Eid, G. E. - H., and L. M. Abdelgawad,  "* Associate Professor in Endodontics, Endodontic Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt. ** Associate Professor in Endodontics, Medical Applications Department, National Institute of Laser Enhanced Sciences NILES, Cairo U",  E.D.J., vol. 61, issue 3, 2015.