Comparison of 1064‐nm and Dual‐Wavelength (532/1064‐nm) Picosecond‐Domain Nd:YAG Lasers in the Treatment of Facial Photoaging: A Randomized Controlled Split‐Face Study

Background and Objectives To compare the efficacy and safety of 1064‐nm and dual‐wavelength (532/1064 nm) picosecond Nd:YAG lasers with a holographic optic in the treatment of facial photoaging. Study Design/Materials and Methods In this prospective, randomized split‐face study, each half of each participant′s face was randomly treated with a 1064‐nm or 532/1064‐nm picosecond laser. All participants underwent five treatment sessions and follow‐up visits 1 and 3 months after the final treatment. The primary outcomes were measured as the global photoaging scores, determined by two physicians who were blinded to the treatments. The secondary outcomes were the participant‐assessed Global Aesthetic Improvement Scale (GAIS) and satisfaction scores. Histopathological examinations were performed. Results Global photoaging scores decreased significantly after treatment with either laser. The global photoaging scores, GAIS scores, and satisfaction scores did not differ significantly between the 1064‐nm and 532/1064‐nm picosecond laser treatments. Histological changes were similar between the two groups. Intraepidermal vacuoles and dermal hemorrhaging were observed immediately and 24 h after treatment. After five treatments, neocollagenesis was observed in the upper dermis of both groups, and elastic fibers were more elongated and orderly. Conclusions Treatments with 1064‐nm and 532/1064‐nm picosecond Nd:YAG lasers were comparably effective at improving photodamaged facial skin by remodeling the collagen and elastin network through laser‐induced optical degradation and vascular damage.