Hair,Removal,Painless,and,Perm health Hair Removal - Painless and Permanent Hair Removal
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Hair removal is a vague term that has only recentlybeen accurately defined. Temporary hair reduction is defined as a delayin hair growth, which usually lasts 1-3 months, consistent with theinduction of telogen. Permanent hair reduction refers to a significantreduction in the number of terminal hairs after a given treatment,which is stable for a period of time longer than the complete growthcycle of hair follicles at the given body site.Demand for arapid, noninvasive method for hair removal has resulted in theintroduction of various light sources for hair removal. Light source ofhair removal commonly focuses on ruby, alexandrite, diode, and Nd:YAGlasers and intense pulsed light sources. These devices are designed totarget either an endogenous chromophore (melanin) or an exogenouschromophore (carbon suspension, photosensitizer, and exogenous dye).Laser hair removal is one of the most recent systems of hair removalthat has been introduced. Today, a large number of specific lasersystems are available in the market, which makes the customer a bitapprehensive about their attributes, selection, treatment protocols andeffects. Laser hair removal is one of the light sources of hairremoval. Hair follicles are destroyed by light in a number of ways suchas thermal, photomechanical or photochemical mechanism with generationof toxic mediators like singlet oxygen or free radicals.Thermalmechanism for hair removal has recently been introduced to induceselective damage to hair follicles. Based on the principles ofselective photothermolysis, this principle predicts that selectivethermal damage of a pigmented target structure will result whensufficient quantity of light at a given wavelength is absorbed by thetarget in a time equal to or less than the thermal relaxation time ofthe target.Melanin is the natural chromophore for targeting hairfollicles in the visible to near-infrared region, Lasers or lightsources that operate in the red or near-infrared wavelength region liein an optical window of the spectrum in which selective absorption bymelanin is combined with deep penetration into the dermis. Therefore,deep and selective heating of the hair shaft, the hair follicleepithelium, and the heavily pigmented matrix is possible in the 600nmto 1100nm region. However, melanin in the epidermis presents acompeting site for absorption. Selective cooling of the epidermis hasbeen shown to minimize epidermal injury.Photomechanicaldestruction of hair has been attempted with very short nanosecondpulses. It has been done by the help of Q-switched 1064-nm Nd:YAGlasers, with and without carbon suspension. Short pulses are used totarget hair follicles resulting in rapid heating of the chromophore(melanin). It leads to photo acoustic shock waves that cause focalphotomechanical disruption of the melanocytes but not completefollicular disruption. Therefore, the Q-switched Nd:YAG lasers are notlikely to produce long-term hair removal.A distinction needs tobe made between permanent and complete hair loss. Immediately afterlaser treatment, the hair shaft shows fragmentation with focal ruptureinto the follicular epithelium and thermal damage to the surroundingfollicular epithelium. The extent of thermal damage is dependent on thepulse width but retains confinement on the spatial scale of thefollicle itself. Histological changes are almost guaranteed in theperson undergoing laser hair removal. However, such form of hairremoval should be carried out under the supervision of a qualifieddermatologist as it involves considerable degree of expertise. Article Tags: Hair Removal Hair, Laser Hair Removal, Hair Removal, Permanent Hair, Removal Hair, Hair Follicles, Light Sources, Nd:yag Lasers, Laser Hair, Thermal Damage
Hair,Removal,Painless,and,Perm