1. Division of Fixed Prosthodontics, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
2. Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku
3. Department of Dental Materials, Nihon University School of Tokyo
4. Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku