With the development of oral medicine and technology,dental curing light is employed in many aspects of modern dentistry—the most conspicuous fact is it could be found in every dental clinic.Thereupon,some problems just come naturally.Which material is the best? Which type is harmless to dentists’health? Today let’s talking about the satefy awareness when using the curing light.
Before discussion,I’ll give you some data about the it.A research institution made a survey before to investigate dentists’exposure to curing light and to obtain information about the dentists’knowledge on practical use and technical features of their curing lights as well as their safety awareness in Norway,2015.The result is as showed below:
The questionnaire study identifies specific knowledge gaps among Norwegian dentists with regard to curing lights and use of personal protection. The adequately high response rate (55.8%) and the matching age and gender distribution of the respondents indicate that the present sample was representative of all PDS-employed dentists in Norway
Over the last few years, several in vitro experimental research studies have revealed the phototoxic effects of exposure to HEV. During acute exposure, mere seconds at the intensity of high-powered LEDs at close range, the result is catastrophic on a microbiologic level. The photoreceptors we need for sight are quickly damaged and shed. Within minutes, this induces a pro-inflammatory immune cascade which further damages mitochondrial DNA and in the worst case, nuclear DNA, activating programmed cell death- apoptosis. The toxic remains are engulfed by RPE cells of the retina. This damage is irreparable. Over time more cellular debris of oxidized lipids and spent vision pigment pile up at the basement membrane of the retina, creating a barrier against effective circulation in the retina. This hypoxic state, in addition to further generation of free radicals, upregulates a molecule called vascular endothelial growth factor (VEGF), This molecule signals the growth of small, leaky blood vessels through the back of the retina. Blindness can ensue.
Protecting eyes from the blue light hazard is critical as the light from LCUs can be very dangerous to eyes. The most damaging wavelength for the retina is light near 440 nm, which is within the spectral emission from dental LCUs. High levels of blue light cause immediate and irreversible retinal burning, and chronic exposure to low levels of blue light causes premature retinal aging and degeneration. To minimize ocular health risks, the operator should wear appropriate “blue-blocker” protective glasses.
Staying Safe with The Blue Light
Naturally, effective protection is key and the risks can be mitigated. Keeping aware of the blue light hazard and maintaining vigilance in the use of protective eyewear for everyone in the room will help preserve a lifetime of healthy sight. Several ophthalmic lens manufacturers have recently introduced lenses with specialized coatings that can selectively filter harmful blue light without impacting colour perception. This feature is particularly important in cosmetic dentistry. A new entry in HEV protection is a lens that is infused with natural lens melanin and ocular lens pigments to effectively block harmful HEV and UV light while allowing innocuous light to pass thereby maintaining colour and depth perception. These new lenses can also provide improved visual performance through enhanced visual acuity and contrast. Dental loupe manufacturers will start incorporating these highly protective lenses in the near future. Beyond the external protection of ophthalmic lenses, nutritional supplements containing the three naturally occurring macular pigments (Lutein, Zeaxanthin, and Mesozeaxanthin) act as internal protection by filtering harmful blue light at the retinal level while also neutralizing free radicals. These supplements are safe and do not interact with other medications While a diet rich in green leafy vegetables is a great source of macular carotenoids, most people do not get enough of these important anti-oxidants in a typical North American diet.
Blue light is here to stay and new innovations in energy efficient lighting technology will certainly increase the amount of HEV that we are all exposed to. The challenge is to understand the visual implications and to protect our eyes accordingly.
Some tips to patients & dentists
- Irradiation must not be directed towards the eyes,illumination must be restricted to the area of the oral cavity in which the clinical treatment is intended.
- Irradiation of soft tissue should be avoided as exces-sive exposure to high-intensity light may cause dam-age or irritation. If applicable, cover such areas.
- Do not use in patients with a history of photobiological reactions?or who are currently on photosensitis-ing medication (including 8-methoxypsoralen or dimethylchlorotetracycline).
- Individuals with a history of cataract surgery may be particularly sensitive to the exposure to light and should be discouraged from Elipar Trilight treatment.Treatment is appropriate if special safety measures such as the use of protective goggles to remove blue-violet and UV are undertaken.
- Individuals with a history of retinal disease should seek advice from their ophthalmologist before operat-ing the unit. This group of individuals must take extreme care and comply with any and all safety precautions (including the use of suitable light filtering safety goggles).
- The low maximum time for direct (accidental) UV/blue-light eye exposure strongly suggests that any curing lamp should be shut off at all times when not actively used
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