SEM analysis of enamel surface treated by Er:YAG laser: influence of irradiation distance - Souza-Gabriel, A. E.; Chinelatti, Michelle Alexandra; Borsatto, Maria Cristina; Pécora, Jesus Djalma; Palma-Dibb, Regina Guenka; Corona, Silmara Aparecida Milori (Microscopy Research and Technique, 2008)