Subvisible microscale texture is present on the crista cutis of the skin and interacts with incident light to create a soft and radiant ‘shitsukan’ appearance

IF 2.5 4区 医学 Q2 DERMATOLOGY
Tatsuya Omotezako, MyriamRubecca Rodrigues, Neo Eleanor, Yu Wang, Georgina Wee, Berwyn Chong, Akira Matsubara
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Abstract

Objective

Previous studies have reported the existence of various topographic structures on the skin surface at different scales: visible and subvisible structures. Surface topography regulates the light reflection profile, and the relationship between light diffusion and human perception, such as soft appearance, has been well studied in the manufacturing industry. However, our understanding of how skin surface topography controls the optical properties of the skin surface and the appearance remains limited.

Methods

Two human studies were conducted involving healthy East Asian females. The topography of their skin was evaluated by measuring roughness parameters on skin replicas and roughness attributes on stripped corneocyte samples. These topographical attributes at different scales were compared with their perceived skin appearance, characterized by softness and radiance. Additionally, a novel image analysis algorithm to measure Crista cutis surface reflection (CSR) was developed to assess light reflection on their skin surface. The correlations of light reflection on the skin surface with these skin topographic parameters were also analysed.

Results

Through skin replica observations, attributes of subvisible microscale texture on the surface of the crista cutis were defined. This texture showed significant correlations with light diffusion on the skin surface measured as CSR, and this CSR strongly correlated with soft skin appearance and radiant skin appearance. However, neither macro-topography nor surface roughness on corneocytes showed a clear correlation with these skin attributes.

Conclusion

Subvisible microscale texture on the skin's surface is not visible to the naked eye. However, this structure plays a crucial role in regulating the optical properties of the skin's surface, which in turn leads to tangible differences in skin appearance.

Abstract Image

可见的微尺度纹理存在于皮肤的表皮上,并与入射光相互作用,创造出柔软而容光焕发的“shitsukan”外观。
目的:以往的研究报道了不同尺度的皮肤表面存在不同的地形结构:可见和亚可见结构。表面形貌调节着光反射剖面,而光扩散与人类感知(如柔软外观)之间的关系在制造业中得到了很好的研究。然而,我们对皮肤表面形貌如何控制皮肤表面的光学特性和外观的理解仍然有限。方法:对健康的东亚女性进行了两项人体研究。通过测量皮肤复制品上的粗糙度参数和剥离角质细胞样本上的粗糙度属性来评估其皮肤的地形。这些地形属性在不同尺度上与他们的感知皮肤外观进行比较,特征是柔软和光泽。此外,我们还开发了一种新的图像分析算法来测量皮肤表面反射(CSR),以评估皮肤表面的光反射。分析了皮肤表面的光反射率与皮肤地形参数的相关性。结果:通过皮肤复制品观察,明确了皮肤嵴表面亚可见微尺度纹理的属性。该纹理与皮肤表面的光扩散呈显著相关,CSR与皮肤柔软和容光焕发密切相关。然而,角质层细胞的宏观地形和表面粗糙度都没有显示出与这些皮肤属性的明确相关性。结论:皮肤表面的亚可见微尺度纹理是肉眼不可见的。然而,这种结构在调节皮肤表面的光学特性方面起着至关重要的作用,这反过来又导致了皮肤外观的明显差异。
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来源期刊
CiteScore
4.60
自引率
4.30%
发文量
73
期刊介绍: The Journal publishes original refereed papers, review papers and correspondence in the fields of cosmetic research. It is read by practising cosmetic scientists and dermatologists, as well as specialists in more diverse disciplines that are developing new products which contact the skin, hair, nails or mucous membranes. The aim of the Journal is to present current scientific research, both pure and applied, in: cosmetics, toiletries, perfumery and allied fields. Areas that are of particular interest include: studies in skin physiology and interactions with cosmetic ingredients, innovation in claim substantiation methods (in silico, in vitro, ex vivo, in vivo), human and in vitro safety testing of cosmetic ingredients and products, physical chemistry and technology of emulsion and dispersed systems, theory and application of surfactants, new developments in olfactive research, aerosol technology and selected aspects of analytical chemistry.
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