3Mohd Sulong MZA. The incidence of postoperative pain after canal preparation of open teeth using two irrigation regimes[J]. IntEndo J, 1989, 22:248
4Matusow R J, Mass C. The flare- up phenomenon in endodontics: A clinical perspective and review[J]. Oral Surg, 1988,65: 750
5Roane JB. Incidence of postoperative pain after single - and mul-tiple - visit endodontic procedures [J]. Oral Surg, 1983, 55: 68
6Shimauchi H, Miki Y, Takayama S, et al. Development of a quantitative sampling method for human root canals [J]. J Endod, 1996,22:612
7Wang CY, Stashenko P. Characterization of bone - resorbing activity in human periapical lesions[J]. J endod, 1993, 19:107
8Shimauchi H, Takayama S, Miki Y, et al. The change of periapical exudate prostaglandin E2 levels during root canal treatment[J]. JEndod, 1997, 23:755
9Takayama S, Miki Y, Shimauchi H, et al. Relationship between prostaglandin E2 concentrations in periapical exudates from root canals and clinical findings of periapical periodontitis [J]. J Endod, 1996,22(12): 677
