Document Type : Original articles
Authors
1 endodontic department at faculty of dentistry Ain Shames University -Cairo
2 Endodontics, Faculty of dentistry, Ain shams university, Cairo, Egypt.
3 1- Endodontics, faculty of dentistry, Ain shams university, Cairo, Egypt. 2- Restorative dental sciences, College of dentistry, Gulf medical university, Ajman, UAE.
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