B Giuliano Maino1, Emanuele Paoletto2, Luca Lombardo3, Giuseppe Siciiani4. 1. Department of Orthodontics, University of Ferrara, Ferrara, Italy; University of Insubria, Varese, Italy; Private Practice of Orthodontics in Vicenza, Italy. 2. Lab Orthomodul, Thiene, Italy. 3. Department of Orthodontics, University of Ferrara, Via Montebello 31, Ferrara 44100, Italy. lulombardo@tiscali.it. 4. Department of Orthodontics, University of Ferrara, Via Montebello 31, Ferrara 44100, Italy.