Chronic Presence of Epstein Barr Virus in Sulcular and Junctional Epithelial Tissue From Gingiva is Associated With Severe Periodontitis

Inclusion Criteria: * Men exclusively * 12 years minimum * 2 patients affected by chronic periodontitis * 2 patients affected by aggressive periodontitis * 2 healthy patients (orthodontics extraction) * Subject who have read and understood the information note relative under investigation and who have signed the informed consent * Subject whose legal representative signed the parental consent (if minor patient) Exclusion Criteria: * Patient with contre-indication to dental extraction * Patient witn serious blood disease * Patient who exhibits systemic condition incompatible with the realization of the study * Patient treated with oral retinoids, bisphosphonates, oral anticoagulants and anticonvulsivants * Patient who presents za buccal carcinoma treated with radiotherapy * Patient who have received during the past 6 months: anti-inflammatory drugs, anti-cancerous or immunosuppressive chemiotherapy * Patient who presents a linguistic or psychic incapacity to understand information * Female patient