Document Type : Original Article
Authors
1 BDS 2008 Cairo University. Assistant researcher, Department of Orthodontics and Pediatric Dentistry, National Research Center.
2 Professor of Orthodontics and Head of Orthodontic Department, Faculty of Dental Medicine for Girls, Al-Azhar University Girls’ Branch.
3 Assistant Professor, orthodontic department –faculty of dental medicine for girls Al-zhar university
4 Assistant Professor of orthodontics, Department of Orthodontics and Pediatric Dentistry, National Research Center.
Abstract
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