# TF4™

> Rotary + Reciprocating Hybrid Sequence

- **Manufacturer:** Perfect Dental (Shenzhen Perfect Medical Instruments)
- **Motion:** Continuous Rotation
- **Alloy:** NiTi
- **Key feature:** Four-file hybrid sequence (T20 20/.07, T25 25/.07, T35 35/.06, T45 45/.05) where T25 25/.07 is run in reciprocating motion within an otherwise rotary workflow at 350 rpm / 2.0–3.0 N·cm (per IFU spec table and step-by-step)

## Specifications

| File | Tip (mm) | Taper | Length | Cross-section | Motion | Speed (rpm) | Torque | Role |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| T20 20/.07 | 0.20 | 7% | 21mm, 25mm, 31mm | Not specified by name in IFU text | Continuous Rotation | 350 | 2.0-3.0 Ncm | shaping |
| T25 25/.07 (reciprocating) | 0.25 | 7% | 21mm, 25mm, 31mm | Not specified by name in IFU text | Reciprocating | 350 | 2.0-3.0 Ncm | shaping |
| T35 35/.06 | 0.35 | 6% | 21mm, 25mm, 31mm | Not specified by name in IFU text | Continuous Rotation | 350 | 2.0-3.0 Ncm | finishing |
| T45 45/.05 | 0.45 | 5% | 21mm, 25mm, 31mm | Not specified by name in IFU text | Continuous Rotation | 350 | 2.0-3.0 Ncm | finishing |

## Protocol

### Glide Path

1. **Hand-File Scout** — Use ISO 010 or ISO 015 K-file to advance with slight 2–3 mm thrusts and reach working length one or more times. Irrigate thoroughly with sodium hypochlorite (per IFU step 3).
2. **Expand Glide Path with ISO 015** — Continue with the ISO 015 K-file to expand the canal channel and reconfirm working length and canal condition (per IFU step 4).

### Shaping

1. **Reciprocating Step with T25 25/.07** — Configure a dedicated motor setting and use the 025/.07 file in reciprocating motion until working length is reached. When the tip of the file is covered with dentin, the canal channel preparation is considered complete (per IFU step 5–6). _(File: T25 25/.07 · 350 rpm · 2.0-3.0 N·cm · Reciprocating)_
   - Dentin coverage on the file tip is the IFU-defined completion criterion for this step (per IFU step 6)
   - ⚠ Do not force the file — clean, irrigate, and recapitulate if progress stops (per IFU precautions)
2. **Adjust If Resistance or Looseness** — If resistance is encountered during shaping, replace with T20 20/.07 to continue preparation. If the canal is loose or apical dentin is sparse, switch to T35 35/.06 or T45 45/.05 to refine the final shape (per IFU step 7). _(350 rpm · 2.0-3.0 N·cm)_
   - Resistance → step down to T20 20/.07 (per IFU)
   - Loose canal / sparse apical dentin → step up to T35 or T45 (per IFU)

### Finishing

1. **Confirm Working Length** — Confirm working length and canal condition before obturation (per IFU step-by-step).

## Clinical Tips

- Brochure-style IFU (File No. TF4-SM-001 family) — TF4 has its own IFU body with step-by-step instructions
- Verified spec table: T20 20/.07, T25 25/.07, T35 35/.06, T45 45/.05 — all at 350 rpm and 2.0–3.0 N·cm (per IFU spec table)
- Hybrid kinematics: IFU step 5 explicitly places T25 25/.07 in reciprocating motion; IFU step 7 lists T20 (resistance) and T35/T45 (loose canal) as substitutes for T25 — the motion type for these substitutes is not explicitly stated, but is implied to inherit T25's reciprocating step
- Switch logic is explicitly defined: tighten → T20, loosen → T35/T45 (per IFU step 7)
- The .07 tapers in T20/T25 are aggressive — verify motor torque headroom and avoid binding (general guidance)

## Warnings

- Single-use; discard after each canal (per IFU section 3)
- Do not autoclave above 200 °C including drying phase (per IFU precautions)
- Do not fully immerse in NaOCl; only the working part may contact a max 5% NaCl solution for up to 5 minutes (per IFU section 4)
- Inspect each file for distortion, unwinding, corrosion, or damaged edges before use (per IFU section 4)
- Use minimal apical pressure; never force the file (per IFU section 4)
- Contraindicated in patients with nickel allergy (per IFU section 1)

## Contraindications

- patients with known nickel allergy (per IFU)

## Best for

- rotary + reciprocating hybrid workflow
- clinicians comfortable switching motor modes mid-case
- moderate-curvature anatomy

## Technical profile

- **Category:** hybrid
- **Heat treatment:** Conventional
- **Manufacturing method:** ground
- **Pre-bendable:** no
- **Reuse:** Single-use
- **Motor:** specific-motor — Endo motor supporting both rotary and reciprocating modes (T25 25/.07 step is reciprocating per IFU)
- **Glide path requirement:** manual-only
- **Canal suitability:** Curvature: mild, moderate; Canal size: narrow, normal, wide; Calcified canals: no; Retreatment: no; Conservative access: no
- **Content revision:** 2026-05-16

## FAQ

**What alloy is TF4 made from?**

TF4™ is manufactured from NiTi with conventional heat treatment.

**How many files are in the TF4 sequence?**

The TF4™ system includes 4 files: T20 20/.07, T25 25/.07 (reciprocating), T35 35/.06, T45 45/.05.

**What is the TF4 file sequence?**

TF4™ is used in this order: T20 20/.07 → T25 25/.07 (reciprocating) → T35 35/.06 → T45 45/.05. Per-file speed, torque and technique are in the protocol section above.

**What motion type does TF4 use?**

TF4™ uses continuous rotation motion.

**What cases is TF4 best for?**

TF4™ is best suited for: rotary + reciprocating hybrid workflow, clinicians comfortable switching motor modes mid-case, moderate-curvature anatomy.

**What speed and torque settings are recommended for TF4?**

Recommended settings: 350 RPM and 2.0-3.0 Ncm across the file sequence (refer to official DFU for full per-file parameters).

## Related

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