Static and dynamic modes of 810 nm diode laser hair removal compared: A clinical and histological study

Effects at cellular level of epilation with various laser wavelengths applied simultaneously on different skins: two case reports

This study evaluated the effects of laser application of diverse wavelengths applied simultaneously and on different skins. The sample included two participants, a woman with light skin with abdominal hair and a woman with dark skin and hair on the inner part of the lower limbs, who received a laser therapy session. After 45 days from laser application, abdominoplasty and thigh dermolipectomy surgery were performed. In the control sample, the hair follicles were in the anagen phase, showing the presence of Bcl-2 expression. In the treated areas, follicles were observed in an advanced phase (telogen), with the presence of CK-18 and negativity of Bcl-2, highlighting the phase of hair loss at that moment and the complete apoptosis of the investigated follicle. Significant difference was observed in the comparison of the anagen phase (p = .00) and it similarly occurred in the comparison of the telogen phase (p = .00). The presence of a greater amount of follicles in the anagen phase in the control area and follicles in the telogen phase in the treated area demonstrates the efficiency of the laser at different wavelengths when reaching different skin phototypes and hair thickness, being reinforced by apoptosis and cell proliferation markers. Therefore, the hair-removal process has been optimized with various laser wavelengths.

Effectiveness of Light-Emitting Diode Epilation on Different Skin Types: A Pilot Study

Objective: This study analyzed the histological and immunohistochemical changes in hair follicles submitted to epilation with light-emitting diode (LED). Background: The use of specific wavelengths of LED leads to the absorption of photons by chromophore tissues, enabling different photophysical and photochemical events, bringing therapeutic benefits such as removing body hair. Methods: The sample included five participants, with phototypes II-V, divided into two groups. The volunteers received a session of epilation with the Holonyak^® device on the pubic region and right groin, whereas the contralateral side was kept as a control. An energy of 10 J and a cooling temperature of -5°C were used, after which the pain provoked by the equipment was questioned using the analogue pain scale. After 45 days, the punching procedure was performed in the region where skin samples were taken for histological and immunohistochemical analysis. Results: For all phototypes, in the treated area, the follicles and sebaceous glands were in a stage of involution, showing perifollicular inflammatory infiltrate with changes suggestive of apoptosis. The apoptosis process was confirmed by the increase in markers cytokeratin-18 and cleaved caspase 3, in addition to the reduced expression of Blc-2, and the lower cell proliferation (Ki67), reinforcing the action of LED based on the definite involution and resorption of the follicle, through macrophages (CD68) triggered by the inflammatory process. Conclusions: The preliminary results of this study found relevant histological changes and immunohistochemical markers in the epilation process, which may indicate the efficacy of LED in permanent hair removal.

Efficacy and safety of triple wavelength laser hair reduction in skin types IV to V

BACKGROUND

Laser hair reduction is one of the most common laser procedures in dermatology. Laser systems available are Ruby at 694 nm, Alexandrite (755 nm), Diode (810nm), and Nd:YAG (1064 nm). Recently, devices presenting a combination of wavelengths have shown to produce high effective hair reduction with no related risks. This study was conducted with the Soprano Ice Platinum (Alma Lasers, GMBH, Germany) that emits a combination of three wavelengths at 755, 810, and 1064 nm in a single pulse.

AIMS

To establish the efficacy and safety of novel triple wavelength laser hair reduction technology in skin types IV to V.

PATIENTS AND METHODS

This was an investigator initiated, single-center, prospective clinical study conducted between December 2017 and June 2019 with a total of 25 patients (23 female and two male) above 18 years with skin types IV and V, areas included are face, beard, neck, chest, and others.

RESULTS

Hair reduction was assessed using the physician GAIS (global esthetic improvement scale) score: no results 0% reduction, poor 0%-25% reduction, average 25%-50%, good 50%-75%, and excellent 75%-100%. All 25 patients (mean age 28 years, range 18-52 y/o) completed all six sessions of the study.

CONCLUSION

Objective clinical assessment of hair reduction using the physician GAIS score in 90 anatomical sites scores an excellent reduction in 95.5% areas and good reduction in 80% areas. This current study shows that a synergistic combination of three diode laser wavelengths used for hair removal (755, 810, 1064 nm) is effective and safe to use in subjects skin types IV and V for facial and body hair.

2018 update on dermatologic laser therapy: Part 1 - epilation, vascular lesions and pigments

Technical advances in recent years have led to new dermatologic laser systems, light sources, and treatment concepts. Commonly used wavelengths - generated today with LED-based devices - allow for the combination of various tissue effects and are associated with improved outcomes. Laser hair removal has become more efficient with the use of diode lasers that emit multiple wavelengths simultaneously. In the near future, novel LED-based lasers will also be introduced for the treatment of vascular lesions. Here, too, the combination of different wavelengths promises to be beneficial. Picosecond lasers have led to advances in the field of pigment removal (tattoos).