Treatment for the elimination of gengival metanin pigmentation: acellular dermal matrix allograft versus gingivoplasty - Felipe, M. E. C.; Andrade, P. F.; Novaes Júnior, Arthur Belém; Grisi, Márcio Fernando de Moraes; Souza, Sérgio Luis Scombatti de (International Biennial Congress of The International Academy of Periodontology, 2005)