1. Division of Dental Technology, Department of Biomedical Sciences, University of West Attica, Athens, Greece.
2. Experimental Techniques Centre, Brunel University London, Uxbridge, United Kingdom.
3. Castolin Eutectic-Monitor Coatings Ltd, Newcastle, United Kingdom.
4. Department of Materials Science and Engineering, School of Engineering, University of Ioannina, Ioannina, Greece.