• Attempts to classify periodontitis have struggled to decide if there are different diseases or variations of a single disease. • There is no evidence to support differentiating “chronic” and “aggressive” periodontitis. • Three forms of periodontitis have been identified: (1) periodontitis, (2) necrotising periodontitis, (3) periodontitis as a direct manifestation of systemic diseases. • A classification system must include complexity and risk factors as well as disease severity. • Individual cases of periodontitis should be characterised according to the stage and grade of the disease.
Authors Mariano Sanz and Maurizio Tonetti
European Federation of Periodontology
Published March 2019
© European Federation of Periodontology
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