1 Department of Technology of Materials and Devices in Dental Medicine, "Victor Babes" University of Medicine and Pharmacy from Timisoara, Timisoara, Romania.
2 Department of Oral Pathology, "Victor Babes" University of Medicine and Pharmacy from Timisoara, Faculty of Dental Medicine, Timisoara, Romania.
3 Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania.
4 Laboratorio de Optica, Universidad de Murcia, Murcia, Spain.