ZenFlex™
Kerr Dental
ZenFlex™
Kerr Dental
Violet oxide surface with 1mm flute diameter for minimally invasive shaping and excellent flexibility
Continuous Rotation · Heat-Treated NiTi (Controlled Memory)
- RPM
- Ncm1–3.5
- File
- 10
- Verified
Specifications
Tap icons for term definitions
| File | Tip | Taper | SpeedRPM | TorqueNcm | Role |
|---|---|---|---|---|---|
Diameter at the file tip (D0). Larger tips shape wider canals. | |||||
How much the file widens per mm. Higher taper = more aggressive cutting. | |||||
Rotational speed (RPM). Follow manufacturer settings to prevent file breakage. | |||||
Rotational force limit (Ncm). Prevents file fracture by auto-reversing when resistance is too high. | |||||
20/.04yellow | 0.20 | 4% | 500 | 1.00 | Shaping |
25/.04red | 0.25 | 4% | 500 | 1.00 | Shaping |
30/.04blue | 0.30 | 4% | 500 | 3.0 | Finishing |
35/.04green | 0.35 | 4% | 500 | 3.0 | Finishing |
40/.04black | 0.40 | 4% | 500 | 3.0 | Finishing |
20/.06yellow | 0.20 | 6% | 500 | 2.0 | Shaping |
25/.06red | 0.25 | 6% | 500 | 2.0 | Shaping |
30/.06blue | 0.30 | 6% | 500 | 3.5 | Finishing |
35/.06green | 0.35 | 6% | 500 | 3.5 | Finishing |
40/.06black | 0.40 | 6% | 500 | 3.5 | Finishing |
Matching gutta-percha & paper points
- Gutta-percha
- ZenFlex Gutta-Percha20/.04, 25/.04, 30/.04, 20/.06, 25/.06, 30/.06
- Paper points
- ZenFlex Paper Points20/.04, 25/.04, 30/.04, 20/.06, 25/.06, 30/.06
Clinical Tips
- All files use 500 RPM; torque varies by taper and size
- Controlled-memory alloy provides excellent flexibility without shape memory spring-back
- Violet titanium oxide surface layer is characteristic of the heat treatment
- 1mm maximum flute diameter for minimally invasive shaping — Kerr states it is 20% smaller than Vortex Blue (manufacturer data)
- Can also be used in Adaptive Motion on Kerr elements e-motion motor
- Available in 21mm, 25mm, and 31mm lengths for all sizes
- Must be cleaned and sterilized before first use (non-sterile out of box)
- Assorted packs available: .04 Asst (20-45) and .06 Asst (20-45)
Warnings
- Single-use only — do not reuse, risk of cross-contamination and breakage
- Contains nickel, brass, and titanium — do not use on patients with sensitivity
- Must be sterilized before first use: autoclave 132°C/4 min pre-vacuum or 121°C/30 min gravity
- Do NOT sterilize in chemical sterilization unit (causes corrosion)
- Exercise additional caution in canals with severe or sudden apical curvatures due to heightened separation risk
- Inspect for deformation, breakage, fractures, or corrosion before use
- Use rubber dam to avoid accidental aspiration or ingestion
Obturation Techniques
Single cone, warm vertical, carrier-based & lateral compaction
Protocol
01Glide Path2
02Shaping3
03Finishing2
Related Systems
From Kerr Dental Systems
Manufacturer page
Kerr Dental SystemsOther continuous rotation systems
Motion category
Continuous RotationComparisons
Clinical guides
Frequently Asked Questions
What alloy is ZenFlex made from?
What alloy is ZenFlex made from?
Answer
ZenFlex™ is manufactured from Heat-Treated NiTi (Controlled Memory).
How many files are in the ZenFlex sequence?
How many files are in the ZenFlex sequence?
Answer
The ZenFlex™ system includes 10 files: 20/.04, 25/.04, 30/.04, 35/.04, 40/.04, 20/.06, 25/.06, 30/.06, 35/.06, 40/.06.
What is the ZenFlex file sequence?
What is the ZenFlex file sequence?
Answer
ZenFlex™ is used in this order: 20/.04 → 25/.04 → 20/.06 → 25/.06 → 30/.04 → 35/.04 → 40/.04 → 30/.06 → 35/.06 → 40/.06.
- Per-file speed, torque and technique are in the protocol section above.
What motion type does ZenFlex use?
What motion type does ZenFlex use?
Answer
ZenFlex™ uses continuous rotation motion.
What cases is ZenFlex best for?
What cases is ZenFlex best for?
Answer
ZenFlex™ is best suited for: minimally invasive shaping, controlled-memory flexibility, dual taper strategy (.04/.06).
What speed and torque settings are recommended for ZenFlex?
What speed and torque settings are recommended for ZenFlex?
Answer
Recommended settings: 500 RPM and 1.00 / 3.0 / 2.0 / 3.5 Ncm across the file sequence (refer to official DFU for full per-file parameters).
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.
Cite this page
Citation formats for the manufacturer-verified specification data on this page.
AMA
Yüksel L. ZenFlex: sequence, speed and torque settings. EndoGuide. Updated: 2026-10-03. https://endo-guide.app/system/zenflex
BibTeX
@misc{endoguide-zenflex,
author = {Yüksel, Levent},
title = {ZenFlex: sequence, speed and torque settings},
howpublished = {\url{https://endo-guide.app/system/zenflex}},
year = {2026},
note = {EndoGuide. Updated: 2026-10-03}
}Powered by:Uzm. Dt. Levent Yüksel
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