Document Type : Original Article
Authors
1 Dentist at the Ministry of Health.
2 Professor and Head of Endodontics Department, Faculty of Dental Medicine (for girls) Al-Azhar University.
3 Professor of Microbiology, Faculty of Medicine, Al-Azhar University
4 Lecturer of Endodontics, Faculty of Dental Medicine, Al-Azhar University- Assiut Branch.
Abstract