title: The trichotillometry: a technique for hair assessment.
abstract: BACKGROUND
  There are many different non-invasive or invasive techniques for studying the hair state either in the normal or diseased conditions.
  
  
  OBJECTIVE
  A technique is used to evaluate the current hair status through setting a normal standard value or range of the epilating force of different hair follicle types in normal individuals.
  
  
  METHODS
  The trichotillometer is used to record in grams the force exerted to epilate a single hair in different locations of scalp.
  
  
  RESULTS
  Of all the plucked hairs from all the volunteers, the epilating force, the diameter, and the follicular length were calculated. The shear strain needed for epilating different hair types is calculated.
  
  
  CONCLUSIONS
  Using the trichotillometry technique to identify the normal range of the shear strain for different hair types is important as it may aid in diagnostic, prognostic, or even therapeutic decision making for many hair diseases.
authors: Department of Dermatology, Faculty of Medicine, Beni Suef University, Beni Suef, Egypt.
authors: A A
authors: AA
authors: El-Rifaie
authors: Department of Dermatology, Faculty of Medicine, Beni Suef University, Beni Suef, Egypt.
authors: A M
authors: AM
authors: Abdel Wehab
authors: Department of Dermatology, Faculty of Medicine, Beni Suef University, Beni Suef, Egypt.
authors: Y
authors: Y
authors: Gohary
authors: Department of Dermatology, Faculty of Medicine, Beni Suef University, Beni Suef, Egypt.
authors: A E
authors: AE
authors: El-Rifaie
mesh_terms: D000293:Adolescent; D000328:Adult; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006197:Hair / Q000502:physiology*; D006204:Hair Removal / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010808:Physical Examination / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D014159:Transducers; D055815:Young Adult
keywords: epilating force; hair; normal values; scalp; trichotillometry