The durability of results in scar filler treatments depends not only on the filler material used but also on the technique applied and the biological response induced within the tissue. Particularly, techniques performed with multiple needle entry points and repetitive, superficial injections (such as dense microinjection approaches) appear to exert both mechanical and biochemical effects.

In such approaches, numerous needle insertions create controlled microtrauma within the dermis, stimulating collagen production (neocollagenesis). At the same time, the mechanical disruption caused by the needle can produce a subcision-like effect, contributing to the release of fibrotic strands tethering the scar. This provides an important mechanical advantage in reducing scar depth.

In addition, hyaluronic acid (HA) is not merely a volumizing filler; it also demonstrates biostimulatory effects on the extracellular matrix. Evidence in the literature suggests that HA can enhance fibroblast activity, promoting both collagen and elastin production and supporting tissue remodeling. This process may extend beyond the initial temporary volumizing effect and contribute to longer-lasting structural improvements.

Therefore, when applied with appropriate technique and in repeated sessions, hyaluronic acid injections for scar treatment may provide not only a temporary filling effect but also longer-term benefits through tissue remodeling and dermal regeneration. However, the degree of durability may vary depending on the patient’s biological response, scar type, and treatment protocol.

In conclusion, when performed with the correct technique, scar filler treatments can achieve long-lasting—and in some cases near-permanent—clinical improvements through the combined effects of mechanical (subcision-like release) and biological (collagen and elastin stimulation) mechanisms.