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Expansion over time of the silver amalgam creates stress in the body of the dental unit. This process contributes to chipping and even deep longitudinal cracking, up to and including breaking the tooth in half. Modern white fillings have a compression process going on. It also contributes to the stress from which horizontal cracks appear.
This discussion of the dental amalgam controversy outlines the debate over whether dental amalgam (the mercury alloy in dental fillings) should be used. Supporters claim that it is safe, effective and long-lasting, while critics argue that amalgam is unsafe because it may cause mercury poisoning and other toxicity .
To fabricate an amalgam filling, the dentist uses a mixing device to blend roughly equal parts (by mass) of shavings of a silver-base alloy with mercury until the shavings are thoroughly wetted. The silver alloy is typically 40–70% Ag, 25-29% Sn, 2–40% Cu and 0–2% Zn (when the alloy is formulated Zn is a scavenger and is mostly consumed ...
Composites and amalgam are used mainly for direct restoration. Composites can be made of color matching the tooth, and the surface can be polished after the filling procedure has been completed. Amalgam fillings expand with age, possibly cracking the tooth and requiring repair and filling replacement, but chance of leakage of filling is less.
The name I used, "dental amalgam toxicity", has some problems, and should not remain. In my opinion, Safety of dental amalgam would be a good title and better than "dental amalgam toxicity", but I do not want to be the one to close this and perform the move. Right now I just want to confirm that the current title of "Dental amalgam toxicity" is ...
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