Nadhum, Noor, Rasha Jehad, Shatha AbdulKareem, and Raghad Al-Hashimi. “Assessing The Radiopacity of Three Resin Composite Materials Using a Digital Radiography Technique”. Journal of Baghdad College of Dentistry 29, no. 3 (September 15, 2017): 26-30. Accessed November 29, 2019. http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/2210.