“Comparison Between Immediate and Delayed Post Space Preparation on the Apical Seal Prepared by Hand Protaper Instruments”. Mustansiria Dental Journal 5, no. 3 (January 25, 2018): 232–238. Accessed April 21, 2025. https://mdj.uomustansiriyah.edu.iq/index.php/mdj/article/view/543.