1Negro MM. Effect of intracanal use of nonsteroidal antiinflammatory agents on posttreatment endodontic paine [J]. Oral Surg Oral Med Oral Pathol, 1994, 77 (5) :507-513.
3Costerton JW, Stewart PS, Greenberg EP. Bacterial biofilms: a common cause of persistent infections [J]. Science, 1999, 284(5418)∶1 318-1 322.
4Noiri Y, Ehara A, Kawahara T, et al. Participation of bacterial biofilms in refractory and chronic periapical periodontitis [J]. J Endon, 2002, 28(10)∶679-683.
5Leonardo MR, Rossi MA, Silva LAB, et al. EM evaluation of bacterial biofilm and microorganisms on the apical external root surface of human teeth [J]. J Endon, 2002, 28(12)∶815-818.
6Molven O, Olsen I, Kerekes K. Scanning electron microscopic observations of apical part of root canals in permanent teeth with periapical lesions [J]. Endod Dent Traumatol, 1991,7∶226-229.
7Lomcali G, Sen BH, Cankaya H. Scanning electron microscopic observations of apical root surfaces of teeth with apical periodontitis [J]. Endod Dent Traumatol, 1996, 12(2)∶70-76.
8Tronstad L, Barnett F, Cervone F. Periapical bacterial plaque in teeth refractory to endodontic treatment [J]. Endod Dent Traumatol, 1990, 6(2)∶73-77.
9Yare GM, Bou Dagher BF. Sealing ability of the verical condensation with different root canal sealers [J]. J Endodontics, 1996,22(1):6.