8[1]Glosson CR. Haller RH. Dove SB, et al. A comparison of root canal prepar ations using Ni - Ti hand. Ni - Ti engine - driven, and K - Flex endodontic instruments. J Endodon, 1991,21 (3): 146-151.
9[6]Kielt LW,Montgomery S. The effect of endosonic instrumentation in simulated curved root canal[J]. J Endod,1987,13(5) :215.
10[7]Martin H. Cunningham WT. Norris JP. et al. Ultrasonic versushand filing of dentin: A quantitative study[J]. Oral surg Med Oral Pathal, 1980. 49(1 ) :79.
