Subgingival microbiota of Brazilian subjects with untreated chronic periodontitis.

Background: Different periodontopathogenic microbiota have been associated with periodontal diseases in several populations. The present investigation determined the subgingival microbiota of untreated chronic periodontitis Brazilians using the checkerboard DNA-DNA hybridization technique.

Methods: Twenty-five periodontitis patients (mean age, 41 +/- 2; mean probing depth [PD], 3.