@article{magalhães_freitas_moreira_ferreira_2009,  title={Validity of staining and marginal ditching as criteria for diagnosis of secondary caries around occlusal amalgam restorations: an in vitro study},  volume={20},  ISSN={0103-6440},  url={https://doi.org/10.1590/S0103-64402009000400008},  DOI={10.1590/S0103-64402009000400008},  number={4},  journal={Brazilian Dental Journal},  publisher={Fundação Odontológica de Ribeirão Preto},  author={Magalhães, Claudia Silami and Freitas, Amanda Beatriz Dahdah Aniceto de and Moreira, Allyson Nogueira and Ferreira, Efigênia Ferreira},  year={2009},  pages={307–313} }