Amalgam fillings are safe, but skeptics still claim controversy, researcher says

Apr 02, 2009
Dental amalgam has been proven safe and effective for years, yet unfounded controversy still surrounds it, says Dr. Rod Mackert, professor of dental materials in the Medical College of Georgia School of Dentistry Department of Oral Rehabilitation. Credit: Medical College of Georgia

Dental amalgam has been proven safe and effective for years, yet unfounded controversy still surrounds it, a Medical College of Georgia researcher says.

Dentists have used amalgam, an alloy of mercury with at least one other metal, in fillings for over 200 years. Amalgam fillings don't contain enough mercury to cause potential health problems associated with larger doses, says Dr. Rod Mackert, professor of dental materials in the MCG School of Dentistry Department of Oral Rehabilitation.

"The dose makes the poison," he says, quoting 16th century Swiss physician Paracelsus. A person would need between 265 and 310 amalgam fillings before even slight symptoms of mercury toxicity could be felt. A person with seven fillings, which is average, absorbs only about one microgram of mercury daily. About six micrograms are absorbed daily from food, water and air, according to the Environmental Protection Agency.

To create a dental filling, liquid mercury dissolves and reacts with a powder of silver, tin and copper, forming a compound that contains no free mercury. "Anti-amalgam activists say mercury is soaked into metal powder, like water into a sponge, and can come back out of the fillings, but that's not at all true," Dr. Mackert says. In fact, the evaporation rate of mercury from amalgam is a million times lower than from pure mercury.

Anti-amalgam activists also say dental mercury pollutes the environment. However, dental mercury accounts for less than a quarter of a percent of mercury re-entering the environment.

Dr. Mackert presented an overview of amalgam, its controversy and its alternatives today at the 87th General Session of the International Association for Dental Research in Miami.

The amalgam controversy began in the 1970s. Awareness that dental fillings contained mercury was heightened and people were concerned by a couple of mercury-related health scares. In Japan, the release of methyl mercury into industrial wastewater caused a mercury buildup in shellfish and fish, leading to severe mercury poisoning and Minamata disease. Also, a grain covered in mercury fungicide was baked into bread and consumed in Iraq, killing hundreds. "Mercury poisoning was on people's minds and in the press," he says.

Urban legends abounded, including erroneous reports linking vapors from amalgam fillings to kidney damage and degenerative diseases such as Alzheimer's disease, multiple sclerosis and Parkinson's disease. The only documented health effects of amalgam fillings are rare allergic reactions, Dr. Mackert says, but the controversy led many people to have their fillings removed in the misguided hope of curing neurological diseases.

That controversy continues today. "It's mystifying that people persist in saying there is cause for concern with amalgam fillings when there's no evidence that they cause adverse health effects," Dr. Mackert says.

He also disputes claims that ulterior motives have influenced the American Dental Association position attesting to the safety and effectiveness of amalgam fillings. Anti-amalgam activists link the position to patent interests, but the association had only two amalgam patents, now expired, and neither was licensed, according to the U.S. Patent and Trademark Office. Most of the association's 78 patents are for white filling materials, including composite resin, an alternative to amalgam.

But composite fillings have their own problems. They cost more than amalgam and often are not covered by insurance. Numerous studies have shown that amalgam significantly outlasts composite, while composite causes more secondary cavities and may contribute to plaque formation, Dr. Mackert says.

"The bottom line is people don't need to be concerned with adverse health effects from any type of fillings - amalgam or composites," Dr. Mackert says. Since beginning his studies of amalgam in the early 1980s, his position has never changed. In fact, he has amalgam fillings himself.

Source: Medical College of Georgia

Explore further: Italian army to grow medical marijuana

add to favorites email to friend print save as pdf

Related Stories

Dental chair a possible source of neurotoxic mercury waste

Mar 26, 2008

Mercury is a large component of dental fillings, but it is not believed to pose immediate health risks in that form. When exposed to sulfate-reducing bacteria, however, mercury undergoes a chemical change and becomes methylated, ...

Recommended for you

Non-stop PET/CT scan provides accurate images

18 hours ago

Siemens is improving PET/CT imaging and data quality while reducing radiation exposure. The Biograph mCT Flow PET/CT scanner is a new positron emission tomography/computed tomography (PET/CT) system that, ...

Experts: Chopin's heart shows signs of TB

Sep 17, 2014

The preserved heart of composer Frederic Chopin contains signs of tuberculosis and possibly some other lung disease, medical experts said Wednesday.

The argument in favor of doping

Sep 17, 2014

Ahead of Friday's court ruling on whether ASADA's investigation into the Essendon Football Club was lawful, world leader in practical and medical ethics Professor Julian Savulescu, looks at whether there is a role for performance-enhancing ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Sepp
not rated yet Apr 03, 2009
"Dentists have used amalgam, an alloy of mercury with at least one other metal, in fillings for over 200 years."

I wonder - did anyone actually do a study to compare the long term health issues that face people with amalgam fillings and those who don't have any?

That would be more trustworthy than the words of a dentist who makes his money putting the stuff in people's mouths.