Prevalence of microorganisms in root canals of human deciduos teeth with necrotic pulp and chronic periapical lesions - Pazelli, Luciana Cunha; Freitas, Aldevina Campos de; Ito, Izabel Yoko; Souza-Gugelmin, Maria Cristina Monteiro de; Medeiros, Alexandra Sárzyla; Nelson Filho, Paulo (Pesquisa Odontológica Brasileira, 2003)