Influence of the preparation order in four-canal maxillary molars with waveone gold system - Alberton, Carlla Sloane; Tomazinho, Flávia Sens Fagundes; Calefi, Pedro Henrique Souza; Duarte, Marco Antonio Hungaro; Vivan, Rodrigo Ricci; Baratto Filho, Flares (Journal of Endodontics, 2020)