Influence of cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with 2- and 4-premolar extraction protocols - Janson, Guilherme dos Reis Pereira; Janson, Marcos; Nakamura, Alexandre; Freitas, Marcos Roberto de; Henriques, José Fernando Castanha; Pinzan, Arnaldo (American Journal of Orthodontics and Dentofacial Orthopedics, 2008)