Replacement of hopeless retained primary teeth by immediate dental implants: a case report - Oliveira, Rafael R. de; Macedo, Guilherme O.; Muglia, Valdir Antônio; Souza, Sérgio Luis Scombatti de; Novaes Júnior, Arthur Belém; Taba Júnior, Mário (International Journal of Oral and Maxillofacial Implants, 2009)