BAHAR , J., S. ALSALIM, and R. NIAMA DAYEM. “A Novel Nano-Calcium Carbonate-Polyurethane-Based Root Canal Obturation Material: Synthesis and Evaluation of Some Physical Properties”. International Arab Journal of Dentistry (IAJD), Vol. 4, no. 3, Oct. 2013, pp. 97-102, https://journals.usj.edu.lb/iajd/article/view/224.