1 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland; City of Turku, Welfare Division, Finland. Electronic address: pekka.vallittu@utu.fi.
2 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland; Department of Crown and Bridge, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan.
3 Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Croatia.
4 Dental Practitioner, Hawkhurst, UK.
5 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
6 Department of Preventive and Restorative Dentistry, Radboud University Medical Center, Nijmegen, The Netherlands.
7 Department of General Dentistry, University of Rochester, Eastman Institute for Oral Health, Rochester, NY, USA.
8 Dental Practitioner, Kosice, Slovakia.
9 KU Leuven-BIOMAT, Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals Leuven, Leuven, Belgium.
10 Dental Practitioner, Tonbridge, UK.
11 University of Heidelberg, Department of Conservative Dentistry, Heidelberg, Germany.
12 University of Zurich, Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland.