1. Private Office, Waltrop, Germany.
2. Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
3. Department of Prosthodontics, Faculty of Dentistry, Trakya University, Edirne, Turkey.
4. Lab of Strength of Materials and Biomechanics, Faculty of Mechanical Engineering, Istanbul Technical University, Istanbul, Turkey.
5. Department of Periodontology, School of Dentistry, Faculty of Health, University Witten/Herdecke, Witten, Germany.