Effectiveness of the protaper next and reciproc systems in removing root canal filling material with sonic or ultrasonic irrigation: a micro–computed tomographic study - Martins, Milena Perraro; Duarte, Marco Antonio Hungaro; Cavenago, Bruno Cavalini; Kato, Augusto Shoji; Bueno, Carlos Eduardo da Silveira (Journal of Endodontics, 2017)