H. Al-Rammahi and H. Al-Huwaizi, “Evaluation of the Efficiency of Three Different Obturation Techniques to Obturate the Isthmus Area of Roots Canals Prepared by Two Different Instrumentation Techniques (An In Vitro Study)”, J Bagh Coll Dent, vol. 28, no. 2, pp. 14-18, 1.