Types of Dermal Fillers: HA, Stimulators and Permanent Fillers

Comparing Filler Categories

Dermal fillers are categorised by their base material, speed of visual onset, tissue persistence, and reversibility¹. In clinical practice, four primary chemical classes are commonly described: hyaluronic acid (HA), calcium hydroxylapatite (CaHA), poly-L-lactic acid (PLLA), and polymethylmethacrylate (PMMA)¹.

Each category functions differently:

Choosing no treatment is always a valid option. Filler selection is not one-size-fits-all; the choice between an immediate, reversible gel or a gradual stimulator depends entirely on individual facial anatomy, skin thickness, and personal aesthetic goals³⁵⁶.

HA Versus CaHA, PLLA and PMMA

Dermal fillers are categorised into distinct chemical classes, each interacting with facial tissues through different mechanisms¹.

Hyaluronic acid (HA) is a naturally occurring polysaccharide found in skin and cartilage⁷⁸. When crosslinked into an injectable gel, it binds water to swell and deliver immediate hydration, smoothing, and projection⁷⁸, with clinical effects lasting approximately 6 to 12 months⁷⁸. HA is widely used due to its favourable safety profile and reversibility³.

In contrast, other materials function differently:

• Calcium hydroxylapatite (CaHA) consists of synthetic mineral microspheres suspended in a gel carrier⁷⁹. It provides immediate volume along with high cohesivity and viscosity, while stimulating collagen synthesis over 12 to 18 months⁷⁹¹⁰.
• Poly-L-lactic acid (PLLA) is a biodegradable polymer suspension that acts as a pure stimulator⁸⁹. Its clinical effect depends on progressive neocollagenesis over weeks to months rather than immediate physical filler volume¹⁰, lasting up to 2 years⁹.
• Polymethylmethacrylate (PMMA) contains non-absorbable microspheres in a collagen carrier, creating a permanent structural matrix that does not dissolve⁹.

Whether a patient is suitable for HA or an alternative material is decided at the consultation with Dr. Vishal Purohit.

What Collagen Stimulation Means

Dermal fillers are categorised into space-occupying agents and biostimulants¹¹. While space-occupying products fill volume deficits, biostimulants activate fibroblasts to produce new collagen¹¹. Common biostimulating agents include calcium hydroxylapatite (CaHA) and poly-L-lactic acid¹¹.

When injected, these substances trigger a localized tissue response involving macrophage phagocytosis and cellular influx¹²¹³. Fibroblasts are stimulated to synthesize collagen around the particles, creating structural reinforcement rather than relying solely on inert space filling¹¹¹³¹⁴.

Unlike immediate space-occupying corrections, fibroplastic agents often require smaller amounts placed over several sessions spaced 1 to 2 months apart or longer¹³. This planned approach allows progressive tissue integration and prevents overcorrection between treatment cycles¹³.

At consultation, Dr. Vishal Purohit assesses facial structure and explains the difference between volume-replacing gels and collagen-stimulating options. While he offers dermal fillers in Jaipur, product choice and treatment planning are decided at the consultation.

Brand Families and Legacy Collagens

Early cosmetic filling historically relied on xenogenic and allogenic collagen preparations, such as bovine collagen (Zyderm, Zyplast) and bioengineered human collagen (Cosmoderm, Cosmoplast)¹⁵¹⁶¹⁷. A notable limitation of bovine collagen was the requirement for pre-treatment allergy testing¹⁵. These early collagen injectables also provided limited durability, often lasting only 2 to 4 months¹⁸, and have largely been withdrawn from the market¹⁵¹⁹.

Modern practice has largely transitioned to biofermented hyaluronic acid (HA) derived from bacterial sources such as Streptococcus equi¹⁷, alongside refined microparticle suspensions⁹¹⁸. Scientific cross-linking of HA chains creates distinct formulations that provide improved predictability and longer duration, generally lasting 6 to 18 months⁹¹⁵.

Commercial brand families differ primarily by physical properties and rheology—such as particle sizing, gel technology, and viscosity suited for varying tissue depths—rather than a difference in overall quality⁹¹⁵¹⁸.

Fat Transfer as a Separate Procedure

Autologous fat grafting involves transferring a patient’s own living adipose cells to address facial volume loss²⁰²¹. The tissue is harvested from donor sites using liposuction techniques, processed, and then reintroduced to correct facial hollowing²²²³.

Unlike manufactured gel fillers injected during a clinic visit, fat transfer is a surgical procedure performed in an operating theatre²²²³. The patient’s own cells provide natural tissue augmentation without the risk of an allergic reaction to foreign synthetic products²⁰²². While dermal fillers require repeating sessions over time to sustain volume, grafted fat that integrates into facial tissues can maintain correction for several years²⁰²⁴.

Fat transfer is often considered when addressing broader areas of volume deficit²⁵²⁶. Whether a patient is a suitable candidate for autologous fat grafting rather than dermal fillers, or whether the two modalities might be combined, is decided at the consultation with Dr. Vishal Purohit. A surgical assessment evaluates tissue quality, donor site suitability, and personal recovery considerations.

Dermal Filler Consultations in Jaipur

Facial anatomy, skin thickness, and personal aesthetic goals determine the appropriate approach to volume restoration. Selecting between immediate reversible gels, collagen stimulators, or surgical options requires careful assessment. To explore treatment options and understand the procedure, read the Dermal Fillers FAQs or arrange a consultation for Dermal Fillers in Jaipur by contacting the clinic directly on +91 7718183535.

This is educational information, not medical advice.