1Weller RN, Niemczyk SP, Kim S. Incidence and position of the canal isthmus. Part 1. Mesiobuccal root of the maxillary first molar [J]. J Endod, 1995, 21(7):380-383
2Cambruzzi JV, Marshall FJ. Molar endodontie surgery [ J ]. J Can Dent Assoc, 1983, 49(1):61 -66
3Vertucci. Root canal anatomy of the human permanent teeth [J]. Oral Surg Oral Med Oral Pathol, 1984, 58(5):589 -599
5Hsu YY, kim S. The resected root surface. The issue of canal isthmuses [ J ]. Dent Clin North Am, 1997,41 ( 3 ) : 529 - 540
6Mannocci F, Peru M, Sherriff M, et al. The isthmuses of the mesial root of mandibular molars : a micro - computed tomographic study [J]. Int Endod J, 2005, 38(8):558-563
7von Arx T. Frequency and type of canal isthmuses in first molars detected by endoscopic inspection during periradicular surgery [J]. Int Endod J, 2005, 38(3): 160 -168
8Uma Ch, Ramachandran S, Indira R, et al . Canal and isthmus morphology in mandibular incisors - An in vitro study [J]. Endodontology, 2004, 16:7-11
10Tam A, Yu DC. Location of canal isthmus and accessory canals in the mesiobuccal root of maxillary first permanent molars [ J ]. J Can Dent Assoc, 2002, 68 ( 1 ) : 28 - 33
8Weller RN, Niemczyk SP,Kim S. Incidence and position of thecanal isthmus. Partl. Mesiobuccal root of the maxillary first molar. J Endod,1995,21:380 - 383.
9Kim S, Pecora G, Rubinstein RA. Color atlas of microsurgery in endodonties. WB Saunders Company, US,2001,105 - 114.
10Rubinstein RA,Kim S. Long-term follow-up of cases considered healed one year after apical microsurgery. J Endod, 2002,28:378 - 383.
9Taschieri S, Fabbro M, Testori T, et al. Endodontic surgery with ultrasonic retrotips : One-year follow- up [ J ]. Oral Surg Oral Med Oral Path Oral Radiol Endod, 2005,100 ( 3 ) : 380 - 387.
10Tsesis I, Rosen E, Schwartz-Arad D, et al. Retrospective evaluation of surgical endodontic treatment: Traditional versus modem technique [ J ]. J Endod ,2006,32 (5) :412 - 416.