1Clark WJ. The twin block technique. A functional orthopedic app li2ance system[J]. Am J Orthod Dentofaeial Orthop,1988,93( 1 ) :1.
2Arnett GW, Bergman RT. Facial keys to orthodontic diagnosis andtreatment planning. Part 1[J]. Am J Orthod Dentofaeial Orthop, 1993,103 (4) :299.
3Singh GD, Clark WJ. Localization ofmandibular changes in patientswith class Ⅱ division 1 malocclusions treated with twin2block app li2ances: finite element scaling analysis [ J ]. Am J Orthod DentofacialOrthop, 2001,119(4) :419.
4Singh GD, ClarkWJ. Soft tissue changes in patientswith Class Ⅱ- Di2vision 1 malocclusions treated using Twin Block appliances: finite2element scaling analysis[J]. Eur J Orthod ,2003,25 ( 3 ) :225.
5MorrisDO, Illing HM, Lee RT. A prospective evaluation of Bass, Bionator and Twin block app lianees. Part Ⅱ 2 the soft tissues [J]. Eur J Orthod, 1998,20 (6) :663.
6McDonagh S, Moss JP, Goodwin P, et al. A prospective op tical sur2face scanning and cephalometric assessment of the effect of function2al appliances on the soft tissues [ J ]. Eur J Orthod, 2001,23 (2) :115.
7Singh GD. Morphospatial analysis of soft2tissue profile in patientswith Class Ⅱ Division 1 malocclusion treated using Twin block ap2pliances : geometric morphometrics[ J]. Orthod Craniofac Res ,2002,5 ( 1 ) :38.
8Singh GD. Morphos patial analysis of s oft2tissue p r ofile in patients- with Class Ⅱ Division 1 real occlusion treated using Twin block ap2p liances : geometric morphometrics [ J ]. Orthod Craniofac Res, 2002,5 (1) :38.
9Arnett GW, Gunson MJ. Facial p lanning for orthodontists and oralsurgeons[J]. Am J Orthod Dentofacial Orthop,2004,126(3):290.
10Bravo LA, Canut JA, Pascual A, et al. Br J Orthod, 1997,24(1) :25 - 34.
