@article{michelon_frighetto_lang_bello_pillar_serpa_bier_2016,  title={Efficacy of passive ultrasonic irrigation in removing root filling material during endodontic retreatment},  volume={45},  ISSN={1807-2577},  url={https://doi.org/10.1590/1807-2577.02814},  DOI={10.1590/1807-2577.02814},  number={1},  journal={Revista de Odontologia da UNESP},  publisher={Universidade Estadual Paulista Júlio de Mesquita Filho},  author={MICHELON, Carina and FRIGHETTO, Marina and LANG, Pauline Mastella and BELLO, Mariana De Carlo and PILLAR, Rafael and SERPA, Geraldo Fagundes and BIER, Carlos Alexandre Souza},  year={2016},  month={Jan},  pages={15–20} }