Navigation Links
Amalgam fillings are safe, but skeptics still claim controversy, researcher says
Date:4/2/2009

AUGUSTA, Ga. 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.


'/>"/>

Contact: Paula Hinely
phinely@mcg.edu
706-721-3646
Medical College of Georgia
Source:Eurekalert  

Related medicine news :

1. ADA Comments on FDAs Settlement of Dental Amalgam Lawsuit
2. Amalgam Fillings Dont Affect Childrens Brain Development, Says Study in ADA Journal
3. Amalgam fillings dont affect childrens brain development, says study in ADA Journal
4. Materials expert denounces Norwegian ban on dental amalgam
5. Banning Amalgam Could Increase U.S. Dental Costs by $8 Billion a Year
6. Durability of dental fillings improves if the enzyme activity of teeth is inhibited
7. US FDA Admits Risks of Mercury Dental Fillings, Settles Lawsuit
8. A Patients Right to Know: Silver Fillings are 50% Mercury
9. Most comprehensive study of mercury in dental fillings begins
10. Drug-eluting stents found safe, superior to bare metal stents
11. Exercise is safe, improves outcomes for patients with heart failure
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Amalgam fillings are safe, but skeptics still claim controversy, researcher says
(Date:3/22/2017)... ... March 23, 2017 , ... Catalent Pharma Solutions, ... biologics and consumer health products, today announced that it had won the ‘Clinical ... at the Suntec Singapore International Exhibition & Convention Centre, Singapore. The award was ...
(Date:3/22/2017)... ... March 22, 2017 , ... Sam & Associates ... financial planning, and related services to residents of the region, is embarking on ... threatened species and wild lands. , Endangered Species International is committed to ending ...
(Date:3/22/2017)... ... March 22, 2017 , ... Pinnacle 1 Insurance, which serves ... community enrichment program, has announced their latest charity partner. The new campaign fundraises ... critical needs of homeless families with children for thirty years. Compassionate community contributions ...
(Date:3/22/2017)... ... March 22, 2017 , ... The American ... prior authorization (PA) form for prescribers to improve patients’ access to the revolutionary ... tools published as part of the article entitled “PCSK9 Inhibitor Access Barriers: ...
(Date:3/22/2017)... ... March 22, 2017 , ... Old School Labs™, makers of the best-selling ... a new Brand Ambassador. Theophane, who trained with Floyd Mayweather, made his professional debut ... has racked up an impressive number of wins in contests in Britain, Germany and ...
Breaking Medicine News(10 mins):
(Date:3/22/2017)... RADNOR, Pennsylvania , 22 de marzo de ... proveedor independiente global líder de soluciones de productos ... ha anunciado hoy que ha adquirido EPL Archives, ... apoya a los clientes en todo el ciclo ... y comercialización ofreciendo una muestra de archivo, almacenamiento ...
(Date:3/22/2017)... -- Research and Markets has announced the addition of ... Industry Forecast to 2025" report to their offering. ... The Global Respiratory care ... 10.9% over the next decade to reach approximately $38.27 billion by ... and forecasts for all the given segments on global as well ...
(Date:3/22/2017)...  DarioHealth Corp. (NASDAQ: DRIO), a leading global ... data solutions, today reported financial and operational results ... December 31, 2016. 2016 Highlights ... 241% compared to the full year 2015  ... entire year  Direct-to-consumer model launched ...
Breaking Medicine Technology: