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3Goldberg F, Marroquin BB, Frajlich S, Dreyer C. In vitro evaluation of the ability of three apex locators to determine the working length during retreatment[J].J Endod, 2005, 31 (9):676 - 678
4Kaufman AY, Keila S, Yoshpe M. Accuracy of a new apex lotator: an in vitro study [J]. Int Endod J, 2002, 35(2): 186 -192
5Wrbas KT, Ziegler AA, Altenburger M J, et al. In vivo comparison of working length determination with two electronic apex locatots [J]. Int Endod J, 2007, 40(2): 133 -138
