Affiliation: | 1. Faculty of Health Sciences, Department of Odontology, School of Dentistry, University of Pretoria, Pretoria, South Africa;2. Faculty of Health Sciences, Department of Oral and Maxillofacial Pathology, School of Dentistry, University of Pretoria, Pretoria, South Africa;3. Faculty of Health Sciences, Department of Maxillofacial and Oral Surgery, School of Dentistry, University of Pretoria, Pretoria, South Africa;4. Faculty of Dentistry, Department of Endodontics, Cairo University, Cairo, Egypt |