Construction of a copper stepwedge with aluminum equivalent mean gray values . Journal of Applied Oral Science, [S. l.], v. 18, n. 4, p. 390–396, 2010. DOI: 10.1590/S1678-77572010000400012. Disponível em: https://www.revistas.usp.br/jaos/article/view/3814.. Acesso em: 21 may. 2024.