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Item Effectiveness of blue LED in enhancing hair treatments: Analysis in different hair ethnicities(Elsevier) Ferreira-Strixino, Juliana; Fujimoto, Priscila Vareschi Cardoso; Leite, Priscila Maria Sarmeiro Corrêa Marciano; Pinto, Juliana GuerraBlue LED has several clinical applications, including enhancing the permeation of cosmetics into hair and enhancing hair treatments. This study evaluated its efficacy in these processes in different hair ethnicities, in addition to analyzing the changes in the physicochemical properties of the hair fiber after treatment. The study used virgin hair of Caucasian, African, and Asian types free from previous chemical treatments. Different application approaches with blue LED were adopted: spot application and sweeping application. For the ana- lyses, six hair samples were prepared for each ethnic group, comprising: 1) Control without treatment; 2) Treated with leave-in cosmetic; 3) Treated with leave-in cosmetic and irradiated with blue LED in sweeping mode; 4) Treated with leave-in cosmetic and irradiated with blue LED in spot mode; 5) Untreated hair fiber irradiated with blue LED in sweeping mode; 6) Untreated hair fiber irradiated with blue LED in spot mode. Differences in cosmetic permeation into the hair strand after irradiation with blue LED were observed among different hair ethnicities. The Caucasian and Asian hair groups, when treated with cosmetics and irradiated with blue LED in the form of spot application and sweeping, showed a significant increase in cosmetic permeation, diameter, and resistance of the hair fiber compared to the African hair group.Item Photobiomodulation as a strategy to enhance argan oil permeation across diverse hair types(Elsevier) Susigan, Bianca Felippe; André, Luana Prado; Lyra, Lucas Ferreira; Sakane, Kumiko Koibuchi; Pinto, Juliana Guerra; Strixino, Juliana FerreiraPhotobiomodulation (PBM), which employs low-intensity laser light, stimulates biological processes, promoting hair growth, thickness, and regeneration without thermal damage. This study aimed to evaluate and compare the impact of photobiomodulation using amber LED combined with infrared laser on the permeation of argan oil in different types of hair fibers. The research involved samples of African and Asian hair treated with PBM and argan oil, divided into control and experimental groups. The analysis included confocal fluorescence microscopy, scanning electron microscopy (SEM), and FTIR-ATR spectroscopy, revealing significant improvements in cuticle sealing and oil permeation, particularly in Asian hair. African fibers, while showing less sealing, also exhibited notable structural changes. The infrared spectra of the samples processed using PBM with argan oil showed statistically significant differences in the regions of the Amide A, I, and II bands, which are related to the proteins in the samples. The combination of PBM with argan oil proved promising for reconditioning and protecting hair fibers, with potential applications in the cosmetic industry to meet diverse hair care needs.