Dr. Enzo Foti “Progressive Periodontal Healing of A Severe Two-Wall Intrabony Defect Treated by Fibrin Sealant-GTR Technique: Case Report with 15 Years of Follow-up”. BACKGROUND The role of the Fibrin Sealant (FS), obtained from human donors, in GTR and GBR is supported by many scientific evidence, but it is still at low knowledge in dentistry practice. The main actions of FS are: hemostatic, adhesive, sealant, insulating, impermeabilizing. At molecular level it is demonstrated that the fibrinogen, before its conversion to…