[Evaluation and prognosis of periodontally involved teeth]

One of the most difficult parts of the perio- prosthetic treatment is the evaluation and the prognosis. This paper presents the basic factors affecting a successful prognosis. Factors like bone support, mobility, distribution of the remaining teeth, root morphology, etc. as well as factors like the "patient", abilities of the therapist, etc. has been presented. From our clinical experience and from the review of the literature is presented the basic guideline of a successful prognosis. "Prognosis" is not one of the black arts--it is a system of therapeutic projection based upon successes and failures of the past.