Abstract
The assessment and diagnosis of periodontal diseases has become an active and controversial area of research which incorporates both new technologies and new concepts. Previous efforts have demonstrated the potential value of diagnostic testing in differentiating different diseases, in evaluating disease progression, and in monitoring the response to therapy. A few studies have even shown promise in predicting the response to therapy. Some of this work has incorporated proven diagnostic principles which allow a comparison between techniques. It is clear, however, that future work would benefit from an increased incorporation of these diagnostic principles and a recognition of the value of a sequential use of tests. Much work remains and many questions cannot be adequately answered at this time, but we should not lose sight of the great progress which has been made in the area of assessing and diagnosing periodontal diseases.