[Distribution of 3 kinds of periodontal pathogens in subgingival plaques of patients with chronic periodontitis].

OBJECTIVE

To observe the prevalence of Porphyromonas gingivalis(Pg), Treponema denticola(Td) and Bacterides forsythus(Bf) subgingivally in diseased sites of chronic periodontitis (CP) patients.

METHODS

Samples of subgingival plaque were detected by 3 kinds of oligonucleotide DNA probe from 60 sites of CP patients and 10 healthy sites of 10 healthy people.

RESULTS

The positive rates of Pg, Bf and Td in patients were 91.67%, 90.00% and 95.67% respectively; Pg, Bf and Td were detected simultaneously in 83.33% patients and Pg, Bf and Td were found to be related with each other(P < 0.01).

CONCLUSION

Pg, Bf and Td were prominent periodontopathic bacteria and related each other, might exist in complexes in subgingival plaque and coaggretate together.