External root resorption with the self-ligating Damon system: a retrospective study - Handem, Roberta Heiffig; Janson, Guilherme; Matias, Murilo; Freitas, Karina Maria Salvatore de; Lima, Darwin Vaz de; Garib, Daniela Gamba; Freitas, Marcos Roberto de (Progress in Orthodontics, 2016)