Comparative accuracy of the Clearing Technique, CBCT and Micro-CT methods in studying the mesial root canal configuration of mandibular first molars - Ordinola-Zapata, Ronald; Bramante, Clovis Monteiro; Versiani, Marco Aurélio; Moldauer, Bertram Ivan; Topham, G.; Gutmann, J. L.; Nuñez, A.; Duarte, Marco Antonio Hungaro; Abella, F. (International Endodontic Journal, 2017)