Document Type : Original Article
Authors
1 Assistant Lecturer in Orthodontic Department, Faculty of Dentistry, Al-Azhar University, Assiut.
2 Professor and head of Orthodontic Department, Faculty of Dentistry, Al-Azhar University, Assiut
3 Ass. Professor in Arthodontic Department, Faculty of Dentistry, Al-Azhar University, Assuit
Abstract
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