There is substantial evidence supporting the role of certain oral bacteria species in the onset and progression of periodontitis. Nevertheless, results of independent-culture diagnostic methods introduced about a decade ago have pointed to the existence of new periodontal pathogens. However, the data of these studies have not been evaluated together, which may generate some misunderstanding on the actual role of these microorganisms in the etiology of periodontitis. The aim of this systematic review was to determine the current weight of evidence for newly identified periodontal pathogens based on the results of "association" studies. This review was conducted and reported in accordance with the PRISMA statement. The MEDLINE, EMBASE, and Cochrane databases were searched up to September 2013 for studies (1) comparing microbial data of subgingival plaque samples collected from subjects with periodontitis and periodontal health and (2) evaluating at least 1 microorganism other than the already-known periodontal pathogens. From 1,450 papers identified, 41 studies were eligible. The data were extracted and registered in predefined piloted forms. The results suggested that there is moderate evidence in the literature to support the association of 17 species or phylotypes from the phyla Bacteroidetes, Candidatus Saccharibacteria, Firmicutes, Proteobacteria, Spirochaetes, and Synergistetes. The phylum Candidatus Saccharibacteria and the Archaea domain also seem to have an association with disease. These data point out the importance of previously unidentified species in the etiology of periodontitis and might guide future investigations on the actual role of these suspected new pathogens in the onset and progression of this infection.
Objective The aim of this study was to evaluate the association of Porphyromonas endodontalis, Filifactor alocis and Dialister pneumosintes with the occurrence of periodontitis.Material and Methods Thirty subjects with chronic periodontitis (ChP) and 10 with periodontal health (PH) were included in the study. Nine subgingival biofilm samples were collected as follows: i) PH group - from the mesial/buccal aspect of each tooth in two randomly chosen contralateral quadrants; ii) ChP group - from three sites in each of the following probing depth (PD) categories: shallow (≤3 mm), moderate (4-6 mm) and deep (≥7 mm). Checkerboard DNA-DNA hybridization was used to analyze the samples.Results We found the three species evaluated in a higher percentage of sites and at higher levels in the group with ChP than in the PH group (p<0.05, Mann-Whitney test). We also observed these differences when the samples from sites with PD≤4 mm or ≥5 mm of subjects with ChP were compared with those from subjects with PH (p<0.05, Mann-Whitney test). In addition, the prevalence and levels of D. pneumosintes, and especially of F. alocis were very low in healthy subjects (0.12x105 and 0.01x105, respectively).Conclusion F. alocis and D. pneumosintes might be associated with the etiology of ChP, and their role in the onset and progression of this infection should be further investigated. The role of P. endodontalis was less evident, since this species was found in relatively high levels and prevalence in the PH group.
Objective To identify and quantify the levels of three bacterial species that have recently been identified as potential "new" periodontal pathogens (Enterococcus faecalis, Staphylococcus aureus and Staphylococcus warneri) in subjects with periodontal health and generalized chronic periodontitis. Methods RESUMOObjetivo Identificar e quantificar os níveis de três espécies bacterianas que foram recentemente apontadas como possíveis "novos" patógenos periodontais (Enterococcus faecalis, Staphylococcus warneri e Staphylococcus aureus), em indivíduos periodontalmente saudáveis e com periodontite crônica generalizada. MétodosA amostra foi composta por 30 indivíduos adultos com periodontite crônica generalizada e 10 periodontalmente saudáveis. Nove amostras de biofilme subgengival foram coletadas por indivíduo e analisadas individualmente pela técnica de checkerboard DNA-DNA hybridization. ResultadosOs níveis médios de E. faecalis e S. warneri foram maiores no grupo com periodontite crônica do que no de saúde periodontal (p<0,05). Além disso, um maior percentual de indivíduos com periodontite estavam colonizados pelas três espécies avaliadas em comparação com os indivíduos saudáveis (p<0,05). Essa diferença entre os dois grupos foi de 40 pontos percentuais para E. faecalis (presente em 90% dos indivíduos com periodontite e 50% dos saudáveis) e S. warneri (100% e 60%, respectivamente), e de 26 pontos percentuais para S. aureus (86% e 60%, respectivamente). Conclusão E. faecalis e S. warneri tem potencial para serem patógenos periodontais. O papel do S. aureus foi menos evidente, uma vez que esta espécie estava mais prevalente e em níveis relativamente mais altos do que as outras duas espécies em saúde. Estes dados podem guiar futuros estudos sobre o papel dessas espécies na etiologia das periodontites e ajudar a estabelecer tratamentos mais eficazes para essas infecções.Termos de indexação: Periodontite crônica. Microbiota. Noxas. Doenças periodontais.
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