1. Department
of Microsystems Engineering (IMTEK) and Freiburg Centre for Interactive
Materials and Bioinspired Technologies (FIT), Albert-Ludwigs-Universität, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
2. Department
of Operative Dentistry and Periodontology, Center for Dental Medicine of the Albert-Ludwigs-Universität Freiburg, Hugstetter
Str. 55, 79106 Freiburg, Germany