Dental Amalgams
What is dental amalgam?
Most people recognize dental amalgams as silver fillings. Dental amalgam is a
mixture of mercury, and an alloy of silver, tin and copper. Mercury makes up
about 45-50 percent of the compound. Mercury is used to bind the metals
together and to provide a strong, hard durable filling. After years of
research, mercury has been found to be the only element that will bind these
metals together in such a way that can be easily manipulated into a tooth
cavity. Is mercury in dental amalgam safe?
Mercury in dental amalgam is not poisonous. When mercury is combined with other
materials in dental amalgam, its chemical nature changes, so it is essentially
harmless. The amount released in the mouth under the pressure of chewing and
grinding is extremely small and no cause for alarm. In fact, it is less than
what patients are exposed to in food, air, and water.
Ongoing scientific studies conducted over the past 100 years continue to
prove that amalgam is not harmful. Claims of diseases caused by mercury in
amalgam are anecdotal, as are claims of miraculous cures achieved by removing
amalgam. These claims have not been proven scientifically.
Why do dentists use dental amalgams?
Dental amalgam has withstood the test of time, which is why it is the material
of choice. It has a 150-year proven track record and is still one of the
safest, durable and least expensive materials to a fill a cavity. It is
estimated that more than 1 billion amalgam restorations (fillings) are placed
annually. Dentists use dental amalgams because it is easier to work with than
other alternatives. Some patients prefer dental amalgam to other alternatives
because of its safety, cost-effectiveness, and ability to be placed in the
tooth cavity quickly.
Why don't dentists use alternatives to amalgam?
Alternatives to amalgam, such as cast gold restorations, porcelain, and
composite resins are more costly. Gold and porcelain restorations take longer
to make and can require two appointments. Composite resins, or white fillings,
are esthetically appealing, but require a longer time to place the restoration.
It should also be known that these materials, with the exception of gold, are
not as durable as amalgam.
What about patients allergic to mercury?
The incidence of allergy to mercury is far less than one percent of the
population. People suspected of having an allergy to mercury should receive
tests by qualified physicians, and, when necessary, seek appropriate
alternatives. Should patients have amalgam removed? No. To do so, without need,
would result in unnecessary expense, and potential injury to teeth.
Are staff occupationally exposed?
Dentists are using pre-mixed capsules, which reduce the chance of mercury
spills. And newer, more advanced dental amalgams are containing smaller amounts
of mercury than before.
An interesting factor can be brought into this: Because dental staff are
exposed to mercury more often, one would expect dental personnel to have higher
rates of neurological diseases, such as multiple sclerosis. They do not.
What are other sources of mercury?
Mercury can be found in air, food, and water. We are exposed to higher levels
of mercury from these sources than from a mouthful of amalgam.
Sources:
Much of this information was received from Jack Mitchem, DMD, professor of
dental materials at Oregon Health Sciences University Dental School and past
chairman of the American Dental Association Council on Dental Materials,
Instruments and Equipment.
AGD Impact thanks Recall, the Oregon AGD newsletter, which also contributed to
portions of this fact sheet.
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