A randomized comparative study of two techniques to optimize the root coverage using a porcine collagen matrix - Reino, Danilo Maeda; Maia, Luciana Prado; Fernandes, Patrícia Garani; Souza, Sérgio Luis Scombatti de; Taba Júnior, Mário; Palioto, Daniela Bazan; Grisi, Márcio Fernando de Moraes; Novaes Júnior, Arthur Belém (Brazilian Dental Journal, 2015)