References
1. Kakehashi S, Stanley HR, Fitzgerald RJ. The effects of surgical exposures of dental pulps in germ-free and conventional laboratory rats. Oral Surg 1965. 20340–349.
2. Brook I, Frazier EH, Gher ME. Aerobic and anaerobic microbiology of periapical abscess. Oral Microbiol Immunol 1991. 6123–125.
3. Zavistoski J, Dzink J, Onderdonk A, Bartlett J. Quantitative bacteriology of endodontic infections. Oral Surg 1980. 49171–174.
4. Winkelhoff V, Steenbergen TJM, Graaff J. The role of black-pigmented Bacteroides in human oral infections. J Clin Periodontol 1998. 15145–155.
5. Winkelhoff AJ, Steenbergen TJM, Kippuw N, Graaff J. Further characterization of Bacteroides endodontalis, an asaccarolytic black-pigmented bacteroides species from the oral S Cavity. J Clin Microbiol 1985. 2275–79.
6. Oliveira JCM, Siqueira JF, Alves GB, Hirata R, Andrade AFB. Detection of Porphyromonas endodontalis in infected root canals by 16S rRNA gene-directed polymerase chain reaction. J Endod 2000. 26729–732.
7. Hofstad T. Pathogenicity of anaerobic gram-negative rods: possible mechanisms. Rev Infect Dis 1984. 6189–199.
8. Lamont RJ, Jenkinson HF. Life below the gum line: pathogenic mechanisms of Porphyromonas gingivalis. Microbiol Mol Biol Rev 1998. 621244–1257.
9. Shah HN, Collis MD. Proposal for reclassification of Bacteroides asaccarolyticus, Bacteroides gingivalis, and Bacteroides endodontalis in a new genus, Porphyromonas. Int J Syst Bacteriol 1988. 38128–131.
10. Shah HN, Collins MD. Prevotella, a new genus to include Bacteroides melaninogenicus and related species formerly classified in the genus Bacteroides. Int J Syst Bacteriol 1990. 40205–208.
11. Winkelhoff AJ, Steenbergen TJM, Graaff J. Porphyromonas (Bacteroides) endodontalis:Its role in endodotal infections. J Endod 1992. 18431–433.
12. Steenbergen TJM, Winkelhoff AJ, Grenier D, Graff J. Bacteroides endodontalis sp. nov., an Asaccharolytic black-pigemented bacteroides species from infected dental root canals. Int J Syst Bacteriol 1984. 2118–120.
13. Slots J, Genco RJ. Direct hemagglutination technique for differentiating Bacteroides asaccarolyticus oral strains from nonoral strains. J Clin Microbiol 1979. 10371–374.
14. Herweijer JA, Loos BG, Neiders ME. Characterization of total membrane proteins of Porphyromonas endodontalis. J Endod 1992. 18620–624.
15. Stubbs S, Park SF, Bishop PA, Lewis MAO. Direct detection of Prevotella intermedia and P. nigrescens in suppurative oral infection by amplication of 16S rRNA gene. J Med Microbiol 1999. 181017–1022.
16. Gharbia SE, Haapasalo M, Shah HN, Kotiranta A, Lounatmaa K, Pearce MA, Devine DA. Characterization of Prevotella intermedia and Prevotella nigrescens isolates from periodontic and endodontic infections. J periodontol 1994. 6556–61.
17. Shah HN, Gharbia SE. Biochemical and chemical studies on strains designated Prevotella intermedia and proposal of a new pigmented species, Prevotella nigrescens sp. nov. Int J Syst Bacteriol 1992. 42542–546.
18. Nisengard R, Newman MG. Oral microbiology and immunology 1991. second editionth ed. 213–216.
19. Baumgartner JC, Watkins BJ, Bae KS, Xia T. Association of black-pigmented bacteria with endodontic infections. J Endod 1999. 25413–417.
20. Bae KS, Baumgartner JC, Shearer TR, David LL. Occurence of Prevotella nigrescens and Prevotealls intermedia in infections of Endodontic Origin. J Endod 1997. 23620–623.
21. Sundqvist G, Johnasson E, Sjogren U. Prevalence of black-pigmented bacteroides species in root canal infections. J Endod 1989. 1513–19.
22. Siqueira JF, Rocas IN, Oliveira JCM, Santos KRN. Detection of putative oral pathogens in acute periradicular abscesses by 16S rDNA-directed polymerase chain reaction. J Endod 2001. 27164–167.
23. Siqueria JF, Rocas IN, Oliveira JCM, Santos KRN. Molecular detection of black-pigmented bacteria in infections of endodontic origin. J Endod 2001. 27563–566.
24. Kim YH, Kim SH. Diagnosis Clinical Microbiology 2000. 284–406.
25. Haapasalo M. Bacteroides spp. in dental root canal infections. Endod Dent Traumatol 1989. 51–10.
26. Bogen G, Slots J. Black-pigmented anaerobic rods in closed periapical lesions. Int Endod J 1999. 32204–210.
27. Slots J, Ashimoto A, Flynn MJ. Detection of putative periodontal pathogens in subgingival specimens by 16S ribosomal DNA amplication with the polymerase chain reaction. Clin Infect Dis 1995. 20S304–S307.
28. Steenbergen TJM, Menard C, Tijhof CJ, Mouton C, Graaff J. Comparison of three molecular typing methods in studies of transmission of Porphyronas gingivalis. J Med Microbiol 1993. 14416–421.
29. Summanen P, Baron EJ, Citron DM, Strong CA, Wexler HM, Finegold SM. Wadsworth Anaerobic bacteriology Manual 1993.
30. Moncla BJ, Braham P. Detection of sialidase (Neuraminidase) activity in actinomyces species by using 2'-(4-Methylumbelliferyl)α-D-N-Acetylneura-minic acid in a filter paper spot test. J Clin Microbiol 1989. 27182–184.
31. Moncla BJ, Braham P, Rabe LK, Hillier SL. Rapid presumptive identification of black-pigmented gram-negative anaerobic bacteria by using 4-methylumbelliferone derivatives. J Clin Microbiol 1991. 291955–1958.
32. Slots J. Enzymatic characterization of some oral and nonoral gram-negative bacteria with the API ZYM system. J Clin Microbiol 1981. 14288–294.
33. Wayman BE, Murata SM, Almeida RJ, Fowler CB. A bacteriological and histological evaluation of 58 periapical lesions. J Endod 1992. 18152–155.
34. Matto J, Asikainen S, Vaisanen ML, Rautio M, Saarela M, Summanen P, Finegold S, Jousimies-Somer H. Role of Porphyromonas gingivalis,Prevotella intermedia, and Prevotella nigrescens in extraoral and some odontogenic infections. Clin Infect Dis 1997. 25S194–S198.