TY - JOUR AU - Song, Y L; Bian, Z; Fan, B; Fan, M W; Gutmann, J L; Peng, B TI - A comparison of instrument-centering ability within the root canal for three contemporary instrumentation techniques JO - Int Endod J VL - 37 PY - 2004 DO - 10.1111/j.0143-2885.2004.00798.x L3 - PubMed-ID: 15056353 SP - 265 EP - 71 ER -