[Activation of the immune system in periapical infection. 1. Lympho-monocytoid and plasma cellular elements of reactive soft tissue cells].

The authors have carried out a study on the immunitary mechanisms which stimulate and avoid eventual alterations of infected periapex. Above all the aim of this first study has been the microscopic and ultrastructural valuation of the cellular components that characterize the process of chronic phlogosis of periradicular tissue, lymphocytes T and B, plasmacells and macrophages, and of those even more typical of the soft reactive tissues, fibroblasts and epithelial cells. It's just the interaction among these immunocompetent cells which determines the structural change of the periapical bone whose most common image of radiotransparence make it possible to diagnose the sufference of the pulpo-periapical system.