Affiliation: | 1. Department of Removable Prosthodontics, Faculty of Dentistry, Suez Canal University, El Salam District, Egypt;2. Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt;3. Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Zagazig University, Ash Sharqia Governorate, Egypt |