4Dunlap CA,Remeikis N A, BeGole EA, et al. An in vivo evaluation of an electronic apex locator that uses the ratio method in vital and necrotic canals[J]. J Endodon, 1998,24( 1 ) :48 -50
6Thomas AS, Hartwell GR, Moon PC,The accuracy of the Root ZX electronic apex locator using stainless- steel and nickel - titanium files[J]. J Endod,2003,29(10) :662 - 663.
7王小仪.现代根管治疗学[M].北京:人民卫生出版社,2001.74.
8Dunlap CA,Remeikis NA,BeGole EA,et sl.An in vivo evaluation of an electronic apex locator that uses the ratio method in vital and necrotic canal [J].Endodon,1998,24(1):48-50.
9Ruddle CJ.ProTaper endodontic system:geometries.features,and guideline for use[J].Dent today,2001,20(10):60-67.
10Abou-Rass M,Jastrab RJ.The use of rotary instruments as auxiliary aids to root canal preparation of molars[J].J Endod.1982,8(2):78-82.