Giovan Paolo Pini Prato1, Leandro Chambrone2,3,4. 1. Tuscany Academy of Dental Research (ATRO), Florence, Italy. 2. School of Dentistry, Ibirapuera University (Unib), São Paulo, Brazil. 3. Unit of Basic Oral Investigation (UIBO), School of Dentistry, Universidad El Bosque, Bogota, Colombia. 4. Department of Periodontics, College of Dentistry and Dental Clinics, The University of Iowa, Iowa City, IA, USA.