1. Private Practitioner, Ankara 06100, Turkey
2. Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara 06100, Turkey
3. Clinic of Chewing Function Disturbances and Dental Biomaterials, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
4. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland