android barcode scanner api java COSMETIC DERMATOLOGY: PRINCIPLES AND PRACTICE in Visual Studio .NET


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safety and efficacy of Dermicol-P35 and non-animal-stabilized hyaluronic acid gel for the correction of nasolabial folds Dermatol Surg 2007;33:S213 68 Homicz MR, Watson D Review of injectable materials for soft tissue augmentation Facial Plast Surg 2004; 20:21
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69 Falcone SJ, Doerfler AM, Berg RA Novel synthetic dermal fillers based on sodium carboxymethylcellulose: comparison with crosslinked hyaluronic acid-based dermal fillers Dermatol Surg 2007;33:S136 70 Von Buelow S, Pallua N Efficacy and safety of polyacrylamide hydrogel for facial soft-tissue augmentation in a 2-
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year follow-up: a prospective multicenter study for evaluation of safety and aesthetic results in 101 patients Plast Reconstr Surg 2006;118:85S 71 Michaels J, Michaels B Coupling advanced injection techniques for cosmetic enhancement Cosmetic Journal 2008;21:31
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CHAPTER 24 Lasers and Light Devices
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BOX 24-2 The three main chromophores in the skin include: Water Hemoglobin Melanin mediums can be liquid (dyes such as rhodamine), solid [eg, ruby, alexandrite, Nd:YAG, diode (semiconductor)], or gas (eg, helium-neon, argon, CO2) Several of the instruments in the cosmetic armamentarium that will be discussed here are not true lasers This fact does not render them any less useful in treating patients, but it is an important distinction to make The importance lies in the nature of the interaction between light and skin In 1983, Anderson and Parish introduced the theory of selective photothermolysis1 This theory states that the selectivity of a laser for its target relies on the fact that different wavelengths of light will be absorbed by different chromophores in the skin (Box 24-2) This allows us to selectively destroy these targets without damaging the surrounding tissues In order to accomplish this, the pulse width should be sufficiently long to heat the tissue to the level of destruction, but not long enough for that heat to transfer out of the target to the surrounding normal skin The duration of active lasing is termed the pulse width or pulse duration The ideal pulse duration for selective destruction of a target is determined by the size of the target The time it takes for the target to dissipate twothirds of its heat to the surrounding tissue is directly proportional to its size This is termed the thermal relaxation time (Trt) The pulse width should be equal to or shorter than this Trt in order to selectively destroy the target and not the normal surrounding tissue If the laser pulse is longer than the Trt, then there is more risk of unwanted damage to other tissues Lasers can emit light in a continuous fashion, or in spurts, or pulses The theory of selective photothermolysis really only applies to pulsed laser systems, as continuous lasing results in bulk heating of tissue, and hence little selectivity When light of any wavelength or intensity hits the skin four possible results ensue The light can be directly reflected from the skin This usually takes place at the stratum corneum, and this is the reason that practitioners wear protective eyewear even when not lasing near the eye Light that passes through the stratum corneum can be scattered by collagen in the dermis or transmitted through the dermis to the subcutaneous tissues The light that results in actual work being done on the tissues is the light that is absorbed Absorption in the skin is by three main chromophores Each of these target chromophores absorbs light at a different wavelength (Fig 24-1) Using these absorption spectra, we can select a laser with a wavelength that will be absorbed by the chromophore This allows us to treat the target and not the normal skin When the target tissue is beneath the epidermis, treatment of the target without damage to the epidermis is difficult to achieve without protection of the epidermis This protection is achieved via cooling systems Cooling systems are critical in several laser procedures including vessel destruction and laser hair removal There are several modes of cooling used in lasers today, including cryogen cooling, contact, ice, and direct cold air Employing these devices reduces injury to the epidermis Conversely, employing too much cooling when the target is in the epidermis results in an ineffective treatment Cooling systems are essential in laser
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Since 1960, when the first laser was invented by TH Maiman at the Hughes Research Laboratory, the research arm of the Hughes Aircraft Company in Malibu, CA, research into and development of lasers has blossomed into a multibillion dollar industry People have been especially fascinated by the capabilities and possibilities of laser light Beginning with the ruby laser, these instruments have quickly become an integral part of many medical specialties, including dermatology Lasers and light devices are now used in almost every area of medicine and our daily lives, including DVD and CD players, grocery store scanners, holograms, and even traffic lights
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BOX 24-1 A device is not deemed a true laser unless it ful lls three criteria: Monochromicity: the device emits light of a single wavelength Collimation: all waves travel in a single direction Coherence: all waves are in phase with each other
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