Aula, R. A. . and Mikaeel, J. M. . (2022) “Vertical marginal gap evaluation of PEEK and Zirconia crowns using extra-oral scanner and CAD/CAM systems (An Invitro study)”., Erbil Dental Journal (EDJ), 5(1), pp. 37–43. doi: 10.15218/edj.2022.5.