Shaping ability of rotary or reciprocating systems for oval root canal preparation: a micro-computed tomography study - Espir, Camila Galletti; Nascimento-Mendes, Camila Almeida; Guerreiro-Tanomaru, Juliane Maria; Cavenago, Bruno Cavalini; Duarte, Marco Antonio Hungaro; Tanomaru-Filho, Mário (Clinical Oral Investigations, 2018)