Treatment of Neck Lines and Forehead Rhytids with a Nonablative 1540-nm Er:Glass Laser: A Controlled Clinical Study Combined with the Measurement of the Thickness and the Mechanical Properties of the Skin

All patients reported an improvement in both skintone and texture. Using ultrasound imaging, dermal thicknessof neck and forehead increased, respectively, by 70 13lm(p o0.001) and 110 19lm(p0.003). A dramatic in-crease of initial stress of the forehead skin (firmness) wasobtained, from 7.62 3.68 before treatment to 16.68 7.443 months after the fifth treatment (po0.0002). No immediateor late adverse effects were noted throughout the treatmentregimen.