You must have the Acrobat Reader program to open it. This document summarizes how the new classification for periodontal diseases and conditions presented in Annals of Periodontology, Volume 4 differs from the classification system developed at the 1989 World Workshop in Clinical Periodontics. The new system represents a summation of three days of intense discussion and extensive literature analysis by more than 70 international leaders in periodontics. The American Academy of Periodontology. All rights reserved.
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