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Related Experiment Videos

Allergy caused by light-cured ear-moulds

B Koefoed-Nielsen1, B Pedersen

  • 1Department of Audiology, Aarhus University Hospital, Denmark.

Scandinavian Audiology
|January 1, 1993
PubMed
Summary

Allergic contact dermatitis occurred in lab technicians producing UV-light-cured acrylate ear-moulds. Further investigation is needed into materials and UV-curing processes due to patient discomfort and sensitization to methacrylates.

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Area of Science:

  • Materials Science
  • Dermatology
  • Occupational Health

Background:

  • Allergic contact dermatitis (ACD) is a significant occupational hazard.
  • Acrylate ear-moulds are used for hearing aids and other devices.
  • UV-light curing is a common method in producing polymer-based medical devices.

Purpose of the Study:

  • To investigate the cause of allergic contact dermatitis in laboratory technicians.
  • To assess patient discomfort associated with UV-light-cured acrylate ear-moulds.
  • To identify potential allergens in the production of these ear-moulds.

Main Methods:

  • Case study of three laboratory technicians experiencing ACD.
  • Patient surveys on discomfort with UV-cured and traditionally made ear-moulds.
  • Allergy testing (patch testing) on patients and technicians for sensitization to specific chemicals.

Main Results:

  • Three laboratory technicians developed ACD during the production of UV-light-cured acrylate ear-moulds.
  • Ninety patients reported similar discomfort levels with UV-cured acrylate and traditional ear-moulds.
  • Four out of seven tested patients showed sensitization to monomere methacrylates present in the wax.

Conclusions:

  • Monomere methacrylates in acrylate ear-moulds are a likely cause of allergic contact dermatitis.
  • Both laboratory handling of materials and the UV-light curing process require further investigation.
  • Potential for occupational and patient sensitization necessitates improved safety protocols in ear-mould production.

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