Ausenda F.1,2, Barbera E.1, Cotti E.3, Romeo E.1, Natto Z.4, Valente N.A.3,51.Department of Biomedical, Surgical and Dental Sciences, University of Milan, Via Beldiletto 1, 20142 Milan, Italy2. Visiting Assistant Professor, Department fo Periodontology, Tufts University School of Dental Medicine, Boston, MA, USA3. School of Dental Medicine, Department of Surgical Sciences, Faculty of Medicine and Surgery, University of Cagliari, Cagliari, Italy4. Department of Dental Public Health, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia5. Department of Periodontology, School of Dental Medicine, State University of New York at Buffalo, Buffalo, NY, USACorresponding author : Nicola Alberto Valente DDS, MS, PhD, Cittadella Universitaria snc, Blocco I, Facoltà di Medicina e Chirurgia, Università di Cagliari, Monserrato, CA, Italy – nicola.valente@unica.it