# Mtwo®

> The Efficient NiTi System

- **Manufacturer:** VDW GmbH
- **Motion:** Continuous Rotation
- **Alloy:** Conventional NiTi
- **Key feature:** Simultaneous Shaping with S-shaped cross-section — all instruments to full working length in a single sequence

## Specifications

| File | Tip (mm) | Taper | Length | Cross-section | Motion | Speed (rpm) | Torque | Role |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 10/.04 | 0.10 | 4% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 1.2 Ncm | glide path |
| 15/.05 | 0.15 | 5% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 1.3 Ncm | glide path |
| 20/.06 | 0.20 | 6% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 2.1 Ncm | shaping |
| 25/.06 | 0.25 | 6% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 2.3 Ncm | shaping |
| 30/.05 | 0.30 | 5% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 1.2 Ncm | finishing (optional) |
| 35/.04 | 0.35 | 4% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 1.2 Ncm | finishing (optional) |
| 40/.04 | 0.40 | 4% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 1.6 Ncm | finishing (optional) |
| 45/.04 | 0.45 | 4% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 1.6 Ncm | finishing (optional) |
| 50/.04 | 0.50 | 4% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 2.0 Ncm | finishing (optional) |
| 60/.04 | 0.60 | 4% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 3.0 Ncm | finishing (optional) |
| 25/.07 | 0.25 | 7% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 2.0 Ncm | finishing (optional) |
| 30/.06 | 0.30 | 6% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 1.2 Ncm | finishing (optional) |
| 35/.06 | 0.35 | 6% | 21mm, 25mm, 31mm | S-shaped | Continuous Rotation | 280 | 1.0 Ncm | finishing (optional) |
| 40/.06 | 0.40 | 6% | 21mm, 25mm, 31mm | S-shaped (reduced) | Continuous Rotation | 280 | 1.7 Ncm | finishing (optional) |
| R15/.05 | 0.15 | 5% | 21mm | S-shaped | Continuous Rotation | 280 | 0.3 Ncm | retreatment (optional) |
| R25/.05 | 0.25 | 5% | 21mm | S-shaped | Continuous Rotation | 280 | 1.2 Ncm | retreatment (optional) |

## Protocol

### Glide Path

1. **Create Manual Glide Path** — Check canal patency and create a glide path to the apical constriction or foramen using C-PILOT files (ISO 06, 08, 10). Determine working length with an electronic apex locator.
   - Pre-curve hand files for curved canals
   - Establish patency to at least ISO #10 before using rotary files
   - Use chelating agent (EDTA) to facilitate progression
   - ⚠ Do not probe the pulp chamber floor with the Mtwo 10/.04
   - ⚠ Never force hand files apically
2. **Mtwo 10/.04 to Working Length** — Insert the rotating 10/.04 into the canal without touching the walls. Allow it to advance automatically using brushing movements. If resistance is felt, pull back 1-2 mm and use lateral brushing strokes on the canal walls to create space, then allow the file to progress again. Bring to full working length. _(File: 10/.04 · 280 RPM · 1.2 Ncm · Simultaneous Shaping (brushing))_
   - No apical pressure — let the instrument advance automatically
   - Clean flutes in the interim stand between passes
   - Use FileCare EDTA to facilitate progression
   - ⚠ Do not use in a picking movement
   - ⚠ Do not force the instrument to reach working length
   - ⚠ Bring the instrument to working length only once, then proceed to the next

### Shaping

1. **Mtwo 15/.05 and 20/.06 to Working Length** — Continue with 15/.05 then 20/.06, each to full working length using the same Simultaneous Shaping technique. Each instrument creates a glide path for the next. Irrigate between instruments. _(File: 15/.05, 20/.06 · 280 RPM · 1.3 / 2.1 Ncm · Simultaneous Shaping (brushing))_
   - If larger canals allow hand file #15 or #20 to WL easily, start Mtwo sequence at the corresponding size
   - Irrigate the root canal between each instrument change
   - Each Mtwo instrument enlarges the canal entrance progressively — no separate coronal flaring needed
   - ⚠ Monitor torque alarm signals — frequent alarms indicate excessive stress
   - ⚠ If instrument stalls, pull back and create space with brushing before re-advancing
2. **Mtwo 25/.06 to Working Length (Basic Sequence Completion)** — Complete the basic sequence with 25/.06 to full working length. This is the standard final preparation size for most canals. Gauge the foramen with an ISO #30 hand file: if snug at 1 mm short of WL, preparation is complete. _(File: 25/.06 · 280 RPM · 2.3 Ncm · Simultaneous Shaping (brushing))_
   - Apical gauging after 25/.06: insert ISO #30 hand file at WL
   - If hand file #30 is snug at WL minus 1 mm — canal is ready for obturation
   - If hand file #30 reaches full WL — further apical enlargement is needed
   - ⚠ Do not skip apical gauging — it determines if further shaping is needed

### Finishing

1. **Further Apical Enlargement (If Needed)** — If apical gauging indicates further enlargement is needed, continue with 30/.05, then 35/.04 if necessary, gauging with a hand file after each. For increased coronal taper, 25/.07, 30/.06, 35/.06, or 40/.06 are available. The canal can be prepared up to ISO 60 if needed. _(File: 30/.05, 35/.04, 40/.04 (or 25/.07, 30/.06, 35/.06, 40/.06) · 280 RPM · 1.0-2.0 Ncm (size-dependent) · Simultaneous Shaping (brushing))_
   - Reduced-taper files (30/.05, 35/.04, 40/.04) enlarge the apex without weakening the tooth coronally
   - Larger-taper files (25/.07, 30/.06, 35/.06, 40/.06) are available when more flare is desired
   - Verify preparation with wet vs dry debris test: red/wet debris = enlarge further; white/dry chips = target size reached
   - ⚠ Do not over-enlarge in thin roots
   - ⚠ Instruments with larger ISO sizes have a reduced cross-section for maintained flexibility
2. **Obturation** — Irrigate thoroughly with NaOCl and EDTA. Dry with matching Mtwo paper points. Obturate with Mtwo gutta-percha points (cold lateral) or GuttaFusion obturators (warm technique).
   - Mtwo matching gutta-percha and paper points available for all preparation sizes
   - GuttaFusion obturators (sizes 20-55) recommended for warm three-dimensional filling
   - Use GuttaFusion Size Verifiers before placing obturators

## Clinical Tips

- All files use 280 RPM (recommended; range 250-350 RPM per IFU). Torque is size-specific: 1.2 Ncm (10/.04), 1.3 Ncm (15/.05), 2.1 Ncm (20/.06), 2.3 Ncm (25/.06). VDW motors have pre-programmed Mtwo settings.
- Simultaneous Shaping means each file goes to full working length — no crown-down staging. This preserves tooth substance compared to coronal-first techniques.
- Brushing file movement: when resistance is felt, pull back 1-2 mm and stroke laterally against the canal wall (like a Hedstroem file), then allow the instrument to re-advance apically.
- No separate coronal flaring is needed — Mtwo's lateral cutting efficiency gradually widens the canal entrance with each file used.
- Apical gauging with ISO #30 hand file after the basic sequence determines if further enlargement is needed.
- Retreatment files R15/.05 (narrow canals, 0.3 Ncm) and R25/.05 (medium/wide canals, 1.2 Ncm) have active cutting tips for gutta-percha removal.
- Compatible with VDW.GOLD RECIPROC, VDW.SILVER RECIPROC, and VDW.CONNECT Drive motors (pre-programmed Mtwo settings available).

## Warnings

- Reusable sterile instrument per 2023 IFU — cleaned undamaged instruments validated for up to 8 processing cycles; silicone stops are single-use and must be replaced after each use
- VDW states it is safest to use Mtwo instruments only once — if reusing, document frequency with control stickers and inspect carefully
- Contains nickel — do not use on patients with known nickel allergy
- Do not use in root canals with abrupt apical curvatures — use pre-curved hand files instead (per IFU)
- Do not fully immerse in NaOCl — working part only, max 5% concentration (per IFU)
- Do not use in a picking movement — only brushing and automatic advancement
- Never force files apically — allow cutting action to progress naturally
- For extremely curved canals: consider single-canal use per file and visual inspection for deformation after every use (per IFU)
- Torque alarm signal indicates excessive stress — pull back, create space with brushing, then re-advance

## Best for

- Simultaneous Shaping to full WL
- all-in-one basic 4-file sequence
- wide range of apical finishing sizes

## Technical profile

- **Category:** multi-file-rotary
- **Heat treatment:** Conventional — Mtwo uses conventional NiTi without proprietary heat treatment. The alloy is austenitic at body temperature, providing superelastic behavior but without the pre-bendability of heat-treated systems.
- **Manufacturing method:** ground
- **Pre-bendable:** no
- **Reuse:** Reusable (limited)
- **Maximum reuse cycles:** 8
- **Motor:** any-rotary — VDW.GOLD RECIPROC, VDW.SILVER RECIPROC, VDW.CONNECT Drive (pre-programmed Mtwo settings)
- **Glide path requirement:** integrated — C-PILOT hand files (ISO 06-10) for manual glide path; Mtwo 10/.04 serves as the mechanized glide path instrument
- **Canal suitability:** Curvature: mild, moderate, severe; Canal size: narrow, normal, wide; Calcified canals: no; Retreatment: yes; Conservative access: no
- **Matching gutta-percha:** Mtwo Gutta-Percha (25/.06, 30/.05, 35/.04, 40/.04, 45/.04, 50/.04, 60/.04, 25/.07, 30/.06, 35/.06, 40/.06)
- **Matching paper points:** Mtwo Paper Points (25/.06, 30/.05, 35/.04, 40/.04, 45/.04, 50/.04, 60/.04, 25/.07, 30/.06, 35/.06, 40/.06)
- **Content revision:** 2026-03-22

## FAQ

**What alloy is Mtwo made from?**

Mtwo® is manufactured from Conventional NiTi.

**How many files are in the Mtwo sequence?**

The Mtwo® system includes 16 files: 10/.04, 15/.05, 20/.06, 25/.06, 30/.05, 35/.04, 40/.04, 45/.04, 50/.04, 60/.04, 25/.07, 30/.06, 35/.06, 40/.06, R15/.05, R25/.05.

**What motion type does Mtwo use?**

Mtwo® uses continuous rotation motion.

**What cases is Mtwo best for?**

Mtwo® is best suited for: Simultaneous Shaping to full WL, all-in-one basic 4-file sequence, wide range of apical finishing sizes.

**What speed and torque settings are recommended for Mtwo?**

Recommended settings: 280 RPM and 1.2 / 1.3 / 2.1 / 2.3 / 1.6 / 2.0 / 3.0 / 1.0 / 1.7 / 0.3 Ncm across the file sequence (refer to official DFU for full per-file parameters).

## References

- [Manufacturer instructions for use (DFU/IFU)](https://www.dentsplysirona.com/services/asset/download?path=/content/dam/master/product-procedure-brand-categories/endodontics/vdw/product-categories/preparation/mtwo/ifu/END-IFU-MTWO-REUSABLE-STERILE-VDW-V04-WEB-EUR-Multilingual-2025-12.pdf)

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