This laser treatment works by creating numerous microscopic thermal injury zones of controlled width, depth and density that are surrounded by a reservoir of spared normal and healthy tissue, allowing rapid repair of laser induced thermal injury.
Starting from the beginning of adulthood to the age of 80 years, the skin elasticity goes down by around 30%. Studies have shown an increase in elasticity of around 4-5% after a session of Co2 laser fractional resurfacing, which represents a significant gain.
Fractional laser is a promising procedure for facial skin rejuvenation and to improve facial skin laxity. As the fractional laser treatment creates controlled microscopic thermal zones with healthy tissue surrounding it, this allows more intensive irradiation. Thus the skin tightening effect of fractional laser is more prominent and persists longer than that provided by diffuse thermal injury devices. The effect lasts an average of around 6 months.
The changes in the skin’s mechanical properties observed are due to the effects of the laser beam on the skin cells called dermal fibroblasts and on components of the surrounding tissue called extracellular matrix.
The heat breaks the structure of collagen and generates a shrinkage phenomenon. Tissue tension in human skin immediately increases because, although the fibers become shorter, the heat-stable cross-links between molecules are maintained, thus increasing the elastic properties of collagen polymers.