Title: Laser hair removal: comparison of long-pulsed Dd:YAG, long-pulsed alexandrite, and long-pulsed diode lasers
Abstract: Background: Advances in laser technology over the past several years has led to the development of numerous lasers for the treatment of unwanted hair. Laser wavelength is a key factor influencing treatment efficacy and complication rates. Objective: To compare the efficacy and safety of laser hair removal using 3 different laser systems. Methods: A retrospective study of 805 consecutive laser-assisted hair removal treatments, conducted on 75 patients by means of either a long-pulsed Nd:YAG, a long-pulsed alexandrite, or a long-pulsed diode laser is reported. All patients were evaluated at least 3 months after the last treatment; and their present conditions were compared with the first day photographs. Results: Mean hair reduction was 42.4%, 65.6%, and 46.9% in Nd:YAG, alexandrite, and diode lasers, respectively. When number of treatment sessions were taken into account, the efficacy of alexandrite and diode lasers was not significantly different, while both systems were more efficacious than Nd:YAG. Neither of the laser systems showed better results for a particular skin type. The occurrence of side effects was not significantly different between 3 laser systems. Conclusion: Both long-pulsed alexandrite and long-pulsed diode laser systems are effective in the treatment of unwanted hairs, and they are more efficacious than Nd:YAG laser.