4Siqueira JF , Rjcas IN. Efficacy of instrumentation techniques and irrigation regimens in reducing the bacterial population within root canals[J].J Endod,2002,28(3) :181-184.
5Baumgartner C . Watkins B , Bae KS, et al. Association of BPB with endodontic infections [ J ]. J Endod, 1999.25 ( 6 ) :413 - 416.
6Siqueira JF, Lima KC,Magalheas F,et al.Mechanical reduction of the bacterial population in the root canal by three instrumentation techniques.[J] J Endod,1999, 25(5) :332-335.
7Langeland K,Liao K,Pascon EA.Work-saving devices in endodontics:efficacy of sonic and ultrasonic techniques[J].J Endod,1985,11(11) :499-510.
8Ahmad M,Pitt Ford TJ,CrumL A.Ultrasonic debridement of root canals:acoustic streaming and its possible role[J].J Endod,1987,13(10):490-499.
