Assessment of Blue-light hazard from dental curing lights
Exposure to blue-light can be an occupational health hazard which can result in a retinal photochemical injury to the eye(s) and/or an increased risk of macular degeneration. Dental curing lights produce an intense blue-light to complete the chemical reaction that produces a tooth restoration (filling). The most damaging wavelength for the retina is blue light, near 440 nm, which is within the spectral emission from dental LCUs. Some researches Â publishedÂ show Â Â thatÂ curing lights may pose a hazard to the equipment operator and other people nearby.
The aim of the study was to assess the risk of ocular damage from 6 types of light curing units (LCUs) in clinical use in Italy and Â Â to characterizeÂ appropriate protective eyewear to be used to eliminate this hazard.
The study demonstrates that high intensity dental curing lights generate exposures that exceed the limits set by the EU Â Directive on Artificial Optical Radiation . The 6 LCUs testedÂ showed potential to cause blue-light ocular damage, with damage potentially occurring after cumulative viewing of only 70 - 200Â Â seconds at the 20-cm distance for LCU. The evidence presented in this paper can be used to develop practical tips to protect workers that operate with LCU, using appropriate blue-light blocking safety glasses.
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Banca Dati Radiazioni Ottiche Artificiali