1. Department of Operative Dentistry, Periodontology and Preventive Dentistry, Medical Faculty, RWTH Aachen University, Aachen, Germany
2. Chair for Laser Technology, RWTH Aachen University, Aachen, Germany
3. Department of Dental Materials and Biomaterials Research (ZWBF), RWTH Aachen University Hospital, Aachen, Germany
4. Fraunhofer Institute for Laser Technology (ILT), Aachen, Germany