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1. Professor of Orthodontics, Faculty of Dental Medicine, Al-Azhar University, Girls Branch, Prof & Head of Orthodontic Depart. Nahda University Egypt. 2. Lecturer of Operative Dentistry, Faculty of Dental Medicine, Al-Azhar University, Girls' Branch, Cairo, Egypt. 3. Professor, Oral Pathology, Faculty of Dentistry, Cairo University.  Manuscript Info Abstract   Manuscript History Received: 05 May 2020 Final Accepted: 10 June 2020 Published: July 2020

EFFECT OF NANO HYDROXYAPATITE ON NORMAL AND GAMMA IRRADIATED HUMAN ENAMEL SURFACE AFTER ORTHODONTIC TREATMENT (SEM STUDY)