@article{almeida_elias_2020,  title={Influence of heat treatment on color and flexibility of nickel-titanium endodontic instruments},  volume={68},  ISSN={1981-8637},  url={https://doi.org/10.1590/1981-86372020000443683},  DOI={10.1590/1981-86372020000443683},  journal={RGO - Revista Gaúcha de Odontologia},  publisher={Faculdade São Leopoldo Mandic},  author={ALMEIDA, Bernardo Corrêa de and ELIAS, Carlos Nelson},  year={2020},  pages={e20200044} }