1. *Panagiotis Ntovas, DDS, MSc, scientific associate, Department of Operative Dentistry, National and Kapodistrian, University of Athens, Greece
2. Nikolaos Gogolas, DDS, private practice, Athens, Greece
3. George Gogolas, DDS, private practice, Athens, Greece
4. Eleni Mougiou, DDS, private practice, Athens, Greece
5. Efstatios Papazoglou, DDS, MSc, PhD, Department of Operative Dentistry, National and Kapodistrian, University of Athens, Greece