| 摘要 |
A reciprocating endodontic hand tool in which the torque applied to an instrument such as a debriding file does not exceed the elastic limit of the file. This reduces or eliminates opportunites for plastic distortion, fatigue and breakage of the file during the canal debriding/cleaning/shaping process. The rotational limits of the instrument may be set at levels that will not subject the instrument to a torque exceeding its elastic limit. |
