elnaz moslehifard assistant professor, department of prosthodontics, faculty of dentistry, tabriz university of medical sciences, tabriz, iran farzaneh lotfipour associate professor, faculty of pharmacy, drug applied research center, tabriz university of medical sciences, tabriz, iran mahmood robati anaraki assistant professor, department of prosthodontics, faculty of dentistry, tabriz university of medical sciences, tabriz, iran elnaz shafee assistant professor, department of prosthodontics, faculty of dentistry, tabriz university of medical sciences, tabriz, iran shabnam tamjid-shabestari assistant professor, department of pediatric, faculty of dentistry, zanjan university of medical sciences, zanjan, iran tahereh ghaffari assistant professor, department of prosthodontics, faculty of dentistry, tabriz university of medical sciences, tabriz, iran