K files vs K flex files

This video describes the usage of Endodontic K files and also displays difference between k files and K flex files. K-Flex Files feature a unique rhomboid design, which provides a short axis for flexibility while maintaining cross-sectional strength. K flex files are more flexible than conventional “K” files of comparable size, particularly in sizes #30 and above, which facilitates the negotiation of curved canals and their preparation with minimal potential for ledging and perforating.

K flex type instruments are much more flexible than their K file equivalents. They are not useful in canal negotiation per se, especially in calcified canals, as they buckle far too easily when encountering resistance. Alternatively, if the canal has been scouted and has a minimal diameter, for example, the diameter of a #10 K Flex instruments can shape curved canals relatively efficiently. In general, this infers K flex files are used more for shaping curved canals that have already been negotiated to the apex and have some minimal size after initial negotiation. K files are useful for negotiation and initial canal shaping. They are relatively stiff, a useful attribute for the above indications. K flex type files are flexible and can shape curved canals efficiently, especially when creating a glide path.

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