Analysis of Osteoimmune Interactions Linking Inflammation and Bone Destruction in Aggressive Periodontitis

Periodontitis are inflammatory diseases characterized by the destruction of the tooth-supporting bone due to increased bone resorption by osteoclasts (OCLs). Two forms are described: chronic periodontitis (CP) and aggressive periodontitis (AP) that differ by the severity and rapidity of bone loss, much more important for AP than CP. In both forms, the link with uncontrolled activation of the immune system is largely admitted. Despite the physiopathology of CP is fairly well studied, very few data are available regarding AP. The investigators aim is to understand the severity of AP by analyzing the proportion and action of immune and mesnchymal cells potentially involved in bone destruction, on biopsies of periodontal granulation tissue (surgical waste) and blood. Three groups of 20 patients will be included: affected with AP, CP or controls (necessitating an extraction of wisdom teeth).