Before and After Laser and IPL Treatment

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Before and After Laser and IPL Treatment

Laser and IPL hair removal, the Treatment Process.


What kind of results can you expect from Laser and SPL Epilation?  

Most technicians can expect up to a 90% improvement rate.  This means 9 of 10 hairs will be destroyed after treatment (1-5 applications). The few hair follicles which do not respond to the first treatments will almost certainly be destroyed from additional applications.



CW diode 808 laser hair removal before picture underarm  CW diode 808 laser hair removal after picture underarm



Empirical Evidence/Clinical Study Introduction.  This study reports treatment using the semiconductor diode laser system, a high power, long pulsed diode with a wavelength of 808nm for laser hair reduction.  Laser hair reduction operates on the principles of selective photothermolysis.  This process combines the selective absorption of light energy by the melanin in the hair follicle with suitable fluences and pulse durations to allow selective injury to the hair follicle while sparing skin(1).



diode 808 laser hair removal before picture shoulder  diode 808 laser hair removal after picture shoulder


The major 'absorber' of radiation in the skin between 300 and 1200nm is melanin(2), which is found primarily in the epidermis, hair shaft, and hair follicle. This study was conducted using the 808nm wavelength diode laser for its increased tissue penetration, optimized melanin absorption and safety for treating a wide range of hair diameters/colors and skin types.

The 808nm wavelength penetrates deeply to reach the germinative cells of the hair bulb and the bulge in even the deepest follicles. The 808nm wavelength appears to be the correct balance, offering safety on darker skin types while providing enough absorption to effectively treat finer and/or lighter hairs.

To achieve selectivity, the laser energy is applied in a pulse duration that approximately equals the thermal relaxation time of the hair shaft, but exceeds the thermal relaxation time of the epidermal melanin. This causes injury to the hair shaft resulting in growth delay and reduction, but allows the heat to dissipate away from the epidermis without causing injury. The semiconductor diode laser system can deliver short pulses or pulse durations up to 100msec. The thermal relaxation time for the hair follicle is dependent upon its diameter; thus longer pulse durations are theoretically best suited for medium to coarse hairs(3) while finer hairs may require shorter pulses.

Clinical studies have shown that aggressive skin cooling allows the use of higher fluences and results in a greater margin of safety for all and especially for darker skin types(4). Contact with the patient's skin after each laser pulse provides a thermal quenching effect and additional epidermal protection.

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Treatment Efficacy and Overall Results.  Eighteen subjects completed three treatment sessions, eight subjects completed two treatment sessions and ten subjects completed only one treatment session. Only one subject had 2 different sites treated (i.e. neck and upper lip). The remaining subjects had only one treatment site, although two hair count measurements were obtained (i.e. both right and left side of the chin or right and left axilla, etc). The average hair reduction of all sites was 41% after the first treatment, 55% after the second treatment and 68% after the third treatment. Hair reduction varied by both treatment site (axilla, face, legs, back, neck, arms, abdomen, and bikini) and number of treatment sessions (1-3). Hair reduction continued to improve with each subsequent treatment. The chin treatment sites appeared to show consistently higher hair reduction measurements than other areas of the face and overall.

References
1. Anderson RR, Parish JA. Selective photothermolysis: precise microsurgery by selective absorption of pulsed radiation. Science 1983; 220: 524-527.
2 Anderson RR, Parkish JA. The optics of human skin. J. Invest. Dermatol 1981;77:13-9.
3. Adrian RM, Tanghetti E. Clinical evaluation of a high energy long-pulse ruby laser for the treatment of unwanted body hair. Lasers Med Surg 1997; supp 9:36.
4. Grossman MC, Dierickx CC, Farinelli WA, Flotte TJ, Anderson RR. Damage to hair follicles by normal-mode ruby laser pulses. J AM Acad Dermatol 1996;35:889.
5. Battle EF. Study of very long-pulsed (100 ms) high powered diode laser for hair reduction on all skin types. Coherent Medical, Santa Clara, CA 2000.
6. Handrick, C., Alster, T. Comparison of long pulsed diode and long pulsed alexandrite lasers for hair removal; A long-term clinical and histologic study Derm Surgery, 2001;27:622-626.
7. Anderson, RR., Laser-tissue interactions. In: Goldman MP, Fitzpatrick RE, editors. Cutaneous laser surgery: the art and science of selective photothermolysis. St. Louis (MO): Mosby-Year Book Inc; 1994. p. 1-18.

 

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