Ahmed, Mohammad Rauf, Rooman Shahzad, and Irshad Nabi Sandhu. 2016. “Effects of Maintaining Apical Patency on Post-Operative Pain in Molars With Necrotic Pulp and Apical Periodontitis”. Annals of Punjab Medical College 12 (1), 59-61. https://doi.org/10.29054/apmc/2018.163.