Lee S Y, Choi A R, Baek J H, Kim H O, Shin M K, Koh J S
Dermapro LTD, Skin Research Center, Seoul, Korea.
Department of Dermatology, Kyung Hee University Hospital, Seoul, Korea.
Skin Res Technol. 2016 Nov;22(4):406-411. doi: 10.1111/srt.12279. Epub 2016 Jan 21.
To assess the hair surface condition, scanning electron microscope (SEM) is commonly used and it remains an indispensable hair morphology characterization technique. Yet, the technique is criticized for having subjective viewpoints and limitations in distinguishing the appearance of cuticle layers.
The aim of this study is to establish an objective classification system and also to subdivide by detailed description of damaged cuticle layers.
Hair samples were collected from female subjects (n = 500) who participated in hair efficacy study and Asian hair bunches (n = 180) that were previously collected. Damage to hair was initiated by chemical, heat stress and ultraviolet irradiation. We suggested the grading criterion on a 12-point scale and compared with a wide range grading system on a 5-point scale. We evaluated other hair surface-related parameters such as hair luster-ring and combing load to verify the validity and efficacy of our new grading system.
The grading criterion on our 12-point scale revealed an improved discrimination compared to the wide range grading system. Hair surface-related parameters were significantly improved after hair care product, and these tendencies were likely to be determined to be similarly improved using the 12-point scale grading system.
The 12-point scale classification system was demonstrated to be a more precise standardization and appropriate evaluation method to investigate the subtle distinction of the hair shaft after hair care product application.
为了评估头发表面状况，扫描电子显微镜（SEM）被广泛使用，并且它仍然是一种不可或缺的头发形态表征技术。然而，该技术因具有主观观点以及在区分角质层外观方面存在局限性而受到批评。
本研究的目的是建立一个客观的分类系统，并通过对受损角质层的详细描述进行细分。
从参与头发功效研究的女性受试者（n = 500）以及先前收集的亚洲发束（n = 180）中采集头发样本。通过化学、热应激和紫外线照射引发头发损伤。我们提出了一个12分制的分级标准，并与一个5分制的广泛分级系统进行比较。我们评估了其他与头发表面相关的参数，如头发光泽环和梳理负荷，以验证我们新分级系统的有效性和功效。
与广泛分级系统相比，我们的12分制分级标准显示出更好的区分度。使用护发产品后，与头发表面相关的参数有显著改善，并且使用12分制分级系统可能会确定这些趋势有类似的改善。
12分制分类系统被证明是一种更精确的标准化和合适的评估方法，用于研究使用护发产品后发干的细微差别。
