Comparison of two surgical procedures for use of the acellular dermal matrix graft in the treatment of gingival recessions: a randomized controlled clinical study - Felipe, Maria Emília M. C.; Andrade, Patrícia F.; Grisi, Márcio Fernando de Moraes; Souza, Sérgio Luis Scombatti de; Taba Júnior, Mário; Palioto, Daniela Bazan; Novaes Júnior, Arthur Belém (Journal of Periodontology, 2007)