2Martine Z,Lozano MA,Fomer Navarro L,et al.Methodological considerations in the determination of working length[J].Int Endod J,2001,34(5):370-376.
3Dunlap CA.Remeikis NA,BeGole EA,et al.An in vivo evalution of an electionic apex locator that uses the ratio method jn vital and necrotic canals[J].J Endod,1998,24(1):48-50.
4Shabahang S,Goon Wwy,Gluskin AH,An in vivo evaluation of Root ZX electronic apex locator[J].J Endod,1996,22:616-618.
5Jose L.Effect of profaning on RootZX apex locators[J].J Endodon,1999,25:625.
6张举之.口腔内科学[M](第3版)[M].北京:人民卫生出版社,1995.108-111.
7Marfis A.Study of the apies of human permanent teeth with the use of a SEM[J].Oral Surge Oral Med Oral Pathol Oral Radial Endod,1994,77:122.
8Smith Cs,Setchell DJ.Factors influencing the success of conventional therapy a five year retrospective study[J].Int Endodntics J,1993,26:26.