Poliana Mendes Duarte1, André Figueiredo Reis2. 1. Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos, São Paulo, Brazil. Electronic address: pduarte@ung.br. 2. Department of Operative Dentistry, Dental Research Division, Guarulhos University, Guarulhos, São Paulo, Brazil. Electronic address: areis@prof.ung.br.