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A study on light transmittance through red protective shields modified with different window films
Vanida Nimmanon1, Praewpat Pachimsawat1, Siribang-On Pibooniyom Khovidhunkit1
1Department of Advanced General Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
Objectives/Aims:
This study aimed to improve effectiveness of red protective shields in filtering unwanted light using window films.
Materials And Methods:
Red protective shields were modified by placing V-Kool (VK), Scotchtint (ST) or Hüper Optik (HP) window films on both sides. Percentage transmittance (%T) of light with a wavelength of 190-990 nm was determined using a double-beam ultraviolet (UV) and visible spectrophotometer.
Results:
In UV light (190-390 nm) and visible light (430-590 nm) ranges, %T in all modified groups and the control was below 2.5%. An increase in %T was observed at the wavelength of 630 nm, when all the modified shields showed superior effectiveness in light filtration over the control. In the infrared spectrum (700-990 nm), %T in the control was constantly high, ranging from 86 to 91%, compared to %T of 2-38% in all the modified groups, with the application of VK on both sides being the most effective group, followed by a combination of VK and HP.
Conclusion:
This study has introduced an economical and simple, yet highly effective, means of enhancing the efficiency of a red plastic protection shield in filtering unwanted infrared light, thereby additionally providing protection for dental personnel from potential ocular damages.
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