The torsional properties of conventionally twisted K-type endodontic files and recently developed machined K-type endodontic files were compared. File sizes 10 through 40 were subjected to torsional load in clockwise and counterclockwise directions independently. Results showed that a statistically significant reduction in clockwise rotation occurred at failure with all of the machined files except size 10. Counterclockwise rotation at failure was also significantly lower for the machined files in sizes 10 through 30. There was no difference in torsional strength between the file types regardless of rotation direction. Therefore, machined files exhibit less ductility than twisted files prior to fracture and may be more susceptible to torsional failure clinically.

译文

比较了常规扭曲的K型牙髓锉和最近开发的机加工的K型牙髓锉的扭转特性。大小为10至40的文件分别沿顺时针和逆时针方向承受扭转载荷。结果表明,除尺寸10外,所有机加工的锉刀在故障时均发生了统计学上显着的顺时针旋转减少。对于尺寸为10至30的机加工文件,故障时的逆时针旋转也明显降低。无论旋转方向如何,锉刀类型之间的扭转强度都没有差异。因此,机械加工的锉刀在断裂前表现出比扭曲的锉刀更小的延展性,并且在临床上可能更容易遭受扭转破坏。

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