1. Niek J. M. Opdam, PhD, DDS, Radboud Institute for Molecular Life Sciences, Department of Dentistry, Radboud university medical center, Nijmegen, The Netherlands
2. Roland Frankenberger, DMD, PhD, Chair, Department of Operative Dentistry and Endodontics, Philipps University of Marburg and University Hospital Giessen and Marburg, Campus Marburg, Marburg, Germany
3. Pascal Magne, D.M.D., M.Sc., Ph.D, The Don and Sybil Harrington Professor of Esthetic Dentistry, Herman Ostrow School of Dentistry of USC, Division of Restorative Sciences