1A1-Sudani D, Grande NM, Plotino G, et al. Cyclic fatigue of nickel-titanium rotary instruments in a double (S- shaped) simulated curvature [ J ]. J Endod, 2012, 38 (7) : 987 - 989.
2Zhang L, Luo HX, Zhou XD, et al. The shaping effect of the combination of two rotary nickel-titanium instruments in simulated S- shaped canals [ J ]. J Endod, 2008, 34 ( 4 ) : 456 - 458.
3Bonaccorso A, Cantatore G, Condorelli GG, et al. Shaping ability of four nickel-titanium rotary instruments in simulated S- shaped canals [J]. J Endod, 2009, 35 (6): 883 - 886.
4Ding-ming H, Hong-xia L, Cheung GS, et al. Study of the progressive changes in canal shape after using different in- struments by hand in simulated S-shaped canals [ J ]. J Endod, 2007, 33 (8) : 986 - 989.
5Yoshimine Y, Ono M, Akamine A. The shaping effects of three nickel-titanium rotary instruments in simulated S- shaped canals[J]. J Endod, 2005, 31(5) : 373 -375.
6Kim HC, Yum J, Hur B, et al. Cyclic fatigue and fracture characteristics of ground and twisted nickel-titanium rotary files[J]. J Endod, 2010, 36(1): 147 -152.
7Wyeoff RC, Berzins DW. An in vitro comparison of torsional stress properties of three different rotary nickel-titanium files with a similar cross-sectional design [ J ]. J Endod, 2012, 38(8): 1118-1120.