What is a Curing Light?
A dental curing light is a piece of dental equipment used to cure resin-based composites using light. It’s used when providing fillings for patients. You’ll shine it directly over your patients’ teeth when giving them fillings. Blue light can also be used for other purposes, such as activating teeth whitening gel.
The light produced generates several wavelengths of light, which will vary by the type of device. It just so happens that the visible light on the spectrum is blue. Curing lights have been around since the 1960s. Older blue lights used plasma arcs or lasers, whereas tungsten halogen and light-emitting diodes (LEDs) are the curing lights most commonly used today.
What Does Blue Light Do to Teeth?
The purpose of the dentist’s UV light is to emit brightly concentrated blue light. This light tool is designed to set and cure fillings and sealants quickly. It takes only a few seconds for the light to harden your dental work.
Today, dentists use halogen or LED lights. Most dentists opt for LED lights because they avoid the problem of heating without compromising on their effectiveness. In the past, dentists had to be extremely careful when using these lights to avoid damaging the soft tissues of their patient’s mouths.
So, what does blue light do to your teeth?
When repairing a cavity in one of your patient’s mouths, you will prepare the surface by cleaning it and preparing a bondable texture. Filings made of resin will be inserted into the cleaned-out cavity and shaped according to their specific bite pattern. You’ll be attempting to match the shape of the original tooth.
Since the resin will naturally harden, you’ll need to work quickly to shape it correctly. Once you’re happy with the results, you will use your blue dental light to speed up the curing process. It only takes 20 to 60 seconds to cure the resin fully.
Once cured, your patients can return to chewing without worrying about the resin becoming misshapen or falling out.
Does Blue Light Work for Teeth Whitening?
Another use for blue light in recent years has been for teeth whitening. You may wonder why blue light is used for teeth whitening, similar to how it’s used for light curing.
Blue light itself cannot whiten the teeth. Instead, blue light is used to activate a chemical reaction. You’ll apply a specialized whitening gel to the patient’s teeth containing either carbamide peroxide or hydrogen peroxide.
The blue light activates the compounds in the gel and helps break it apart faster. It’s this chemical reaction that removes strains from the surface of the teeth. Both in-office and home whitening kits work the same way.
Research into the effectiveness of using blue light to whiten the teeth is mixed, with some studies claiming using light as an accelerant was ineffective. In contrast, other studies said it did seem to be effective.
Generally, using blue LED light in this way is considered safe, following comprehensive in vitro and clinical studies. The only risk associated with this procedure is potentially creating tooth sensitivity or irritation in the treated areas. Overall, using blue light in this way will not have any severe side effects.
Are Curing Lights Safe?
The safety of your patients is the top priority. A patient with a bad experience under your care is unlikely to return. Discomfort and dental mishaps are the number one reason why many Americans fail to visit a dentist regularly.
Blue light is ubiquitous in daily life. Practically every electronic device, from televisions to smartphones, emit blue light. Much has been made of the risks of blue light on circadian rhythms and how it could accelerate age-related macular degeneration. But how does the UV light dentist tool impact safety in the office or clinic?
Is Blue Light Bad for Your Teeth?
The answer is no. Your teeth are unaffected by being exposed to blue light. This was the case even with the older plasma-based devices with a risk of overheating. With teeth made from calcium, the risk isn’t to these rigid structures. Blue lights have a massive impact on accelerating the curing of resin-based composites, but they’re not strong enough to penetrate the teeth or cause permanent damage to soft tissues.
In the past, the main risk of using a blue light dental tool was damage to the soft tissues. Dentists of the time had to be extremely careful of how long they exposed the mouth to blue light. Overheating could lead to discomfort and injury.
LED lights are so heavily favored because they don’t produce heat. Dentists can use them without worrying about soft tissue injuries.
Much of the discussion over blue light dental tools has related to other potential injuries.
Eye Damage
While studies relating to blue light exposure to the eyes have focused on animals, there’s an argument that prolonged exposure to intense bursts of blue light can damage the eyes. This is a concern some of your patients may have.
Sufficient evidence exists that dentists should take precautions when using curing lights. In particular, eyewear designed to protect against blue light is critical for patients and dental operators.
Unfortunately, the U.S. Food and Drug Administration (FDA) has provided no information on which eyewear brand has been cleared for use. Ongoing research into safety equipment for curing lights means that no decisions have been taken on the steps dentists should take to protect their patients.
Eyeglasses are a must, but dentists can also protect their patients from risks by limiting their exposure; only using blue light dental wands for as long as necessary is the way to go.
Blue light is here to stay because it’s a vital tool of the craft, but taking steps to protect your patient’s eyes is critical to providing a safe and effective service.
How to Use the Curing Light
The issue of using a dentist curing light isn’t as straightforward as many dentists think. Most dental schools and technique articles tell practitioners to shine the light for X number of seconds to complete the process. While this is essentially the majority of the process, there’s more to it than that.
Here’s a basic rundown of choosing a curing light, their differences, and how to wield this tool.
Step One – Selecting the Right Curing Light
Over the last few years, there’s been a tremendous amount of improvement in dental curing light technology. Not all lights were created equal, so you need to know which light you should use for the task.
LEDs are the most common light available. They contain blue-only LED lights and produce light in a narrow range of 440 nm to 490 nm. You may also have come across poly-LED curing lights. These devices will create a larger spectrum of light ranging from 390 nm to 490 nm.
Since you’re using a high-powered curing light, you must avoid delivering too much exposure, which could lead to thermal damage.
Step Two – Maintaining Your Curing Light
The dental radiometer will measure the energy output of your curing lights. Most radiometers will measure the light at the tip of the guide. Aim to keep a weekly log of these values to get a baseline for how much energy your curing light is putting out.
If there’s any variation in these numbers, it indicates that there could be a problem with your curing light. Since light is measured from the tip, moving the wand away by even a tiny amount will drastically impact how much light reaches the resin-based composite in your patient’s mouth.
Make sure you’re consistent in how you’re using your curing light to ensure that you keep your numbers consistent.
Step Three – Choose the Right Tip Diameter
Rarely discussed is the importance of the tip diameter. Choosing the right tip will influence how much light actually reaches the in-mouth restoration.
In most cases, a simple 8 mm tip will meet the requirements of most procedures.
If you’re working with teeth like permanent molars, you may want to consider a broader tip to cover the whole of the restoration. You want to ensure even light curing across the teeth. The same goes when placing porcelain veneers or direct composite resin veneers.
When using a smaller-diameter tip, you’ll need several light exposures to complete the light-curing process, which means the treatment will take longer, and you could be left with an inconsistent cure.
Step Four – Prep Your Patient
Your patient should be made aware of what’s about to happen and the purpose of the blue light. The key to successful dentistry is instilling trust within your patient, so keeping them updated on what you’re about to do and why the blue light is necessary can help put them at ease.
Appropriate protective eyewear should be given to the patient and worn by yourself. With so much evidence pointing toward potential vision damage due to blue light, dental practitioners must protect their sight, considering how often they’ll use a blue light dental wand over a day.
Step Five – Shine the Light
Practically all modern dental wands can be activated by pressing a button to trigger the light. After placing the resin-based composite, you can begin shining the light over the top of the renovation.
Typically, it’ll only take a few seconds, depending on the material you’re using. Make sure you’ve confirmed in advance how many seconds it takes for the light to cure whatever material is used. The goal is to only expose the patient to enough blue light to get the job done and no more.
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