9Miller R J, Duong TT, Derakhshan M. Lower incisor extrac- tion treatment with the Invisalign system [J]. J Clin Or- thod,2002,36(2) :95-102.
10Choi NC,Park YC,Jo YM,et al. Combined use of minis- crews and clear appliances for the treatment of bialveolar protrusion without conventional brackets[J]. Am J Orthod Dentofacial Orthop, 2009,135 ( 5 ) : 671-681.