1. Department of Restorative Dentistry and Endodontics, Clinic of Dentistry, Medical Faculty, University of Nis, Nis, Serbia
2. Department of Oral Medicine and Periodontology, Clinic of Dentistry, Medical Faculty, University of Nis, Nis, Serbia
3. Department of Prostetic Dentistry, Clinic of Dentistry, Medical Faculty University of Nis, Nis, Serbia