Minimally ablative resurfacing with the confluent 2,790 nm erbium:YSGG laser: a pilot study on safety and efficacy.
BACKGROUND
The 2,790 nm Er:YSGG wavelength has a lower water absorption coefficient than the 2,940 nm Er:YAG, but a higher coefficient than the 10,600 nm CO(2) laser. This allows ablative resurfacing with mild thermal coagulation, which may increase clinical efficacy while reducing patient downtime.


OBJECTIVE
To evaluate the efficacy and safety of the confluent 2,790 nm Erbium:YSGG (Pearl™, Cutera) laser for facial rejuvenation.


METHODS
Eleven subjects (mean age 50, skin types I-III) with mild to moderate photodamage and wrinkles had two facial treatments with the 2,790 nm Er:YSGG laser using a fluence of 3.5 J/cm(2), pulse duration of 0.4 msecond, and 20% overlap. Treatments were performed 6 weeks apart. Pre-auricular biopsies from five subjects were evaluated at baseline and 6 weeks after the final treatment. Data from blinded photo assessments and subjects' self-assessment of improvement were analyzed 6 weeks after the final treatment. Additionally, long-term safety and efficacy were evaluated 2 years after the final treatment.


RESULTS
Histologically, 80% of subjects had new collagen formation in the dermal grenz zone, and 60% had increased epidermal thickness. Almost all subjects (91%) showed improvement in tone/texture, 82% of subjects showed improvement in dyschromia and fine lines, and 54% showed improvement in wrinkles 6 weeks after the final treatment. Subjects' self assessment indicated "significant" to "dramatic" improvement in dyschromia (91% of subjects) and tone/texture (82%) 6 weeks after the final treatment. All subjects saw "mild" to "significant" improvement in fine lines and wrinkles. At the 2-year follow-up visit, 57% of the overall improvement achieved at 6 weeks was maintained. No adverse events were reported throughout the study.


CONCLUSIONS
Ablative resurfacing with the 2,790 nm Er:YSGG laser demonstrated visible improvement in photodamage with good tolerability and minimal downtime. Subjects were highly satisfied, especially with respect to dyschromia, skin tone, and texture.
Marshfield Clinic, Marshfield, Wisconsin 54449, USA.
Susan E
SE
Walgrave
David A
DA
Kist
Ayse
A
Noyaner-Turley
Brian D
BD
Zelickson
D000328:Adult; D000368:Aged; D001706:Biopsy; D003357:Cosmetic Techniques / Q000009:adverse effects / Q000295:instrumentation*; D062109:Dermatologic Surgical Procedures; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053844:Lasers, Solid-State / Q000009:adverse effects; D008875:Middle Aged; D017060:Patient Satisfaction / Q000706:statistics & numerical data; D010865:Pilot Projects; D012060:Rejuvenation; D016037:Single-Blind Method; D012867:Skin / Q000473:pathology; D015595:Skin Aging