Friedman S, Rotstein I, Shar-Lev S
J Endod. 1989 Sep;15(9):432-7. doi: 10.1016/S0099-2399(89)80178-5.
Endodontic retreatment using Canal Finder K files and chloroform was performed in 106 gutta-percha-obturated, curved root canals, 71 in vitro and 35 in vivo. The minimum time taken to bypass the obturation in a single root canal was 3 s and the maximum time 95 s. The mean times were 19 and 27 s in the two in vitro groups and 32 s in the in vivo group. Eighty-nine percent of the root canals which had been obturated short were bypassed apically in vivo. Root canal curvature was well maintained in all but two root canals. In these two cases apical transportation occurred. Breakage of files occurred three times in vitro, but this did not prevent the completion of bypassing with new files. These results are attributed to the mode of action of the Canal Finder system, which makes it an efficient root canal pathfinder. The advantages of the suggested technique are discussed in light of the clinical considerations of endodontic retreatment.
使用根管探查K锉和氯仿对106个牙胶尖充填的弯曲根管进行根管再治疗，其中71个在体外，35个在体内。在单个根管中绕过充填物所需的最短时间为3秒，最长时间为95秒。两个体外组的平均时间分别为19秒和27秒，体内组为32秒。在体内，89%充填过短的根管在根尖部被绕过。除两个根管外，所有根管的根管弯曲度均保持良好。在这两个病例中发生了根尖移位。锉在体外折断了三次，但这并未妨碍用新锉完成绕过操作。这些结果归因于根管探查系统的作用方式，这使其成为一种有效的根管探路器。根据根管再治疗的临床考虑因素，讨论了所建议技术的优点。
