1Cheung GS. Survival of first-time nonsurgical root canal treatment performed in a dental teaching hospital [J]. Oral Surg Oral Med Oral Pathol Oral Radiod Endod ,2002 ,93 (5) :596-604
1Cheung GS.Survival of first-time nonsurgical root canal treatment performed in a dental teaching hospital[J].Oral Surg Oral Med Oral Pathol Oral Radiol Endod.2002,93 (5):596-604
2Lim KC,Webber J.The validity of simulated root canals for the investigation of the prepared root canal shape[J].Int Endod J,1985,18 (4):240-246
