@article{ferreira_sapata_provenzano_hayacibara_ramos_2019,  title={Periodontal parameters of two types of 3 x 3 orthodontic retainer: a longitudinal study},  volume={24},  ISSN={2176-9451},  url={https://doi.org/10.1590/2177-6709.24.3.064-070.oar},  DOI={10.1590/2177-6709.24.3.064-070.oar},  number={3},  journal={Dental Press Journal of Orthodontics},  publisher={Dental Press International},  author={Ferreira, Larissa A. and Sapata, Diogo M. and Provenzano, Maria G. A. and Hayacibara, Roberto M. and Ramos, Adilson L.},  year={2019},  month={May},  pages={64–70} }