1. Division of Restorative and Prosthetic Dentistry The Ohio State University Ohio USA
2. Graduate Prosthodontics, Division of Restorative and Prosthetic Dentistry The Ohio State University Ohio USA
3. Department of Prosthodontics Karadeniz Technical University Turkey
4. Department of Reconstructive Dentistry and Gerodontology School of Dental Medicine, University of Bern Bern Switzerland
5. Privat‐docent, Division of Gerodontology and Removable Prosthodontics University Clinics of Dental Medicine, University of Geneva Geneva Switzerland