NiTi Alloy

# EDM Process (Electrical Discharge Machining)

Electrical Discharge Machining (EDM) is a non-contact manufacturing process used by Coltene for HyFlex EDM files. Instead of grinding, EDM erodes the NiTi blank using controlled electrical discharges in a dielectric fluid. This process avoids the surface microcracks associated with conventional grinding and creates compressive residual stresses at the surface. The result is a dramatic improvement in cyclic fatigue resistance—Coltene reports 700% greater fatigue life compared to conventional CM-Wire manufacturing alone. EDM-manufactured files also exhibit controlled memory behavior, allowing pre-bending and passive canal following. An additional clinical benefit is the regeneration property: files that have been bent or deformed during use can often be returned to their original shape by autoclaving.

## Metallurgical Properties

Af Temperature~45–55°C

Phase at 37°CMartensite (controlled memory)

FlexibilityExtreme (pre-bendable, regenerative)

Cyclic Fatigue700% greater than conventional CM-Wire

[Compare all heat treatments→](https://endo-guide.app/alloy/heat-treatment-comparison)

## Related Clinical Links

Related alloys

[Gold Heat Treatment](https://endo-guide.app/alloy/gold)[Blue Heat Treatment](https://endo-guide.app/alloy/blue)[CM-Wire (Controlled Memory)](https://endo-guide.app/alloy/cm-wire)[C.Wire (Controlled Memory)](https://endo-guide.app/alloy/c-wire)

![Uzm. Dt. Levent Yüksel](https://endo-guide.app/images/levent-yuksel.jpg)

Reviewed by

Uzm. Dt. Levent Yüksel

DDS · Endodontist

Endodontist — DDS, Hacettepe University; endodontics specialty training, Ankara University. 10+ years of clinical experience. Sole author and reviewer of EndoGuide content.

[About the author](https://endo-guide.app/about)[Editorial policy](https://endo-guide.app/editorial-policy)[Clinical profile](https://drleventyuksel.com/)

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