@article{ribeiro_lula_azevedo_maia_lopes_2012,  title={Salivary retention after application of fluoride gel using toothbrush or tray: a crossover trial},  volume={26},  ISSN={1806-8324},  url={https://doi.org/10.1590/S1806-83242012000600002},  DOI={10.1590/S1806-83242012000600002},  number={6},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={Ribeiro, Cecilia Claudia Costa and Lula, Estevam Carlos de Oliveira and Azevedo, Izabelle Maria Cabral de and Maia, Mariana de Figueiredo Lopes e and Lopes, Fernanda Ferreira},  year={2012},  month={Nov},  pages={493–497} }