1. Clinic of Reconstructive Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
2. Department of Conservative Dentistry, Faculty of Dentistry University of Chile Santiago Chile
3. Univ. Bordeaux, INSERM, BioTis, U1026 Bordeaux France
4. CHU de Bordeaux, Service de Médecine Bucco‐Dentaire Bordeaux France
5. Department of Periodontics and Oral Medicine, Dental School University of Michigan Ann Arbor Michigan USA