Use of acellular dermal matrix allograft in the elimination of gingival melanin pigmentation: a comparative clinical study with 12 months of follow-up - Souza, Sérgio Luis Scombatti de; Pontes, Ana Emília Farias; Pontes, Carla Cruvinel; Novaes Júnior, Arthur Belém; Taba Júnior, Mário; Grisi, Márcio Fernando de Moraes (International Biennial Congress of The International Academy of Peridontology, 2005)