1. Department of Prosthodontics, Yerevan State Medical University after M. Heratsi, Armenia
2. Department of Prosthodontics, Yerevan State Medical University after M. Heratsi, Armen
3. Dental Art Systems, Russia
4. Clinical Resident, Department of Prosthodontics, Yerevan State Medical University after M. Heratsi, Armenia
5. Department of Propaedeutics of Dental Diseases, Peoples Friendship University of Russia, Russia