6Pickenpaugh L,Reader A,Beck M,et al.Effect of Prophylactic Amoxicillin on Endodontic Flare-Up in Asymptomatic,Necrotic Teeth[J].Journal of Endodontics,2001,27(1):53-56
8Weller 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
9Cambruzzi JV, Marshall FJ. Molar endodontie surgery [ J ]. J Can Dent Assoc, 1983, 49(1):61 -66
10Vertucci. Root canal anatomy of the human permanent teeth [J]. Oral Surg Oral Med Oral Pathol, 1984, 58(5):589 -599