Abstract：
BACKGROUND: Performing laser hair removal treatments on dark skin is limited by the quantity of melanin within the skin. To minimize side effects, lower values of fluence are selected when using standard 755 or 810 nm diode lasers. However, this approach may limit the effectiveness of the procedure, particularly when treating areas with thin and less pigmented hair, which is often the case in facial regions. To improve results, high-power triple wavelength diode lasers can be used. This study aims to assess the efficacy, safety, and comfort of treatments that remove facial hair with a high-power triple wavelength diode laser (810, 940, and 1060 nm) in static mode on Asian patients with thin and less pigmented hair.
METHODS: A single-center retrospective cohort study was carried out using a high-power triple wavelength diode laser (810, 940, and 1060 nm), with a 2.7 cm2 spot size, on faces with thin and less pigmented hair. The study comprised 23 subjects with Fitzpatrick skin types IV and V. Effectiveness was measured by counting the hairs that appeared in high-resolution photos taken prior to and following the procedure, in addition to the Global Aesthetic Improvement Scale (GAIS). Furthermore, mathematical 3D simulations were created on the COMSOL Multiphysics® software to allow for comparisons to be made with regard to thermal damage sustained by the hair follicles and epidermal heating. Assessments were also made in relation to side effects.
RESULTS: An average of 66% hair reduction was observed. Patient satisfaction was between 4 and 5 points on the GAIS scale, indicating that the treatment was very well received and tolerated. Adverse side effects were not observed.
CONCLUSIONS: It can be concluded that the use of a high-power triple wavelength diode laser (810, 940, and 1060 nm) is safe and effective for the treatment of very fine and less pigmented facial hair on Asian skin. Furthermore, a triple wavelength (810, 940, and 1060 nm) laser is absorbed less by the melanin in the skin, enabling the use of higher fluences in stamping mode, with greater efficacy and safety for darker skin.
METHODS: A single-center retrospective cohort study was carried out using a high-power triple wavelength diode laser (810, 940, and 1060 nm), with a 2.7 cm2 spot size, on faces with thin and less pigmented hair. The study comprised 23 subjects with Fitzpatrick skin types IV and V. Effectiveness was measured by counting the hairs that appeared in high-resolution photos taken prior to and following the procedure, in addition to the Global Aesthetic Improvement Scale (GAIS). Furthermore, mathematical 3D simulations were created on the COMSOL Multiphysics® software to allow for comparisons to be made with regard to thermal damage sustained by the hair follicles and epidermal heating. Assessments were also made in relation to side effects.
RESULTS: An average of 66% hair reduction was observed. Patient satisfaction was between 4 and 5 points on the GAIS scale, indicating that the treatment was very well received and tolerated. Adverse side effects were not observed.
CONCLUSIONS: It can be concluded that the use of a high-power triple wavelength diode laser (810, 940, and 1060 nm) is safe and effective for the treatment of very fine and less pigmented facial hair on Asian skin. Furthermore, a triple wavelength (810, 940, and 1060 nm) laser is absorbed less by the melanin in the skin, enabling the use of higher fluences in stamping mode, with greater efficacy and safety for darker skin.
摘要：
背景:对深色皮肤进行激光脱毛治疗受到皮肤内黑色素量的限制。为了尽量减少副作用，使用标准755或810nm二极管激光器时，选择较低的通量值。然而,这种方法可能会限制程序的有效性，特别是在处理头发稀疏和色素较少的区域时，这通常是面部区域的情况。为了改善结果，可以使用高功率三波长二极管激光器。本研究旨在评估疗效，安全,和舒适的治疗，去除面部毛发与高功率三波长二极管激光（810，940和1060nm）在静态模式下，亚洲患者的头发薄，色素少。
方法：使用高功率三波长二极管激光器（810、940和1060nm）进行了单中心回顾性队列研究，具有2.7cm2的光斑尺寸，在头发薄而色素少的脸上。该研究包括23名FitzpatrickIV型和V型皮肤受试者。通过计算在手术之前和之后拍摄的高分辨率照片中出现的毛发来测量有效性。除了全球美学改善量表(GAIS)。此外，在COMSOLMultiphysics®软件上创建了数学3D模拟，以便对毛囊和表皮加热造成的热损伤进行比较。还对副作用进行了评估。
结果:观察到平均66%的毛发减少。患者满意度在GAIS量表上为4至5分，表明该治疗非常受欢迎和耐受。未观察到不良副作用。
结论：可以得出结论，使用高功率三波长二极管激光器（810、940和1060nm）可以安全有效地治疗亚洲皮肤上非常精细和色素沉着较少的面部毛发。此外，三波长（810、940和1060nm）激光被皮肤中的黑色素吸收较少，能够在冲压模式中使用更高的通量，对深色皮肤具有更大的功效和安全性。
方法：使用高功率三波长二极管激光器（810、940和1060nm）进行了单中心回顾性队列研究，具有2.7cm2的光斑尺寸，在头发薄而色素少的脸上。该研究包括23名FitzpatrickIV型和V型皮肤受试者。通过计算在手术之前和之后拍摄的高分辨率照片中出现的毛发来测量有效性。除了全球美学改善量表(GAIS)。此外，在COMSOLMultiphysics®软件上创建了数学3D模拟，以便对毛囊和表皮加热造成的热损伤进行比较。还对副作用进行了评估。
结果:观察到平均66%的毛发减少。患者满意度在GAIS量表上为4至5分，表明该治疗非常受欢迎和耐受。未观察到不良副作用。
结论：可以得出结论，使用高功率三波长二极管激光器（810、940和1060nm）可以安全有效地治疗亚洲皮肤上非常精细和色素沉着较少的面部毛发。此外，三波长（810、940和1060nm）激光被皮肤中的黑色素吸收较少，能够在冲压模式中使用更高的通量，对深色皮肤具有更大的功效和安全性。
