# HyFlex® EDM

> Controlled Memory

- **Manufacturer:** Coltene
- **Motion:** Continuous Rotation
- **Alloy:** CM-Wire (EDM manufactured)
- **Key feature:** EDM + CM-Wire with regenerative memory — manufacturer reports enhanced fatigue resistance (bench data; figures vary by comparator and test setup)

## Specifications

| File | Tip (mm) | Taper | Length | Cross-section | Motion | Speed (rpm) | Torque | Role |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Orifice Opener | 0.18 | 11% | 18mm | Triangular | Continuous Rotation | 400 | 2.5 Ncm | — |
| GlidePath | 0.15 | 3% | 21mm, 25mm, 31mm | Square | Continuous Rotation | 300 | 1.8 Ncm | — |
| OneFile | 0.25 | Variable | 21mm, 25mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | — |
| Shaping | 0.18 | 4.5% | 21mm, 25mm, 31mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | — |
| Finishing | 0.30 | 4% | 21mm, 25mm, 31mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | — |
| 40/.04 | 0.40 | 4% | 21mm, 25mm, 31mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | finishing (optional) |
| 50/.03 | 0.50 | 3% | 21mm, 25mm, 31mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | finishing (optional) |
| 60/.02 | 0.60 | 2% | 21mm, 25mm, 31mm | Variable (quadratic tip, trapezoidal middle, triangular coronal) | Continuous Rotation | 400 | 2.5 Ncm | finishing (optional) |

## Protocol

### Glide Path

1. **Establish Access** — After straight-line coronal access, use hand file (max size 20/.02) or rotary glidepath file to establish apical glide path. Place irrigant (NaOCl) in canal.
   - Ensure root canal always remains irrigated and lubricated
   - Check patency using hand file after each step
2. **Coronal Opening** — Use Orifice Opener (18/11) to create coronal access. Place file in canal without running engine. Move back 1mm until free of walls, then start engine. Proceed forward slowly using tapping movements without pressure. _(File: Orifice Opener (18/11) · 400 RPM · 2.5 Ncm)_
   - Do not use this file in the curved part of the root canal
   - Proceed to next step as soon as resistance is felt
3. **Create Glide Path** — Use GlidePath File (15/.03) to working length. Place file in canal without running engine. Move back 1mm until free, then start engine. Proceed forward slowly using tapping movements. _(File: GlidePath (15/.03) · 300 RPM · 1.8 Ncm)_
   - This file is extremely thin - use very carefully
   - Not as breakage resistant as other HyFlex EDM files
   - ⚠ Use more carefully and less often than other files

### Shaping

1. **Shaping File** — Use Shaping File (18/.045) for enlargement to working length. Place file in canal without running engine. Move back 1mm until free, then start engine. Proceed forward slowly using tapping movements without pressure. _(File: Shaping (18/.045) · 400 RPM · 2.5 Ncm)_
   - Return to previous step as soon as resistance is felt
   - Clean spirals after every insertion

### Finishing

1. **Finishing File** — Use Finishing File (30/.04) for final enlargement to working length. Same technique - place without engine, move back 1mm, start engine, proceed with tapping movements. _(File: Finishing (30/.04) · 400 RPM · 2.5 Ncm)_
   - Check patency using hand file
   - Ensure canal remains irrigated and lubricated
2. **Verify Preparation** — Verify preparation is complete. Proceed with irrigation and obturation.
   - Verify tug-back with master cone
   - Reprocessing note: files may be reused if only elastically deformed — shape regenerates during autoclaving (per IFU). No fixed maximum cycle count; condition depends on processing and treatment. Inspect before and after each use.
   - If spirals appear lengthened after autoclaving, discard file

## Clinical Tips

- EDM manufacturing creates compressive surface stresses for superior fatigue resistance
- CM-Wire allows pre-bending that persists during use
- Spirals may lengthen in response to force - prevents binding and reduces breakage risk
- Shape regenerates during autoclaving (or 10 sec in glass bead sterilizer) if elastically deformed
- Files supplied pre-sterilized via gamma irradiation

## Warnings

- Ensure spirals do not wind in opposite direction during use - causes plastic deformation
- If spirals appear lengthened after autoclaving, discard file
- Inspect for unwinding before each use
- Do not use after expiration date
- Discard if any visible defects observed

## Best for

- extreme curvatures
- fatigue resistance priority
- reusable with regeneration

## Technical profile

- **Category:** multi-file-rotary
- **Heat treatment:** CM-Wire — CM-Wire with EDM manufacturing for controlled memory
- **Manufacturing method:** edm
- **Pre-bendable:** yes
- **Reuse:** Reusable (limited)
- **Motor:** any-rotary
- **Glide path requirement:** mechanical-recommended
- **Canal suitability:** Curvature: mild, moderate, severe; Canal size: narrow, normal, wide; Calcified canals: no; Retreatment: no; Conservative access: no
- **Matching gutta-percha:** COLTENE HyFlex EDM Guttapercha Points (.05 #20, OneFile #25, .04 #40, .03 #50, .02 #60, OGSF 30/.04)
- **Matching paper points:** COLTENE HyFlex EDM Paper Points (.05 #20, .04 #40, .03 #50, .02 #60)
- **Content revision:** 2026-02-15

## FAQ

**What alloy is HyFlex EDM made from?**

HyFlex® EDM is manufactured from CM-Wire (EDM manufactured).

**How many files are in the HyFlex EDM sequence?**

The HyFlex® EDM system includes 8 files: Orifice Opener, GlidePath, OneFile, Shaping, Finishing, 40/.04, 50/.03, 60/.02.

**What is the HyFlex EDM file sequence?**

HyFlex® EDM is used in this order: Orifice Opener → GlidePath → OneFile → Shaping → Finishing → 40/.04 → 50/.03 → 60/.02. Per-file speed, torque and technique are in the protocol section above.

**What motion type does HyFlex EDM use?**

HyFlex® EDM uses continuous rotation motion.

**What cases is HyFlex EDM best for?**

HyFlex® EDM is best suited for: extreme curvatures, fatigue resistance priority, reusable with regeneration.

**What speed and torque settings are recommended for HyFlex EDM?**

Recommended settings: 400–300 RPM and 2.5 / 1.8 Ncm across the file sequence (refer to official DFU for full per-file parameters).

## References

- [Manufacturer instructions for use (DFU/IFU)](https://media.coltene.com/DE/DE/media/DOC_IFU_30005847-03-23-IFU-HyFlex-EDM-OGSF-Reg_IND.pdf?sprache=EN)
- [PubMed 31118530](https://pubmed.ncbi.nlm.nih.gov/31118530/)
- [PubMed 29142876](https://pubmed.ncbi.nlm.nih.gov/29142876/)
- [PubMed 33371244](https://pubmed.ncbi.nlm.nih.gov/33371244/)
- [PubMed 34367289](https://pubmed.ncbi.nlm.nih.gov/34367289/)
- [PubMed 31857861](https://pubmed.ncbi.nlm.nih.gov/31857861/)

## Related

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_Educational reference for dental professionals. Always confirm settings against the official manufacturer instructions for use before clinical procedures._