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Acute necrotising ulcerative gingivitis is a relatively rare condition and is characterised clinically by necrosis of the free gingival margin,the crest of the gingiva and the interdental papillae,etc.
Most of the patients develop systemic manifestation in the form of leukocytosis, tachycardia and gastro intestinal disturbance etc.
Process sometimes lead to a loss of attachment and the development of associated periodontitis(necrotizing ulcerative periodontitis)or spread to adjacent soft tissue(necrotizing ulcerative mucositis;necrotizing stomatitis)
If necrotizing infection extends through the mucosa to the skin of the face,it is typically termed noma(cancrum oris)