Older dental fillings contain form of mercury unlikely to be toxic

Older dental fillings contain form of mercury unlikely to be toxic
Older mercury-based dental fillings contain a form of mercury that scientists say is unlikely to be toxic. Credit: American Dental Association

A new study on the surface chemistry of silver-colored, mercury-based dental fillings suggests that the surface forms of mercury may be less toxic than previously thought. It appears online in ACS' journal Chemical Research in Toxicology.

In the study, Graham George and colleagues note that mercury-based fillings, also called amalgams, have been used by dentists to repair teeth for well-over a century. In recent decades their use has become controversial because of concerns about exposure to potentially toxic mercury. However, mercury can potentially exist in several different chemical forms, each with a different toxicity. Prior to this report, little was known about how the chemical forms of mercury in might change over time.

Using a special X-ray technique, the scientists analyzed the surface of freshly prepared metal fillings and compared these with the surface of aged fillings (about 20 years old) from a dental clinic. Fresh fillings contained metallic mercury, which can be toxic. Aged fillings, however, typically contain a form of mercury, called beta-mercuric or metacinnabar, which is unlikely to be toxic in the body.

The scientists found that the surfaces of metal fillings seem to lose up to 95 percent of their mercury over time. Loss of potentially toxic mercury from amalgam may be due to , exposure to some kinds of dental hygiene products, exposure to certain foods, or other factors. The scientists caution that "human exposure to mercury lost from fillings is still of concern."

More information: "The Chemical Forms of in Aged and Fresh Dental Amalgam Surfaces", http://pubs.acs.org/stoken/presspac/presspac/full/10.1021/tx900309c

Source: American Chemical Society (news : web)


Explore further

Form of Mercury in Older Dental Fillings Unlikely to be Toxic: Study

Citation: Older dental fillings contain form of mercury unlikely to be toxic (2009, December 9) retrieved 18 October 2019 from https://phys.org/news/2009-12-older-dental-mercury-toxic.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more