A search to comprehend and explain a unique feature noticed in curly fibres in the course of experiments discovered a variety of literature that addressed many important issues. The phenotypical character of curly fibres is fully understood in the broader range of hair fibres that are highly complicated biological systems. A quick literature search yielded hundreds of research papers. Apart from the vast amount of information available on the subject, however, there were considerable variations in the research focus. Our study showed that hair biology is a complex field, and the wide range of research topics frequently causes confusion when connecting diverse aspects of the study. In the course of our literature review.
We systematically classified the components in products for curly hair studies into three fundamental subjects: looking at the reasons why hair fibres curl in the first place, what the curly fibre appears like and how the curly hair behaves. These categories were later refined into a curvature fibre model made up of distinct tiers that are successively formed that comprise the components of studies on curly hair. The aim of this paper is twofold, namely to provide (i) an overview of the literature which examines the various aspects of human scalp curly hair and (ii) using the model of curvature fibres as a systematic method to study curly hair.
A quick overview of the current and most frequently discussed topics in hair research include hair loss, growth of hair, corrective surgeries/treatments, physical and chemical properties of follicles, their morphology and functions that are genetically controlled and forensic research, and clinical research pathology. A few have studied the phenotypical characteristics of curly fibres; however, in comparison to most research, curly wool is typically an added-on to the hair research field.
The analysis described in this article was derived from an intriguing observation made in tensile research studies of hair fibres of various degrees of curl and curly hair, where the fibres lost significant amounts of rings in the process of preparation. Examining the phenomenon in the light of existing theories and findings from experiments on curly hair, a literature review identified a wide range of goals and research perspectives in the study of hair generally (all types of hair on the scalp).
It was also evident that, in most of the articles, there was a complete understanding of how the various elements under study are connected or to other aspects related to the hair fibre. This absence of interconnection is not uncommon for an interdisciplinary field. However, it can lead to unintentional associations or combinations of concepts that are not related. This is especially true for curly hair fibres, where phenotypes are usually subjectively defined in race-dependent hair.