Giuseppe Perinetti1, Jasmina Primozic2, Lorenzo Franchi3,4, Luca Contardo5. 1. *Department of Medical, Surgical and Health Sciences, University of Trieste, Italy, G.Perinetti@fmc.units.it. 2. **Department of Orthodontics and Jaw Orthopaedics, Medical Faculty, University of Ljubljana, Slovenia. 3. ***Department of Orthodontics, School of Dentistry, University of Florence, Italy. 4. ****Department of Orthodontics and Pediatric Dentistry, School of Dentistry, The University of Michigan, Ann Arbor, MI, USA. 5. *Department of Medical, Surgical and Health Sciences, University of Trieste, Italy.