# K One™

> Pediatric Single-File for Primary Teeth

- **Manufacturer:** Perfect Dental (Shenzhen Perfect Medical Instruments)
- **Motion:** Continuous Rotation
- **Alloy:** NiTi
- **Key feature:** 15 mm single rotary file (25/.06) with a brochure-described "special tip design" intended to avoid irritation and damage to the periapical tissue of primary teeth (per brochure)

## Specifications

| File | Tip (mm) | Taper | Length | Cross-section | Motion | Speed (rpm) | Torque | Role |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| K One 25/.06 | 0.25 | 6% | 15mm | Spiral-shaped tip end on a single blade (per brochure description) | Continuous Rotation | 250-350 | 1.5-3.0 Ncm | shaping |

## Protocol

### Glide Path

1. **Scout Primary Canal with Hand File** — Use a small hand K-file (ISO #10 or #15) to scout the primary tooth canal to working length. Pediatric root canal anatomy is typically wider apically with thinner walls, so apply minimal pressure (per pediatric endodontic practice).
   - Working length for primary teeth is generally established 1–2 mm short of radiographic apex due to physiologic resorption (general pediatric guidance, not from brochure)
   - K One is supplied in a 15 mm shaft, matched to typical primary-tooth canal length (per brochure)

### Shaping

1. **K One Rotary Preparation** — Use the K One 25/.06 single file at 250–350 rpm with torque set between 1.5–3.0 N·cm (per brochure spec table). Advance with gentle apical pressure following the established glide path until the working length is reached. The 15 mm shaft is intended to keep the file from over-extending in deciduous canals (per brochure). _(File: K One 25/.06 · 250–350 rpm · 1.5–3.0 N·cm · Continuous rotation)_
   - Brochure-described "special tip design" is intended to avoid irritation and damage to the periapical tissue of primary teeth (per brochure — brochure does not explicitly use the term "non-cutting")
   - Short 15 mm shaft is described as helping avoid accidental shortening of the file and the risk of the child ingesting or inhaling it (per brochure)
   - Irrigate frequently with an appropriate pediatric-compatible irrigant; do not fully immerse the file in NaOCl (per Perfect Dental IFU family precautions)
   - ⚠ Single-use only; discard after each canal (per IFU family precautions)

### Finishing

1. **Confirm Shape and Obturate** — Confirm the final canal shape with a matching ISO 25 hand file, irrigate, dry, and obturate with a pediatric-appropriate resorbable material per local protocol (general pediatric guidance, not from brochure).
   - Choose obturation material compatible with primary-tooth physiologic resorption (e.g. ZOE-based or iodoform-based pastes per institutional protocol)

## Clinical Tips

- Single 25/.06 file at 15 mm length is intended to match the deciduous-tooth canal length and width (per brochure)
- Brochure describes a "special tip design" to avoid periapical irritation and damage in primary teeth; the brochure does not explicitly use the term "non-cutting"
- Spec table: 1.5–3.0 N·cm torque and 250–350 rpm; sterilization ≤134 °C; supplied 4 pcs per box/blister (per brochure features and spec tables)
- Pediatric anatomy varies widely; verify working length radiographically and respect physiologic apex location (general pediatric guidance, not from brochure)
- Pulpectomy in primary teeth typically aims for clean and shape with minimal apical extension; over-instrumentation may damage the permanent tooth bud (general pediatric guidance, not from brochure)

## Warnings

- Brochure features table specifies a maximum sterilization temperature of 134 °C (per brochure)
- Brochure body does not explicitly state "single-use"; the Perfect Dental IFU family (RC, TS4, PX Wave, TF4, TG6) consistently mandates single-use, single-canal handling, so single-use is treated as the default Perfect Dental policy until an IFU specific to K One is published
- Do not fully immerse in NaOCl; the IFU family limits contact to max 5% NaCl on the working part for up to 5 minutes (per Perfect Dental IFU family precautions)
- Safety in pregnant or breastfeeding patients has not been established (per Perfect Dental IFU family precautions)
- Inspect for deformation, unwinding, corrosion, or damaged edges before use — discard if any defect is present (per Perfect Dental IFU family precautions)

## Contraindications

- permanent teeth with full-length canals (15 mm shaft too short)
- patients with known nickel allergy (per IFU)

## Best for

- primary-tooth pulpectomy
- short pediatric canals
- single-file pediatric workflow

## Technical profile

- **Category:** pedodontic
- **Heat treatment:** Conventional
- **Manufacturing method:** ground
- **Pre-bendable:** no
- **Reuse:** Single-use
- **Motor:** any-rotary
- **Glide path requirement:** manual-only
- **Canal suitability:** Curvature: mild, moderate; Canal size: narrow, normal, wide; Calcified canals: no; Retreatment: no; Conservative access: yes
- **Content revision:** 2026-05-16

## FAQ

**What alloy is K One made from?**

K One™ is manufactured from NiTi with conventional heat treatment.

**How many files are in the K One sequence?**

The K One™ system includes 1 file: K One 25/.06.

**What motion type does K One use?**

K One™ uses continuous rotation motion.

**What cases is K One best for?**

K One™ is best suited for: primary-tooth pulpectomy, short pediatric canals, single-file pediatric workflow.

**What speed and torque settings are recommended for K One?**

Recommended settings: 250-350 RPM and 1.5-3.0 Ncm across the file sequence (refer to official DFU for full per-file parameters).

## Related

- [HTML page](https://endo-guide.app/system/perfect-k-one)
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_Educational reference for dental professionals. Always confirm settings against the official manufacturer instructions for use before clinical procedures._