• An up-to-date classification:

• allows the clinician to be aware of the full range of periodontal diseases and conditions that can affect the patient

• provides a basis for the diagnosis and subsequent management of the patient

• The classification in Figs 2.1–2.8 derives from the 1999 International Workshop for the Classification of Periodontal Diseases and Conditions, which was convened to reclassify these diseases and conditions due to a previous lack of consensus

• The new categories added to the 1999 classification were:

• gingival diseases

• necrotising periodontal diseases

• abscesses

• periodontitis associated with endodontic lesions

• developmental or acquired deformities and conditions