amalgam

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Teeth can be filled with gold; porcelain; silver amalgam (which consists of mercury mixed with silver, tin, zinc, and copper); or tooth-colored, plastic, and materials called composite resin fillings.
Mercury is present in amalgam filling, widely used by dentists, generally in the past.
ISLAMABAD -- The federal government on Thursday restricted the use of the mercury dental amalgam in children below the age of 15 and in pregnant women.
Irish Dental Association boss Dr Kieran O'Connor said: "Placing or removing amalgam fillings can cause mercury waste to be released into the environment and that is why its use is being phased down.
Dr Hame shared that she no longer uses mercury amalgams with children.
In the past several decades, major changes have occurred in both dental treatment philosophies (surgical vs medical model) (1) and direct dental restorative materials (amalgam and composite) (2) which have the potential to change the longevity of directly placed dental restorations.
43.3% did not favor providing treatment to a pregnant patient during any trimester (p=0), 46.5% considered the use of amalgam as safe during pregnancy, 70.7% supported the use of composite and glass ionomer cement, 34.4% opted for the second trimester to perform endodontic treatment while 32.1% felt it was safe to perform at any time and 35.3% reported it was safe to perform dental extractions at any time.
The mean values of thermal conductivity were obtained by four specimens of all amalgams are reported after seven days from the end of trituration as shown in Table (3).
Evidence supporting a link between dental amalgams and chronic illness, fatigue, depression, anxiety, and suicide.
Macabuhay claimed that mercury vapor emissions from the use of dental amalgam could be "substantial" and "usually exceeds general and accepted human exposure limits." She said that in one dental school in southern Mindanao, where Ban Toxics conducted one of its studies, some parts of the new building were safe from mercury vapors but that the old buildings had "significant mercury vapor emissions."
Biocompatibility of Dental Amalgams. International Journal of Dentistry 2011; article ID 981595: 7.
"These data suggest that in populations that eat fish but lack occupational exposure to mercury vapor, mercury concentrations in urine may overestimate exposure to mercury vapor from dental amalgams," said study co-author Joel Blum, PhD, also of the University of Michigan.