Affiliation: | 1. Private Institute for Periodontology and Implantology, , Munich, Germany;2. Department of Periodontology, Julius‐Maximilians University, , Wurzburg, Germany;3. Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, , Zurich, Switzerland;4. Department of Prosthodontics, Dental School, Free University of Berlin, , Berlin, Germay |