K-file: Design & Structure

K-files are manufactured from square or sometimes triangular steel wire that is twisted to give the typical shape of a K-file. The angle between the long-axis and the cutting blade is greater than in a reamer, and therefore preparation by a K-file is effective both in rotary and filing motion.

The tip of the instrument is cutting which makes the K-file best suited for the preparation of straight canals. Small K-files (ISO 06 - 15) can be also used in curved canals without the risk of ledging. Small K-files are particularly good for the initial preparation of very narrow canals.

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