Qualitative Analysis of the Removal of the Smear Layer in the Apical Third of Curved Roots: Conventional Irrigation versus Activation Systems - Blank-Gonçalves, Luciana Magrin; Nabeshima, Cleber Keiti; Martins, Guilherme Henrique Rosa; Machado, Manoel Eduardo de Lima (Journal of Endodontics, 2011)