Structural changes of hair shaft after application of chemical hair straighteners: Clinical and histopathological study

Sanad, Eman M; Elesawy, Fatma Mohamed; Mustafa, A.I.; Agina, Hala A.

doi:10.1111/jocd.12752

Cited by 9 publications

(9 citation statements)

References 13 publications

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“…For both hair types, we observed significantly increased silkiness scores when the tresses were submitted to treatments that caused fiber alignment, which is related to a more uniform cuticle organization that is perceived by consumers when he or she touches hair (Sanad, El‐Esawy, Mustafa, & Agina, 2019).…”

Section: Resultsmentioning

confidence: 92%

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Chemical and physical damage affect the perceptions of hair attributes: A quantitative sensory assessment by a trained panel

Bloch

Valente

Escudeiro

et al. 2020

Journal of Sensory Studies

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Hair damage is caused by several chemical and physical factors. Each kind of damage affects different parts of the hair structure (cuticle and cortex) and may be noticed differently by consumers. This work aimed to assess how trained panelists perceived several types of damage to different hair types. Therefore, we prepared wavy and tight curly tresses and submitted them to standardized chemical and physical damages. A trained panel performed sensory analyses of the damaged tresses compared to virgin hair. In the analysis, the panelists assessed eight different sensory attributes: glow, silkiness, smoothness, dryness, combability, volume, frizz, and balance. The results showed that damage from UV exposure most affected the sensory attributes of hair tresses. Hair treatments that promote fiber alignment (straightening and thermal damage) had “hidden” harmful effects and attributes were noticed as if hair had improved. Practical Application Consumer's hair suffers damage daily from many sources. Most previous studies have reported the results of instrumental assessments of these damages, without considering how they are perceived by people. The current study assessed how panelists noticed hair damage from different sources to better understand damage from the consumer's point of view.

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Section: Resultsmentioning

confidence: 92%

“…Still, there were significant improvements in dryness sensation after treatment with brushing and ironing and straightening with ammonium thioglycolate . This improvement was probably associated with changes in curl conformation after straightening, as fiber alignment alters hair sensory perception (SANAD et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Chemical and physical damage affect the perceptions of hair attributes: A quantitative sensory assessment by a trained panel

Bloch

Valente

Escudeiro

et al. 2020

Journal of Sensory Studies

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“…However, these procedures use chemicals and agents like strong alkaline agents, sodium or lithium hydroxide, thioglycolates or even formaldehyde. These chemicals besides damaging the hair fibres, decreasing the fibres' mechanical properties, are a hazard for users and for the environment [33][34][35].…”

Section: Effect Of Hair Ethnicity and Hair Treatment On The Resistance To Mechanical Wearmentioning

confidence: 99%

Hair resistance to mechanical wear

Ribeiro

Martins

Tinoco

2021

Wear

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Hair mechanical properties are primary indicators of hair integrity. Here we describe a methodology based on hair's resistance to mechanical wear to evaluate cosmetic treatments. Using a vibrational vortex cycle, we developed a protocol that relies on the plastic deformation and degradation of hair, due to frictional forces between hardened steel balls and hair fragments. We demonstrate that the balls when in contact with the hair fragments promoted extended hair degradation. The degree of degradation was related to hair's resistance to mechanical wear. Lower degradation rates reflect high resistance to mechanical wear. We found differences according to hair ethnicity and type of treatment. This methodology shows great potential for the screening and evaluation of the effect of cosmetic treatments on hair.

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“…Transmission electron microscopy was performed as described previously 38 . The skin from the dorsum of Prss53 -/and WT rabbits was fixed in 3% glutaraldehyde for 4 h at 4°C.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

A direct link betweenPrss53, hair curvature, and skeletal dysplasia

Deng

Song

et al. 2019

Preprint

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In humans, protease serine S1 family member 53 (Prss53) is highly expressed in the hair follicle, especially the inner root sheath, which is associated with hair shape according to recent genome-wide association study (GWAS) data. However, no animal evidence has indicated a link between Prss53 and hair shape to date . Here, we used CRISPR/Cas9 to generate Prss53-mutated rabbits. The homozygous (Prss53 -/-) rabbits exhibited curved hair and skeletal dyskinesia with severe malformation , while the heterozygous (Prss53 +/-) rabbits did not exhibit these features. The curvature features of the hair were accompanied by lesions that were generally denser and less well-defined in the cuticular septation of the hair shaft, and the compartments of the hair follicle were incomplete, as evidenced by decreased expression levels of keratinocyte differentiation genes. In addition, skeletal dysplasia, an increased lethality rate and decreased plasma calcium and serum alkaline phosphatase (ALP) levels were determined in the Prss53 -/rabbits. Furthermore, disrupted calcium metabolism, which may play a role in the hair curvature and skeletal dysplasia of Prss53 +/rabbits, was demonstrated by using high-throughput RNA sequencing data.Thus, our study confirmed for the first time that the loss of Prss53 lead to curved hair in animals and provides new insights into the crucial role of Prss53 in calcium metabolism. Author Summary：No animal evidence has indicated a link between Prss53 and hair shape to date.The Prss53 -/rabbits exhibited curved hair and skeletal dyskinesia.The disrupted calcium metabolism may play a role in the hair curvature and skeletal dysplasia of Prss53 +/rabbits.

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Structural changes of hair shaft after application of chemical hair straighteners: Clinical and histopathological study

Abstract: Although chemical hair straightening application has a beneficial effect on hair shafts, some side effects may occur after. Hence, it is necessary to develop a more safe tool.

Cited by 9 publications

References 13 publications

Chemical and physical damage affect the perceptions of hair attributes: A quantitative sensory assessment by a trained panel

Chemical and physical damage affect the perceptions of hair attributes: A quantitative sensory assessment by a trained panel

Hair resistance to mechanical wear

A direct link betweenPrss53, hair curvature, and skeletal dysplasia

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