@article{ribeiro_henckel_mello_felippe_felippe_2019,  title={Radiographic analysis the obturation’s quality in root canal treatment performed by a South Brazilian sample of undergraduate students},  volume={67},  ISSN={1981-8637},  url={https://doi.org/10.1590/1981-863720190004020180038},  DOI={10.1590/1981-863720190004020180038},  journal={RGO - Revista Gaúcha de Odontologia},  publisher={Faculdade São Leopoldo Mandic},  author={RIBEIRO, Dayane Machado and HENCKEL, Marcela Daniela and MELLO, Fernanda Weber and FELIPPE, Mara Cristina Santos and FELIPPE, Wilson Tadeu},  year={2019},  pages={e20190040} }