Document Type : Original Article
Authors
1 Assistant Lecturer of fixed prosthodontic, Faculty of Dental Medicine, Al-Azhar University (Assuit Branch), Egypt.
2 Professor and Head of crowns and bridges Department, Faculty of Dental Medicine for girls Al Azhar University.
3 Professor of Oral Medicine and Periodontology, Faculty of Dental Medicine Al-Azhar University (Assuit Branch).
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