1. Department of Experimental Orofacial Medicine, School of Dental Medicine; Philipps University; Marburg Germany
2. Department of Oral Periodontology, School of Dentistry; Ain Shams University; Egypt
3. BAM Federal Institute for Materials Research and Testing; Berlin Germany
4. Imaging Facility, Medical School; Justus Liebig University of Giessen
5. Department of Prosthodontics, School of Dentistry; Philipps University; Marburg Germany