Double Screw Threads Guide
Double screw threads — also called Multi Thread or double-helix PDO threads — are formed from two parallel coils wound together inside one needle. The dual-coil structure nearly doubles the surface area of a single screw thread, creating firmer tissue compression, a stronger collagen scaffold, and a more sustained volume effect. For the full thread type comparison, see our PDO Threads: The Complete Guide.
On this page:
- What are double screw threads?
- Double vs. single screw — side-by-side comparison
- Multi Thread — gauges & specifications
- Best treatment areas
- Placement technique overview
- Can double screw threads replace hyaluronic acid?
- Wholesale & OEM supply
- Frequently asked questions
What Are Double Screw Threads?
Double screw threads are PDO monofilament threads wound into two parallel spirals (a double helix). The interlocking dual-coil structure operates on the same principle as a single screw — tissue compression and collagen biostimulation — but with approximately twice the surface-area contact and proportionally stronger mechanical support. Like all PDO, they absorb in 3-6 months; the volume effect typically lasts 9–12 months, with the collagen scaffold persisting beyond absorption.
Double vs. Single Screw — Side-by-Side Comparison
| Feature | Single Screw | Double Screw (Multi Thread) |
|---|---|---|
| Structure | One spiral strand | Two interlocking spirals |
| Surface area | Standard | ~2× (more collagen scaffold) |
| Volume support | Mild–moderate | Moderate–strong |
| Collagen response | Standard | Higher (more thread surface) |
| Needle type | Sharp or blunt | Semi-blunt (Multi Thread) — less bleeding/pain |
| Typical gauge | 26G–27G | 21G–23G |
| Best for | Moderate folds, general volume | Pronounced volume depression, deep folds |
Placement Technique Overview
Educational only — practitioners must follow training and product IFU.
- Depth: subcutaneous plane (below dermis, above fascia). Semi-blunt needles allow safer navigation through tissue layers.
- Thread count: typically 2–4 threads per fold for nasolabial treatment; 1–2 per zone for forehead and glabella.
- Session planning: initial round, then top-up at 6–9 months if needed. Avoid over-correction in the first session.
- Combination protocol: Multi Thread (volume) + Mono threads (skin quality) + Cog threads (structural lift) in a single session addresses all three clinical layers.
Can Double Screw Threads Replace Hyaluronic Acid?
The Multi Thread design is specifically described as a replacement option for large/medium-molecule hyaluronic acid in deep facial depressions. The key distinctions:
| Factor | Multi Thread (Double Screw) | HA Filler |
|---|---|---|
| Mechanism | Collagen biostimulation + mechanical support | Immediate volumisation (hydroscopic gel) |
| Onset | Progressive (8–12 weeks peak) | Immediate |
| Duration | 9–12 months collagen scaffold | 6–18 months (gel-dependent) |
| Reversibility | Not reversible (absorbable but no hyaluronidase) | Reversible with hyaluronidase |
| Best suited for | Patients preferring a natural, progressive result; HA-contraindicated patients | Immediate result needed; precise volumisation |
Double screw threads are not a direct substitute in all cases — the choice depends on patient preference, laxity severity, and practitioner assessment. They are an increasingly popular alternative for patients who want natural-looking results without gel filler.
Wholesale & OEM Supply
AuroThread manufactures the Multi Thread range under ISO 13485 QMS, CE-certified. Factory-direct wholesale pricing and OEM customization available.
| Supply Option | Details |
|---|---|
| Material options | PDO (standard) · PCL (longer duration) · PLLA (extended collagen) |
| OEM / Private Label | Custom packaging, branding, and labeling available |
| Free Sample | Available for qualified wholesale buyers on request |
This guide is educational and not medical advice; double screw thread placement must be performed by licensed practitioners.
Frequently Asked Questions
What is the difference between single and double screw threads?
Double screw threads have two interlocking spirals — approximately twice the surface area — providing stronger volume support for pronounced depressions like deep nasolabial folds, glabella, and marionette lines. The AuroThread Multi Thread also uses semi-blunt needles that reduce bleeding, pain, and post-procedure swelling compared to sharp single screw alternatives.
How long do double screw thread results last?
Typically 9–12 months. PDO absorbs in ~3-6 months; the stronger double-helix collagen scaffold helps maintain volume support beyond absorption. PCL material extends the duration further.
Can double screw threads replace hyaluronic acid filler?
The Multi Thread is designed for the same deep facial depressions where large/medium-molecule HA fillers are used. The key difference: threads produce progressive collagen-based results (onset 8–12 weeks) while HA provides immediate volumisation. They are not universally interchangeable — practitioner assessment determines the best approach for each patient.
Can I buy double screw threads wholesale?
Yes — Multi Thread is available at factory-direct wholesale pricing, with OEM options in PDO, PCL, and PLLA. See the full PDO collection or contact our wholesale team.
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Educational content only — not medical advice. Results vary by individual. © 2026 Auro Technology Limited.