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

Updates on Lasers in Dermatology

The introduction of selective photothermolysis by Drs. John Parrish and Rox Anderson in 1983 revolutionized how lasers are used in dermatology. The theory allowed for lasers to be used in a variety of applications both safe and effectively, and the number of applications has only expanded with time. From the first application on vascular birthmarks to more recent applications for acne, this review covers the evolution of lasers from the beginning to where we are headed.

Skin rejuvenating effect of a combined triple-wavelength (755 nm, 810 nm, and 1064 nm) laser: a preliminary study

With an increasing demand for noninvasive skin rejuvenation techniques, several light-based devices have been introduced. Due to its ability to deliver thermal energy from the superficial to deeper levels of the dermis, a combined triple-wavelength laser (755 nm, 810 nm, and 1064 nm) can be used for skin rejuvenation. The objective of this study was to assess the effectiveness and safety of a combined triple-wavelength laser for skin rejuvenation. A total of 28 female patients seeking skin rejuvenation treatment were included. All patients underwent five consecutive treatment sessions at a two-week interval. Clinical improvement of aging-related cutaneous change was noted by the treating dermatologists and patients. Biopsies were performed on the faces of consenting patients before and two weeks after the final treatment. Significant clinical improvements were observed by both patients and evaluating dermatologists. Based on the patient satisfaction questionnaire, 78% of patients reported a self-assessed improvement of more than 25%. Additionally, 86% of patients showed an improvement of more than 25% on objective assessment by dermatologists. Histopathological findings revealed increased collagen and elastic bundles throughout the dermis. Except for transient pain during treatment, no serious adverse effects were reported. The findings of this study suggest that the combined triple-wavelength laser may be an effective and safe nonablative option for skin rejuvenation.

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.

Novel laser hair removal in all skin types

BACKGROUND

Laser has been long accepted as a solution for excess or unwanted hair growth yet traditional lasers are not always ideal for safe and effective outcome for all skin types and hair characteristics. A diode laser module combining three wavelengths (755, 810, and 1064 nm) in a single pulse was developed to provide a fast and long-term solution for subjects with various profiles.

AIMS

To evaluate the safety and efficacy of a Triple wavelength diode laser module for hair removal treatment in all skin types (Fitzpatrick I-VI).

SUBJECTS AND METHODS

This was a prospective, dual centered, single-arm study. Subjects were treated with a novel diode laser module. Thirty-six subjects were enrolled, sixteen with Fitzpatrick skin types I-IV (46%) and twenty with Fitzpatrick skin types V-VI (54%). Treatment areas were axilla and bikini lines. Subjects underwent 4 treatment sessions at 6 weeks ± 5 days intervals and attended a follow-up visit 3 months after the last treatment session. 2D digital photographs were taken at baseline and at the follow-up visit, and a hair count was conducted by three blinded evaluators.

RESULTS

A significant reduction in hair count between baseline and the 3-month follow-up visit was observed in both axilla and bikini lines for all skin types. The mean hair reduction was 41.5 ± 19.4% and 48.1 ± 20.9% in the axilla and bikini line, respectively. A significant hair reduction was also observed within skin type groups; mean hair reduction 45.5 ± 16.9% and 40.3 ± 17.2% in skin types I-IV and V-VI, respectively, indicating similar efficacy for both light and dark skin types. No serious adverse events were reported.

CONCLUSIONS

This study demonstrates that the Soprano Titanium laser platform is safe and effective for hair removal treatment in all skin types.

Das schöne, glatte Bein: Haarentfernung durch Laser und lichtbasierte Verfahren

Die Fotoepilation zählt zu den meistgefragten nichtchirurgischen Eingriffen in der ästhetischen Dermatologie. Haarlose, glatte Beine gelten dabei als Schönheitsideal.

Fotoepilation mittels Laser oder hochenergetischer Blitzlampen (sog. Intensed-Pulsed-Light-Geräte) stellt ein sicheres und effektives Verfahren dar. Der Wirkmechanismus beruht auf dem Prinzip der selektiven Fotothermolyse, wobei eine gezielte thermische Schädigung pigmentierter Haarfollikel unter Schonung des umliegenden Gewebes erfolgt. Melaninpigment des Haarschaftes absorbiert als Zielchromophor Licht eines speziellen Wellenlängenspektrums und führt durch Wärmediffusion zur Schädigung der für das Haarwachstum wichtigen Stammzellen im äußeren Haarwurzelschaft.

Patienten müssen über die Notwendigkeit wiederholter Behandlungen sowie den häufig nur partiellen und temporären Haarverlust aufgeklärt werden. Dunkle Terminalhaare bei hellen Hauttypen lassen sich effektiv entfernen. Bei dunklen Hauttypen besteht aufgrund des erhöhten epidermalen Melaninvorkommens ein erhöhtes Risiko für Nebenwirkungen wie Verbrennungen, Dyspigmentierungen und Narben. Sehr feine, helle oder rote Haare lassen sich kaum mit konventionellen Fotoepilationsverfahren entfernen. Haarentfernungsgeräte für den Heimgebrauch sind eine kostengünstige, einfach anzuwendende Alternative, weisen aber im Vergleich zur professionellen Fotoepilation eine geringere Effektivität auf.

Das schöne, glatte Bein: Haarentfernung durch Laser und lichtbasierte Verfahren

Die Fotoepilation zählt zu den meistgefragten nichtchirurgischen Eingriffen in der ästhetischen Dermatologie. Haarlose, glatte Beine gelten dabei als Schönheitsideal.

Fotoepilation mittels Laser oder hochenergetischer Blitzlampen (sog. Intensed-Pulsed-Light-Geräte) stellt ein sicheres und effektives Verfahren dar. Der Wirkmechanismus beruht auf dem Prinzip der selektiven Fotothermolyse, wobei eine gezielte thermische Schädigung pigmentierter Haarfollikel unter Schonung des umliegenden Gewebes erfolgt. Melaninpigment des Haarschaftes absorbiert als Zielchromophor Licht eines speziellen Wellenlängenspektrums und führt durch Wärmediffusion zur Schädigung der für das Haarwachstum wichtigen Stammzellen im äußeren Haarwurzelschaft.

Patienten müssen über die Notwendigkeit wiederholter Behandlungen sowie den häufig nur partiellen und temporären Haarverlust aufgeklärt werden. Dunkle Terminalhaare bei hellen Hauttypen lassen sich effektiv entfernen. Bei dunklen Hauttypen besteht aufgrund des erhöhten epidermalen Melaninvorkommens ein erhöhtes Risiko für Nebenwirkungen wie Verbrennungen, Dyspigmentierungen und Narben. Sehr feine, helle oder rote Haare lassen sich kaum mit konventionellen Fotoepilationsverfahren entfernen. Haarentfernungsgeräte für den Heimgebrauch sind eine kostengünstige, einfach anzuwendende Alternative, weisen aber im Vergleich zur professionellen Fotoepilation eine geringere Effektivität auf.