang PI-I. Maxillary pro- traction: Treatment and posttreatment effects[J]. Am J Orthod Dentofacial Orthop, 1998, 113 (6) :612-619.
8Smith SW, English JD. Orthodontic correction of a class BI malocclusion in an adolescent patient with a bonded RPE and protraction face mask[J]. Am J Orthod Dento- facial Orthop, 1999, 116(2):177-183.
9Cameron CG, Franchi L Baccetti T, et al. Long-term ef- fects of rapid maxillary expansion: A posteroanterior ce- phalometric evaluation[J]. Am J Orthod Dentofacial Or- thop, 2002, 121 (2) : 129-135.
10Litton SF, Ackermann LV, Isaacson R J, et al. A genetic study of Class 3 malocclusion[J]. Am J Orthod, 1970, 58 (6) : 565-577.
9Shanker S,Ngan P,Wade D,et al.Cephalometric A point changes during and after maxillary protraction and expansion[J].Am J Orthod Dentofacial Orthop,1996,110(4):423-430.
10Vaughn GA,Mason B,Moon HB,et al.The effects of maxillary protraction therapy with or without rapid palatal expansiona:a prospective,randomized clinical trial[J].Am J Orthod Dentofacial Orthop,2005,128(3):299-309.