@article{article7be99735,
title   = {Crown-down preflaring in the determination of the first apical file},
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},
doi = {10.1590/S1806-83242010000200005},
journal   = {Brazilian Oral Research}
}