Cutis Lux

Fractional photothermolysis: the 2004 study behind every fractional laser

Short answer

This 2004 study introduced fractional photothermolysis: instead of heating the whole skin surface, a 1.5 µm laser makes a grid of microscopic heat zones about 0.1 mm wide. Skin around each zone heals it within a day. Eye-area wrinkle scores improved 18% three months after four treatments, with minimal redness or swelling.

By Cutis Lux editorial team · Updated · How we compare

Study
Manstein D, Herron GS, Sink RK, et al. Lasers Surg Med. 2004;34(5):426-38.
Design
Prototype clinical study
People
45 (15 forearm, 30 periorbital)
Topic
Photoaging
Source
PubMed 15216537 · DOI 10.1002/lsm.20048

Why it matters

It is the founding paper of fractional laser treatment, the principle used by clinic resurfacing lasers and by home devices such as Tria FRX and MimiSilk Iris.

What they did

  • Tested a prototype 1.5 µm laser that fires a pattern of microscopic treatment zones (MTZs) into the skin.
  • Varied the density of zones on the forearms of 15 people and examined the skin under the microscope.
  • Treated the eye area of 30 people with photoaged skin four times over 2–3 weeks and followed them for 3 months.

What they found

  • Typical zones were 100 µm wide and reached 300 µm deep.
  • The skin surface had fully healed within one day.
  • Wrinkle scores improved 18% three months after the last treatment, with 2.1% tissue tightening.
  • Redness and swelling were minimal.

What it cannot tell you

  • Prototype clinic devices, not today’s home lasers, which use lower energy.
  • No control group for the periorbital treatments.
  • The authors themselves called for further studies to set optimal parameters.

Takeaway

This is the science fractional home lasers build on. It shows the mechanism works and heals fast, but it tested clinic prototypes, not home devices.

Matching devices

Devices whose published technology match this study: MimiSilk Iris and Tria FRX. None of them was the device tested unless the study names it.

Not medical advice. Summary based on the published abstract; read the full paper for detail.

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