Radiopacity and cytotoxicity of Portland cement associated with niobium oxide micro and nanoparticles . Journal of Applied Oral Science, [S. l.], v. 22, n. 6, p. 554–559, 2014. DOI: 10.1590/1678-775720140209. Disponível em: https://www.revistas.usp.br/jaos/article/view/100920.. Acesso em: 5 may. 2024.