Al-Hashimi R, Habeeb M, Al-Kinani A. A Comparative Evaluation of Apical Seal Associated with Ultrasonic Retrograde Cavities Filled with Bioactive Material (In Vitro Study). J Bagh Coll Dent [Internet]. 14Sep.2016 [cited 20Nov.2019];28(3):15-1. Available from: http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/1420