1. Department of Prosthetic Dentistry, Faculty of Dentistry, Wrocław Medical University, 50425 Wrocław, Poland
2. Division of Dental Materials, Faculty of Dentistry, Wrocław Medical University, ul. Krakowska 26, 50425 Wrocław, Poland
3. Department of Oral Surgery, Faculty of Medicine and Dentistry, Medical University of Silesia in Katowice, 41902 Bytom, Poland