| 摘要 |
The invention relates to a root canal instrument (1), comprising a metallic needle part (3) for working the tooth and a gripping end (2) attached to the upper end of the needle part to serve as a handle. The outer surface of the gripping end (2) is substantially continuous, the coefficient of friction of the material used in the outer surface of the gripping end is higher than the coefficient of friction of the material typically used in gripping ends of root canal instruments made of metal, polyphenylene sulfide or a similar material, and the hardness of at least the material used in the outer surface of the gripping end as well as the thickness of the material layer are so chosen that the shape of the gripping end (2) is recoverably deformable between the fingers of the person performing the root treatment. |
