At McLevin Dental, we understand that patients often have questions about the materials used in dental fillings. One of the most common concerns is whether metal fillingsespecially amalgam fillingsare safe. Amalgam fillings, commonly known as silver fillings, have been used for over 150 years to treat cavities. However, in recent years, concerns have arisen regarding their safety due to the presence of mercury, one of the key components in the material.
In this blog, well dive into the safety of metal fillings, particularly amalgam, and provide you with the information you need to make an informed decision about your dental care.
What Are Metal Fillings Made Of?
Metal fillings, often referred to as amalgam fillings, are made from a mixture of metals, including silver, tin, copper, and mercury. Mercury makes up approximately 50% of the mixture, which allows the filling to be malleable when initially placed in the cavity. Once it hardens, amalgam provides a durable and long-lasting solution for filling cavities.
Amalgam fillings are typically silver in color and are commonly used in the back teeth, where they are less visible. They are known for their strength and durability, making them an ideal choice for filling cavities in areas of the mouth that endure significant pressure from chewing.
Why the Concerns About Mercury?
The main concern with amalgam fillings stems from the presence of mercury, which is a toxic substance. Mercury can vaporize and release small amounts of toxic mercury vapors over time, particularly when the filling is subjected to heat (e.g., from hot beverages) or pressure (e.g., chewing). This has led some people to question whether these fillings pose a risk to their health.
The concern is particularly relevant for people who have multiple amalgam fillings, as the cumulative exposure to mercury could be harmful. However, its important to understand that the mercury in dental amalgam is bound to the other metals in the filling and is generally considered stable once the filling is placed.
Are Metal Fillings Safe?
According to the U.S. Food and Drug Administration (FDA) and the American Dental Association (ADA), amalgam fillings are considered safe for the vast majority of patients. Multiple studies have shown that the mercury in amalgam fillings is unlikely to release harmful levels of vapor once the filling is set. The FDA classifies dental amalgam as a Class II medical device, meaning it is considered safe for use in patients over the age of 6.
However, there are certain populations that may need to take precautions:
1. Pregnant Women
The FDA recommends that pregnant women avoid getting new amalgam fillings or having existing fillings removed. While research does not conclusively prove that amalgam fillings are harmful during pregnancy, it is better to err on the side of caution. The developing fetus could be sensitive to the mercury vapor, and it is advised to avoid potential exposure during this time.
2. Young Children
Children under the age of 6 are also advised to avoid having new amalgam fillings placed. This is because their developing nervous system may be more susceptible to mercury exposure. Instead, alternatives like composite (tooth-colored) fillings may be recommended.
3. People with Mercury Sensitivity
Although rare, some individuals may be sensitive to mercury. If you have a known mercury allergy or sensitivity, its essential to inform your dentist, who may suggest an alternative filling material.
4. People with Kidney Issues
While most individuals are unaffected by the mercury in amalgam, people with compromised kidney function may want to avoid amalgam fillings due to the potential for the mercury to accumulate in the kidneys. In such cases, non-metal fillings may be preferred.
The Alternatives to Metal Fillings
If you are concerned about the presence of mercury in amalgam fillings, there are several alternative materials available. The most common alternatives are:
Composite Resin Fillings: Made from a mixture of plastic and glass, composite fillings can be matched to the color of your natural teeth, making them an aesthetic choice for front teeth. Composite fillings are also more biocompatible than metal fillings, as they do not contain mercury.
Porcelain Fillings: These are custom-made to fit your tooth and provide a natural-looking, durable restoration. Porcelain fillings are stain-resistant and can blend seamlessly with the surrounding teeth.
Glass Ionomer Fillings: These are made from a mixture of glass and acrylic and release fluoride, which can help protect the surrounding tooth from decay. Glass ionomer fillings are more commonly used in smaller cavities or for fillings in areas that arent subjected to heavy chewing pressure.
While these alternatives do not contain mercury, they may not be as durable as amalgam fillings, especially for large cavities in the back teeth. However, they are an excellent option for those who prefer a mercury-free restoration or for people with aesthetic concerns.
When Should You Consider Replacing Metal Fillings?
Most people with amalgam fillings will not need to replace them unless they are causing issues. However, you may want to consider replacing your metal fillings in the following situations:
Cracks or Fractures: If your amalgam filling cracks or becomes loose, it may no longer be providing an effective seal. This can lead to further decay and requires replacement.
Aesthetic Concerns: If youre self-conscious about the appearance of silver fillings, particularly in visible areas of the mouth, composite or porcelain fillings may be a more appealing option.
Tooth Sensitivity: If you notice increased sensitivity around your metal fillings, this could be a sign that the filling is breaking down or that decay is forming around the edges. Its important to have this checked out by your dentist.
Final Thoughts: Are Metal Fillings Unsafe?
In conclusion, metal fillings, particularly amalgam, are generally considered safe for most individuals by dental and health authorities like the FDA and ADA. While there are certain populations who should avoid themsuch as pregnant women and young childrenthe mercury in dental amalgam fillings is usually stable and poses minimal risk to most people.
If youre concerned about the presence of mercury in your fillings or if you simply prefer an aesthetic alternative, your dentist at McLevin Dental can help you explore your options. Whether you choose to keep your metal fillings or switch to tooth-colored alternatives, the most important thing is to maintain good oral hygiene, regular check-ups, and preventive care to keep your smile healthy for years to come.