1. Doctoral Studies of the Faculty of DentistryPomeranian Medical University of Szczecin Szczecin Poland
2. Institute of Materials Science and EngineeringLodz University of Technology Lodz Poland
3. University Laboratory of Materials Research, Medical University of Lodz Lodz Poland
4. Department of General DentistryMedical University of Lodz Lodz Poland
5. Department of Conservative Dentistry and EndodonticsPomeranian Medical University of Szczecin Szczecin Poland