Bruzell Ellen M, Johnsen Bjørn, Aalerud Tommy Nakken, Christensen Terje
Nordic Institute of Dental Materials, Haslum, Norway.
J Occup Environ Hyg. 2007 Jun;4(6):432-9. doi: 10.1080/15459620701354218.
Exposure to intense radiation sources in a dental clinic necessitates the use of eye protective filters to avoid blue-light photochemical retinal hazard. We have investigated the filtering quality and assessed whether the filters protect sufficiently against retinal hazards throughout the workday. Visible light transmittance of 18 protective filters was measured. These products consisted of spectacles, stationary lamp shields, and a hand-held shield intended for use in dental clinics. Nine of the 18 tested filters had adequate filtering capacity according to today's lamp technology and exposure limit values. These filters transmitted less than 0.1% of the radiation at any wavelength between 400 nm and 525 nm. Seven of the nine filters showed transmission values below the detection limit (approximately 10(-3)%) in the wavelength band between 400 nm and 500 nm. Filters of inferior quality may prove inadequate if the use and radiation intensity of the lamps further increase. Lack of protection may also occur if a filter is used to protect against emission from a lamp with properties other than the lamp for which the filter has been intended. It is of major importance that the spectacles/shields accommodate the emission from the lamp source. The suppliers of dental radiation sources should be responsible for information on the need for and proper use of eye protectors. In addition, the filters should be marked according to testing procedures appropriate for the specific use.
在牙科诊所中，由于会接触到强辐射源，因此需要使用眼部防护滤光片以避免蓝光对视网膜造成光化学危害。我们研究了滤光片的过滤质量，并评估了这些滤光片在整个工作日是否能充分保护眼睛免受视网膜危害。测量了18种防护滤光片的可见光透过率。这些产品包括眼镜、固定式灯罩和一种用于牙科诊所的手持式防护罩。根据当今的灯具技术和暴露限值，18种测试滤光片中的9种具有足够的过滤能力。这些滤光片在400纳米至525纳米之间的任何波长下，辐射透过率均低于0.1%。9种滤光片中的7种在400纳米至500纳米的波段内，透过率值低于检测限（约10^(-3)%）。如果灯具的使用和辐射强度进一步增加，质量较差的滤光片可能会被证明是不够的。如果使用滤光片来防护非其设计用途灯具的发射光，也可能会出现防护不足的情况。眼镜/防护罩能够适配灯源的发射光非常重要。牙科辐射源的供应商应负责提供有关眼部保护器的必要性和正确使用方法的信息。此外，滤光片应根据适用于特定用途的测试程序进行标记。
