Document Type : Original Article
Authors
1 B.DS. 2009G. Faculty of Dental Medicine University of Science and Technology –Sana’a-Yemen.
2 Lecturer of Orthodontics, Orthodontic Department, Faculty of Dental Medicine for Boys, Al-Azhar University, Cairo, Egypt.
3 Oral and Maxillofacial Surgeon and Assistant Researcher in the Oro-dental Genetics Department of the Human Genetics Division at the National Research.
4 Professor of Orthodontics, Head of Orthodontic Department, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt.
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