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Blue light curing units--a dermatological hazard?

R G Chadwick1, N Traynor, H Moseley

  • 1Department of Conservative Dentistry, Dental School, Dundee.

British Dental Journal
|January 8, 1994
PubMed
Summary
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Dental curing lights emit minimal ultraviolet A I (UVA I) radiation, posing a low risk to dentists' skin. Wearing surgical gloves during light curing procedures is recommended to shield against potential chemical and UVA I exposure.

Area of Science:

  • Dental Materials Science
  • Occupational Health
  • Photobiology

Background:

  • Dental materials are activated by visible blue light from curing units, which also emit some ultraviolet radiation (UV).
  • The potential dermatological effects of UV exposure on dentists' hands from curing lights are not well understood.
  • Ultraviolet A I (UVA I) radiation, specifically, has not been extensively studied in this context.

Purpose of the Study:

  • To measure the UVA I irradiance emitted by three common dental light polymerization sources.
  • To evaluate the protective efficacy of six brands of surgical gloves against UVA I radiation.
  • To assess the risk of dermatological issues for dental professionals due to UVA I exposure during light curing.

Main Methods:

  • Measured integrated irradiances in the UVA I range (340-400 nm) for Translux, Topaz T100, and Heliomat curing units.

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  • Assessed the percentage of UVA I transmission through six different brands of surgical gloves at 400 nm.
  • Evaluated glove protection in both unstretched and stretched states.

    • Main Results:

    • UVA I irradiances varied significantly among the tested curing units (Translux: 15861 mW/m², Topaz T100: 3611 mW/m², Heliomat: 305 mW/m²).
    • All tested gloves demonstrated high efficacy, with mean UVA I transmission below 4% at 400 nm.
    • One glove brand showed slightly higher transmission (7%) when stretched.

    Conclusions:

    • The risk of adverse dermatological effects from UVA I emitted by dental light polymerization units is minimal during normal use.
    • The combined effects of UVA I exposure and chemical contamination from dental materials on skin are currently unknown.
    • Routine use of surgical gloves is recommended for all light curing procedures to provide protection against both chemicals and UVA I radiation.