1. University of Perugia; Civil and Environmental Engineering Department; UdR INSTM, Strada di Pentima 4 - 05100 Terni Italy
2. Faculty of Medicine and Surgery; Chair of Clinical Odontostomatologic; Chief: prof. Potito D'Errico; University of Perugia; S. Andrea delle Fratte 06156 Perugia Italy
3. Faculty of Medicine and Surgery; Department of Restorative Dentistry; University of Perugia; S. Andrea delle Fratte 06156 Perugia Italy
4. Institute for Polymer Science and Technology; ICTP-CSIC, Juan De la Cierva 3 - 28006 Madrid Spain