Dr. Ahmed Jawdat Rashad BDS and hussain sadiq hussain al zadiy, “Evaluation of the Quality of Root Canal Obturation Performed by Periodic Residents and Its Impact on Postoperative Pain using Peri-Apical Radiographs: A Retrospective Cross-Sectional Study”, International Journal of Pharmaceutical and Bio Medical Science, vol. 5, no. 7, pp. 431–435, Jul. 2025.