Differences in prevalence of selected bacterial species in primary endodontic infections from two distinct geographic locations

José F. Siqueira, Il Young Jung, Isabela N. Rôças, Chan Young Lee

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Objective. This study intended to compare the prevalence of 7 putative endodontic pathogens in samples of primary endodontic infections taken from patients of 2 distant geographic locations. Study design. Samples from infected root canals associated with asymptomatic periradicular lesions or from pus aspirated from acute periradicular abscesses were collected from patients in Rio de Janeiro, Brazil, and Seoul, South Korea. South Korean samples were frozen and delivered to Brazil, where all steps in the molecular analysis were performed. DNA was extracted and a species-specific nested polymerase chain reaction assay was used to detect 7 target bacterial species. Results. The most prevalent species detected in Brazilian samples were Porphyromonas endodontalis (79% of the cases), Treponema denticola (79%), and Dialister pneumosintes (76%). The most prevalent species found in South Korean samples were Fusobacterium nucleatum (38% of the cases), Tannerella forsythia (26%), and Treponema maltophilum (24%). Overall, P endodontalis, D pneumosintes, Filifactor alocis, T denticola, and T forsythia were significantly more detected in Brazilian samples than in South Korean samples (P < .05). Conclusions. Findings indicated that the prevalence of some species in infections of endodontic origin may significantly differ from one geographic location to another.

Original languageEnglish
Pages (from-to)641-647
Number of pages7
JournalOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology
Issue number5
Publication statusPublished - 2005 May

Bibliographical note

Funding Information:
This study was supported in part by grants from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), a Brazilian Governmental Institution.

All Science Journal Classification (ASJC) codes

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology
  • General Dentistry


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