Ann Periodontol 1 Classification systems are necessary in order to provide a frame-work in which to scientifically study the etiology, pathogenesis, and treatment of diseases in an orderly fashion. In addition, such systems give clinicians a way to organize the health care needs of their patients. The last time scientists and clinicians in the field of periodontology and related areas agreed upon a classi-fication system for periodontal diseases was in 1989 at the World Workshop in Clinical Periodontics. 1 Subsequently, a simpler clas-sification was agreed upon at the 1 st European Workshop in Peri-odontology. 2 These classification systems have been widely used by clinicians and research scientists throughout the world. Unfor-tunately, the 1989 classification had many shortcomings includ-ing: 1) considerable overlap in disease categories, 2) absence of a gingival disease component, 3) inappropriate emphasis on age of onset of disease and rates of progression, and 4) inade-quate or unclear classification criteria. The 1993 European clas-sification lacked the detail necessary for adequate characteriza-tion of the broad spectrum of periodontal diseases encountered in clinical practice. The need for a revised classification system for periodontal diseases was emphasized during the 1996 World Workshop in Periodontics. 3 In 1997 the American Academy of Periodontology responded to this need and formed a commit-tee to plan and organize an international workshop to revise the classification system for periodontal diseases. The proceedings in this volume are the result of this reclassification effort. The process involved development by the Organizing Committee of an outline for a new classification and identification of individ-uals to write state-of-the-science reviews for each of the items on the outline. The reviewers were encouraged to depart from the preliminary outline if there were data to support any mod-ifications. On October 30–November 2, 1999, the International Workshop for a Classification of Periodontal Diseases and Con-ditions was held and a new classification was agreed upon (Fig. 1). This paper summarizes how the new classification for peri-odontal diseases and conditions presented in this volume differs from the classification system developed at the 1989 World Workshop in Clinical Periodontics. 1 In addition, an analysis of the rationale is provided for each of the modifications and changes. Ann Periodontol 1999;4:1-6.
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