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The new classification of periodontitis made several changes and updated the AAP 1999 classification system. A universal periodontitis diagnosis has been introduced for the case definitions of all plaque related periodontal diseases. That replaces the previous periodontitis scheme that distinguished “chronic” and “aggressive” periodontitis. All biofilm related periodontal disease under a single category as “periodontitis” are further characterized based on a staging and grading system. Staging expresses the severity of disease at the first clinical examination and also the expected complexity of disease management. The grading evaluates pathobiological features of the disease, the estimated rate of the progression of periodontitis based on the analysis of patient’s dental and medical histroy, the risk factors. The risk factors for the further diseases progression and all the factors that might hamper the predictability of therapy should also be evaluated. The periodontal state or the planned invasive periodontal therapy should also be assessed as a potential risk factor for systemic diseases. The new classification system maintained with some modification the 1999 AAP’s classification of Necrotizing Periodontal Diseases (NPD), characterized by typical clinical signs of pain, spontaneous bleeding and papilla necrosis. It is still a distinct category of periodontitis in compromised patients mostly with altered host immune responses. All Endo-periodontal lesions are the consequence of a pathological communication between the pulp and periodontal tissues. This can occur in an acute or a chronic form, and can be further classified according to the clinical signs and symptoms that determines the prognosis and predictability of its management. Periodontal abscesses are acute lesions with localized accumulation of pus within the connective tissues of the periodontal pocket-wall. Its main characteristic is the rapid onset with immediate tissue destruction and the possibility of systemic dissemination.

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Abstract: A new periodontitis classification scheme has been adopted, in which forms of the disease previously recognized as “chronic” or “aggressive” are now grouped under a single category (“periodontitis”) and are further characterized based on a multi‐dimensional staging and grading system. Staging is largely dependent upon the severity of disease at presentation as well as on the complexity of disease management, while grading provides supplemental information about biological features of the disease including a history‐based analysis of the rate of periodontitis progression; assessment of the risk for further progression; analysis of possible poor outcomes of treatment; and assessment of the risk that the disease or its treatment may negatively affect the general health of the patient. Necrotizing periodontal diseases, whose characteristic clinical phenotype includes typical features (papilla necrosis, bleeding, and pain) and are associated with host immune response impairments, remain a distinct periodontitis category. Endodontic‐periodontal lesions, defined by a pathological communication between the pulpal and periodontal tissues at a given tooth, occur in either an acute or a chronic form, and are classified according to signs and symptoms that have direct impact on their prognosis and treatment. Periodontal abscesses are defined as acute lesions characterized by localized accumulation of pus within the gingival wall of the periodontal pocket/sulcus, rapid tissue destruction and are associated with risk for systemic dissemination. [ABSTRACT FROM AUTHOR]

A new periodontitis classification scheme has been adopted, in which forms of the disease previously recognized as "chronic" or "aggressive" are now grouped under a single category ("periodontitis") and are further characterized based on a multi-dimensional staging and grading system. Staging is largely dependent upon the severity of disease at presentation as well as on the complexity of disease management, while grading provides supplemental information about biological features of the disease including a history-based analysis of the rate of periodontitis progression; assessment of the risk for further progression; analysis of possible poor outcomes of treatment; and assessment of the risk that the disease or its treatment may negatively affect the general health of the patient. Necrotizing periodontal diseases, whose characteristic clinical phenotype includes typical features (papilla necrosis, bleeding, and pain) and are associated with host immune response impairments, remain a distinct periodontitis category. Endodontic-periodontal lesions, defined by a pathological communication between the pulpal and periodontal tissues at a given tooth, occur in either an acute or a chronic form, and are classified according to signs and symptoms that have direct impact on their prognosis and treatment. Periodontal abscesses are defined as acute lesions characterized by localized accumulation of pus within the gingival wall of the periodontal pocket/sulcus, rapid tissue destruction and are associated with risk for systemic dissemination., (© 2018 American Academy of Periodontology and European Federation of Periodontology.)