Biofilm formation in Haas palatal expanders with and without use of an antimicrobial agent: an in situ study - Bagatin, Cristhiane Ristum; Andrucioli, Marcela Cristina Damião; Ferreira, José Tarcisio Lima; Matsumoto, Mirian Aiko Nakane; Silva, Raquel Assed Bezerra da; Silva, Léa Assed Bezerra da; Romano, Fábio Lourenço; Nelson Filho, Paulo (Microscopy Research and Technique, 2017)