A radiographic comparasion of apical root resorption after orthodontic treatment with 3 different fixed appliance techniques - Janson, Guilherme dos Reis Pereira; Canto, Graziela de Luca; Martins, Décio Rodrigues; Henriques, José Fernando Castanha; Freitas, Marcos Roberto de (American Journal of Orthodontics and Dentofacial Orthopedics, 2000)