Hailan, Sarah, and Mustafa Al-Khatieeb. “Antimicrobial Efficacy of Silver, Zinc Oxide, and Titanium Dioxide Nanoparticles Incorporated in Orthodontic Bonding Agent”. Journal of Baghdad College of Dentistry 31, no. 3 (September 27, 2019): 10-16. Accessed November 17, 2019. http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/2693.