Effect of different bleaching systems on the ultrastructure of bovine dentin - Carrasco-Guerisoli, Laise Daniela; Schiavoni, Renato Jonas dos Santos; Barroso, Juliana Machado; Guerisoli, Danilo Mathias Zanello; Pécora, Jesus Djalma; Froner, Izabel Cristina (Dental Traumatology, 2009)