Effect of time and ultrasonic activation on ethylenediaminetetraacetic acid on smear layer removal of the root canal - Castro, Fábio Pereira Linhares de; Pinheiro, Sérgio Luiz; Duarte, Marco Antonio Hungaro; Duque, Jussaro Alves; Fernandes, Samuel Lucas; Anchieta, Rodolfo Bruniera; Bueno, Carlos Eduardo da Silveira (Microscopy Research and Technique, 2016)