6Drosehl H. The bionator in interceptive treatment-indi- cations and limits[J]. ZWR, 1984, 93(10):789-792.
7Tulloeh JF, Medland W, Tuncay OC. Methods used to evaluate growth modification in class II malocclusion[J]. Am J Orthod Dentofacial Orthop, 1990, 98(4):340-347.
8Casutt C, Pancherz H, Gawora M, et al. Success rate and eglciency of activator treatment[J]. Eur J Orthod, 2007, 29 (6) :614-621.
9Bendeus M, Rabie B, Hagg U. Growth and treatment changes in patients treated with a headgear-activator appliance[J]. Am J Orthod Dentofacial Orthop, 2002, 121 (4) : 376-384.
10Bondevik O. Treatment needs following activator-head- gear therapy[J]. Angle Orthod, 1995, 65(6):417-422.
