@article{ourique_arrais_cassoni_ota-tsuzuki_rodrigues_2011,  title={Effects of different concentrations of carbamide peroxide and bleaching periods on the roughness of dental ceramics},  volume={25},  ISSN={1806-8324},  url={https://doi.org/10.1590/S1806-83242011000500013},  DOI={10.1590/S1806-83242011000500013},  number={5},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={Ourique, Sérgio Augusto Morey and Arrais, César Augusto Galvão and Cassoni, Alessandra and Ota-Tsuzuki, Cláudia and Rodrigues, José Augusto},  year={2011},  month={Sep},  pages={453–458} }