2Dunlap CA,Re meikis NA,Be Gole 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.
3Boucher Y,Matossian L,Rilliard F,et al.Radiographic evaluation of the prevalence and technical quality of root cannal treatment in a French subpopulation[J].Int Endod J,2002,52:81-86.
