4Reddy SA, Hicks ML. Apical extrusion of debris using two hand and rotary instrumentation techniques[J]. J Endod, 1998, 24(3) : 108-113.
5Basmadjian-Charles el, Farge P, Bourgeois DM, et al. Factors inflencing helong-term results of endodontic treatment., a review of the literature[J]. Int Dent, 2002 : 81- 86.
6Boucher Y, Matossian L, Rilliard F, et al. Radiographic evaluation of the prevalence and technical quality of root canal treatment in a French subpopulation [J]. Int Endod J, 2002 : 81-86.
