C Paderni1, V Rodolico2, D Ciavarella3, L Lo Muzio3, G Campisi1. 1. Department of Surgical, Oncological and Oral Sciences, Sector of Oral Medicine "V. Margiotta", University of Palermo, Italy. 2. Department of Sciences for Health Promotion, University of Palermo, Italy. 3. Department of Surgical Sciences, University of Foggia, Italy.