COLTENE HyFlex CM Files 4% 21MM

The files are extremely flexible but without the shape memory of conventional NiTi Files.
This gives the file the ability to follow the anatomy of the canal very closely, reducing the risk of ledging, transportation or perforation.
Furthermore the files can be pre-bent, similar to the way of stainless steel.
Particularly in root canals with abrupt curvatures this can help avoid the creation of steps.
Regains shape after heat treatment = Multi-use
HyFlex™ CM NiTi files respond to excessive resistance with straightening of the spirals, which avoids binding to the walls and therefore increases fracture resistance.
This form adaptation can be reversed quickly by heat treatment (during autoclaving or with a glass bead sterilizer) returning the instruments back to their original shape.
Furthermore it will strengthen the files making them a lot more resistant to cyclical fatigue.
Also it provides a clear visual opportunity to verify safe continuation of file use.