6PAZELLI L C, FREITAS A C, ITO I Y, et al. Prevalence of microorganisms in root canals of human deciduous teeth with necrotic pulp and chronic periapical lesions[J]. Pesqui Odontol Bras, 2003,17(4):367-371.
7Figdor D, Sundqvist G. A big role of the very small-understanding the endodontic microbial flora [ J]. Aust Dent J, 2007,52( 1 Snppl) :S38 - S51.
8Costerton JW, Stewart PS, Greenberg EP. Bacterial biofilms: A common cause of persistent infections [ J]. Science, 1999, 284(5418) :1318 - 1322.
9Nair PN, Henry S, Cano V, et al. Microbial status of apical root canal system of human mandibular first molar with primary apical periodontitis after 'one-visit'endodontic treatment [ J]. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2005,99 ( 2 ) :231 - 252.
10Gomes BP, Pinheiro ET, Gade-Neto CR, et al. Microbiological examination of infected dental root canals [ J ]. Oral Microbiol Immunol, 2004,19 ( 2 ) : 71 - 76.
