Effect of sodium ascorbate and ascorbic acid hydrogels on microleakage of composite restorations after an offi ce bleaching protocol - Sgura, Ricardo; Taddeo, Fernando; Moura, Natallia Coelho de; Tapety, Celiane Mary Carneiro; Rodrigues Júnior, Ezequias Costa; Medeiros, Igor Studart (Clinical and Laboratorial Research in Dentistry, 2013)