[Bacteriological tests in periodontal practice].

The specificity, sensitivity and predictive value of bacteriological tests in periodontology are reviewed. It is stated that the bacteriological aim in periodontal therapy is the change of the subgingival flora in a facultative flora which is compatible with the host. Bacteriological tests can be used to identify indicator bacteria. It is discussed how a microscopical or a bacteriological identification test can support periodontal diagnoses and indication of periodontal therapy.