Altered active and passive eruption: a modified classification - Zangrando, Mariana Schützer Ragghianti; Veronesi, Giovana F.; Cardoso, Matheus V.; Michel, Raphaella C.; Damante, Carla Andreotti; Sant’Ana, Adriana Campos Passanezi; Rezende, Maria Lúcia Rubo de; Greghi, Sebastião Luiz Aguiar (Clinical Advances in Periodontics, 2015)