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Skin replica, to assess the orientation and depth of wrinkles.
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3D Reconstitution of face skin surface, using beam of fringes
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Close observation of the surface of human skin, over the whole body, reveals a relief featuring a great many forms of considerably different shapes and sizes. This microrelief is a marker of ageing and methods of topographical mapping have proved invaluable for assessing the skin and the efficiency of cosmetic products. A preliminary and essential step, to any study of the relief, is the preparation of a mould or a print. Easy and rapid to obtain, polysilicone or araldite replica must be extremely accurate, since it will be studied by profilometry or a scanning microscope
. The principle is to scan the replica
or skin surface, using one or two light beams, or a grazing incidence light and to measure both the cast shadows and the deformation of a beam of fringes. Wrinkle orientation, density and depth can be plotted, and of course efficiency of cosmetics designed to attenuate wrinkles and fine lines, measured.
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