According to an embodiment of the present invention, provided is a file, which can be used for cleaning a root cap by using ultrasonic energy. The file according to an embodiment of the present invention is made of a Ni-Ti alloy and is heat-treated to include an R-phase at a temperature range of 36 to 45 deg. C.;COPYRIGHT KIPO 2019
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机译：根据本发明的实施例，提供了一种锉刀，该锉刀可用于通过使用超声波能量来清洁根冠。根据本发明的实施方式的锉刀由Ni-Ti合金制成并且在36至45度的温度范围内被热处理以包括R相。 C .;版权KIPO 2019
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