@article{silveira_silveira_castro_césar neto_martos_2010,  title={Crown-down preflaring in the determination of the first apical file},  volume={24},  ISSN={1806-8324},  url={https://doi.org/10.1590/S1806-83242010000200005},  DOI={10.1590/S1806-83242010000200005},  number={2},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={Silveira, Luiz Fernando Machado and Silveira, Carina Folgearini and Castro, Luis Antônio Suita de and César Neto, João Batista and Martos, Josué},  year={2010},  month={Apr},  pages={153–157} }