1. Professor Yahia Eltayib Ibrahim

Professor in Conservative dentistry, Faculty of Dentistry, University of Khartoum,     Khartoum, Sudan

E-mail Address: yeibrahim@yahoo.com

2. Dr. Neamat Hassan Abu-bakr, BDS, DSS, MDSC, PhD

P.O. Box 694, Khartoum, 111-11, Khartoum, Sudan

Mobile Tel:  0912279332

E-mail address: nhabubakr@uofk.edu or neamat@yahoo.com