1. Department of Endodontics Restorative Dentistry, School of Dental Medicine; University of Zagreb; Zagreb Croatia
2. Department of Dental Materials Fixed Prosthodontics; University of Siena, Policlinico “Le Scotte”; Siena Italy
3. Department of Medical Biotechnologies, School of Dental Medicine; University of Siena; Siena Italy
4. Department of Restorative Sciences and Biomaterials, Goldman School of Dental Medicine Boston; Boston University; Boston Massachusetts