1. Norbert Hofmann, Priv-Doz Dr med dent, assistant professor, Department of Operative Dentistry and Periodontology, Julius-Maximilians-University of Wuerzburg, Wuerzburg, Germany
2. Alexander Hunecke, Dr med dent, DDS, Department of Operative Dentistry and Periodontology, Julius-Maximilians-University of Wuerzburg, Wuerzburg, Germany