Document Type : Review Article
Authors
1 Department of Oral Medicine, Periodontology, Diagnosis and Dental Radiology, Faculty of Dental Medicine, Al-Azhar University, Assiut Branch
2 Oral Medicine, Periodontology, Oral Diagnosis and Dental Radiology. Faculty of Dental Medicine Al-Azhar University (Assiut- Branch)
3 Department of Oral Medicine, Periodontology, Oral Diagnosis and Dental Radiology, Faculty of Dental Medicine, Al-Azhar University, Assiut branch, Egypt.
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