Thread Lift Types: PDO, PLLA, PCL and COG Threads 2026

Comparison of the Three Main Polymers

Smooth (Mono) vs Barbed (COG) Thread Differences

Thread structure determines the mechanism of action:

• Smooth (Mono) threads: Straight, superficial threads with no barbs. They create a collagen-stimulating mesh within the skin. Mechanical lifting force is low. Used for skin quality improvement, fine wrinkle treatment and collagen support as an adjunct to mesotherapy.
• Barbed (COG/Barbed) threads: Small hooks (cogs) on the thread surface grip the tissue and create mechanical lifting force. This is the primary thread type chosen for facial lifting. They also provide collagen stimulation.

Special Thread Types and Geometries

Numerous specialised thread geometries are available on the market:

• Screw/Twister thread: Helical structure for superficial skin tightening and moisture retention.
• Tornado thread: Multiple spirals for stronger collagen stimulation.
• COG 3D threads: Barbs in multiple directions — pulling force in all planes.
• Silhouette Soft: Bidirectional conical barbs; high lifting + long absorption. FDA approved.

Thread Type Selection by Indication

PDO Threads: Mono, Cog, Screw, Tornado Comparison

PDO (polydioxanone) is the most established and widely used polymer in thread lifting. Having been used as a surgical suture material since the 1980s, PDO was adapted for aesthetic thread applications in the mid-2000s. It is the polymer group with the greatest structural variety:

PLLA Threads: Difference from Sculptra

PLLA (polylactic acid) is produced from the same polymer used in Sculptra dermal filler. However, PLLA in thread form works through a different mechanism than Sculptra:

• Sculptra: Microparticle form, spreads over a wide area for diffuse collagen stimulation. No mechanical lifting.
• PLLA threads: Directed, linear collagen stimulation + mechanical lifting in barbed form. A more controlled and localised effect.

The advantage of PLLA threads is an absorption time 2–3 times longer than initial PDO threads. Collagen stimulation capacity is higher; histological studies have documented active type I collagen synthesis at 24 months. There is no cost advantage — they are more expensive than PDO — but the durability advantage may justify this cost.

PCL Threads: Longest Effect Duration, Highest Cost

PCL (polycaprolactone) is one of the slowest-absorbing bioabsorbable polymers in medicine. It hydrolyses at normal body temperature in approximately 18–24 months — significantly longer than PLLA and PDO. Key clinical characteristics of PCL threads:

• High elasticity — can flex with tissue movement, low risk of breakage.
• Strong fibroblast stimulation — histological collagen increase documented up to 36 months.
• Less inflammatory response — high tissue tolerance.
• High tensile strength — mechanical lifting power is maintained longer than PDO and PLLA.

The disadvantage of PCL threads is cost and comparatively less clinical experience at this time. Silhouette Soft is an FDA-approved PCL-based thread system and the best-documented PCL product through global clinical studies.

CE-Certified Products and Quality Assurance

Threads used for medical purposes must carry the CE (Conformité Européenne) mark — a legal requirement. The CE mark certifies the product's compliance with European Union medical device standards.

Risks of non-CE threads:

• Sterility not guaranteed → increased risk of infection.
• Polymer purity unverified → risk of tissue reaction.
• Barb geometry may be non-standard → inadequate anchoring.
• Reduced legal protection for the patient.

At Virtuana Clinic, only CE-certified, manufacturer-guaranteed threads are used.

Which Technique for Which Thread?

Once the thread is selected, technique also matters:

• PDO mono threads: Placed into the subdermal plane with a cannula or fine needle.
• COG threads: Placed into a deeper plane (above SMAS) with a specialised cannula or needle.
• Silhouette Soft: Requires a dedicated application kit; must be applied by a certified physician.

Patient Profile and Thread Matching: Which Thread for Whom?

The right thread selection is shaped not only by anatomical factors but also by patient profile:

Combined Thread Protocols: Mono + Cog Used Together?

Clinicians often do not limit themselves to a single thread type. Mixed protocols are common in practice:

• Mono + COG: While COG threads provide mechanical lifting, mono threads are placed between them to improve skin quality. The most common mixed use.
• PDO COG + PLLA mono: Immediate lifting (PDO COG) + long-term collagen network (PLLA mono). An effective combination for middle-aged patients.
• Threads + Botox: Botox for platysma and cheek muscles reduces mechanical pressure on threads; thread longevity increases.
• Threads + Filler: Threads do not provide volume — they only lift. Adding HA filler when volume loss is present noticeably improves results.
• Threads + PRP: PRP accelerates post-procedure tissue healing and strengthens collagen stimulation.

Virtuana Clinic Thread Selection Protocol

At Virtuana Clinic (Izmit/Kocaeli), the thread lift planning process involves personalised thread selection based on each patient's facial anatomy, skin quality and individual budget/expectation balance. All threads used are CE-certified, manufacturer-guaranteed products. At the initial consultation, facial analysis is performed and the appropriate thread type and quantity are demonstrated through simulation.

This article is for informational purposes only. Please consult a qualified physician for treatment decisions.