Sotokawa T
Endod Dent Traumatol. 1990 Apr;6(2):60-2. doi: 10.1111/j.1600-9657.1990.tb00391.x.
This study was conducted to determine the effectiveness of a method to prevent intracanal breakage of endodontic files. An application schedule with a predetermined number of periods of use for K-files of all sizes was implemented at the author's clinic for a 3-year period. All the files used under this schedule were discarded after the predetermined periods of use, whether they displayed any deformity or not. During the 3-year period, 1933 files (53.7 per month) were discarded after preparation of 3269 root canals. There were 5 file fractures (0.1 per month) compared with 1.4 fractures per month before the adaptation of this system. The monthly average of files discarded during the 3-year research period was 53.7. Before the adoption of the trial system, the monthly average of discarded files was 76.5. It is concluded that the experimental system effectively reduced the incidence of intracanal instrument fractures and the total number of files consumed.
本研究旨在确定一种预防根管内牙髓锉折断方法的有效性。作者所在诊所实施了一个针对所有尺寸K锉的具有预定使用周期数量的应用计划，为期3年。在此计划下使用的所有锉，无论是否出现任何变形，在预定使用周期后均被丢弃。在这3年期间，在预备3269个根管后，有1933根锉（每月53.7根）被丢弃。与采用该系统之前每月1.4根锉折断相比，有5根锉发生折断（每月0.1根）。3年研究期间每月丢弃锉的平均数量为53.7根。在采用试验系统之前，每月丢弃锉的平均数量为76.5根。得出的结论是，该实验系统有效降低了根管内器械折断的发生率以及消耗锉的总数。
