NiTi Alloy

# M-Wire

M-Wire is Dentsply Sirona's first-generation thermomechanically processed NiTi alloy. Unlike conventional NiTi that is entirely austenitic at body temperature, M-Wire contains a mixture of austenite and R-phase, which lowers elastic modulus and improves flexibility. This intermediate processing gives M-Wire approximately 400% greater cyclic fatigue resistance than conventional NiTi (manufacturer data). M-Wire files have a higher austenite finish temperature than Gold or Blue alloys, so at 37°C the alloy is predominantly in the austenite/R-phase mixture rather than the softer martensite phase. This provides a good balance of stiffness and flexibility for progressive multi-file rotary and single-file reciprocating techniques.

## Metallurgical Properties

Af Temperature43–50°C

Phase at 37°CAustenite + R-phase

FlexibilityModerate-High

Cyclic Fatigue~400% greater than conventional NiTi (manufacturer data)

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

## Systems Using M-Wire

[### ProTaper Next Dentsply Sirona Rotary M-Wire · variable (4-7%) · 6 files Progressive Efficiency](https://endo-guide.app/system/protaper-next)[### RECIPROC VDW GmbH Reciprocating M-Wire · variable (5-8%) · 3 files Original Single-File Reciprocation](https://endo-guide.app/system/reciproc)[### ProGlider Dentsply Sirona Rotary M-Wire · 2% (variable progressive) · 1 files Mechanical Glide Path in One File](https://endo-guide.app/system/proglider)

## Related Clinical Links

NiTi collections

[Glide Path Files](https://endo-guide.app/niti-files/glide-path-files)[Reciprocating Systems](https://endo-guide.app/niti-files/reciprocating-file-systems)[Rotary Systems](https://endo-guide.app/niti-files/rotary-file-systems)[Single-Use Systems](https://endo-guide.app/niti-files/single-use-niti-files)

Clinical use cases

[Severe Curvature](https://endo-guide.app/use-case/severe-curvature)[Calcified Canals](https://endo-guide.app/use-case/calcified-canals)

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/)

[Back to all systems](https://endo-guide.app/)

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