Potential tooth staining due to root canal sealers containing bismuth oxide and formaldehyde - Marciano, Marina Angélica; Camilleri, Josette; Mondelli, Rafael Francisco Lia; Amoroso, Pablo Andres; Cavenago, Bruno Cavalini; Perochena, Aldo del Carpio; Duarte, Marco Antonio Hungaro (ENDO - Endodontic Practice Today, 2015)