Putative periodontal pathogens colonizing oral mucous membranes in denture‐wearing subjects with a past history of periodontitis

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<jats:p><jats:bold>Abstract</jats:bold> The prevalence of selected putative periodontal pathogens colonizing oral mucous membranes was investigated in 26 denture‐wearing subjects with a history of periodontitis. The microbiota of the oral cavity of these subjects was examined on average 9.3 years after extraction (range: 1‐40 years). Samples were taken from several locations on the oral mucous membranes, from saliva and from plaque attached to the upper and lower denture. <jats:italic>Actinobacillus actinomycetemcomitans</jats:italic> was not detected in any of the 26 edentulous subjects. <jats:italic>Porphyromonas gingivalis</jats:italic> was detected in 2 subjects (proportion of cultivable flora: 0.002% and 12.5%). <jats:italic>Prevotella intermedia</jats:italic> was recovered from 7 subjects with a mean proportion of 0.5% (range < 0.001%‐6.3%). Analysis showed that subjects harbouring <jats:italic>P. intermedia</jats:italic> were wearing full dentures for a longer period of time (mean: 20.2 years) than subjects in which <jats:italic>P. intermedia</jats:italic> could not be detected (mean: 6.6 years). This result suggests that the absence of <jats:italic>P. intermedia</jats:italic> shortly after extraction may reflect only a temporary event. Other <jats:italic>Prevotella</jats:italic> species were found in 22 subjects, constituting < 2% of the total cultivable flora (range 0.01%‐10.5%)). In conclusion, the low prevalence of <jats:italic>P. gingivalis</jats:italic> and the absence <jats:italic>of A. actinomycetemcomitans</jats:italic>, suggest that the oral cavity of edentulous subjects may not be regarded as a habitat for these species. The preferable habitat of the <jats:italic>Prevotella</jats:italic> spp. seems to be the oral mucous membranes, possibly with the exception of <jats:italic>P. intermedia.</jats:italic></jats:p>

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