1. Department of Oral Surgery and Stomatology, School of Dental Medicine University of Bern Bern Switzerland
2. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine University of Bern Bern Switzerland
3. Department of Prosthodontics University of São Paulo School of Dentistry (FO‐USP) São Paulo Brazil
4. Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine University of Bern Bern Switzerland
5. Division of Restorative and Prosthetic Dentistry The Ohio State University College of Dentistry Columbus Ohio USA