Document Type : Original Article
Authors
1 Department ofEndodontics, faculty of oral and dental medicine, Elminia university, Elminia ,Egypt Department of Endodontics, Faculty of dentistry, Misr University for Science and Technology, Egypt
2 Department of Endodontics, Faculty of dentistry, Cairo University, Egypt.
3 Department of Endodontics, Faculty Dentistry, Egyptian Russian University, Egypt
4 Department of Endodontics, National Research Centre, Egypt.
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