Quantitative evaluation of nonablative laser technology

Area of Science:

• Dermatology
• Biomedical Engineering
• Aesthetic Medicine

Background:

• Assessing subtle skin changes from nonablative laser treatments for facial rhytides and acne scars is challenging with traditional methods.
• Objective, noninvasive tools are needed to accurately quantify treatment outcomes.
• The 1,064 nm QS Nd:YAG laser is a nonablative technique used for skin rejuvenation.

Purpose of the Study:

• To objectively measure and quantify facial skin topography and biomechanical properties after nonablative laser treatments.
• To evaluate the efficacy of the 1,064 nm QS Nd:YAG laser for treating photodamaged skin and acne scarring.
• To assess the correlation between objective measurements and clinical outcomes.

Main Methods:

• Utilized a 3D microtopography imaging system (PRIMOS) to assess skin surface topography.
• Employed a suction-based device (BTC-2000) to measure skin biomechanical properties (stiffness and compliance).
• Analyzed four facial sites (cheeks, forehead) in patients with photodamage and acne scarring before and after 3-5 laser treatment sessions, with follow-ups at 3 and 6 months.

Main Results:

• Skin roughness decreased by 11% in photodamaged skin and 33% in acne scarring after 3 sessions.
• Significant improvements in skin smoothness were observed at 6 months post-treatment (26% for photodamage, 61% for acne scarring).
• Photodamaged skin showed decreased stiffness (23%) and increased compliance (30%), while acne-scarred skin showed increased stiffness (50%) and decreased compliance (30%) at 6 months.

Conclusions:

• 3D in vivo optical imaging and biomechanical analysis provide rapid, quantitative assessments of nonablative laser treatment outcomes.
• These objective methods correlate with clinical and subjective improvements in facial rhytides and acne scars.
• The study validates the use of these novel instruments for evaluating laser therapies and optimizing treatment regimens.