| 摘要 |
The invention concerns a dental instrument for performing root canal work. An end portion, integrally connected to the instrument shaft, is provided with four faces of like size, shape and orientation. The four faces are joined to one another by curved, continuous edges. Thus, the end portion has a square cross-section, provided so canal walls can be rasped at four points while leaving the walls of the canal smooth. Because the face edges meet at one point, a separate tip element is not necessary.
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