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Why is it problematic to change large old amalgam fillings to composite fillings?
Wiki User
∙ 15y ago
It is problematic to change old large amalgam fillings to composite fillings because there may not be enough tooth structure left to support the new filling. If this is the case, the tooth will probably fracture soon after the new filling is placed. A better, safer alternative in this situation would be to place a porcelain crown instead of a filling.
Wiki User
∙ 15y ago
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What are the symptoms of aluminum poisoning?
It has never been demonstrated that there any such thing as 'amalgam poisoning'. In extremely rare cases, people have been shown to be allergic to one or more components of amalgam, but that is not the same as amalgam poisoning.There are numerous websites and publications that try to make the claim that amalgam is toxic and dangerous. Nevertheless, the empirical evidence indicates amalgam fillings are extremely safe and adequate as dental restorations.Consider this: Over the past 150 years, there have literally been billions of amalgam fillings placed in hundreds of millions of teeth in hundreds of millions of mouths throughout the world. If there was a significant health risk associated with amalgam fillings, it would have shown up by now at least in the millions. This simply is not the case.If amalgam fillings were the cause of even half of what many people claim, it would be simple enough to demonstrate. All that would have to be done is collect health data on a few thousand people who have amalgam fillings. Then do the same with a few thousand people who have never had amalgam fillings. Then compare the data from the two groups. After allowing for age, sex, race, geography, and nutrition, if amalgam fillings are responsible for anything from Alzheimer's to Aids to Zebra stripes, it will show up clearly in the amalgam group and not in the control group. If not, then amalgam fillings are not the culprit.Take the advice of Consumers Union who did an in-depth investigation into the claims that amalgam fillings were dangerous: If a dentist tells you all your amalgam fillings need to be replaced due to toxicity or some obscure medical condition, hold on to your wallet. The dentist is trying to line his pockets with gold. An "amalgam" is made from mercury mixed with other metals (silver, zinc, etc), and mercury poisoning is not all that rare. If something has been used over 150 years, those that use it are not going to be extremely willing to change. If your dentist suggests you replace your fillings, but all means consult other experts, but include a medical doctor. You may be one of those 'rare' persons whose exposure to even a small amount of mercury is a serious health risk.
Is separating iron fillings from sand a chemical change?
no... physical
Is mixing iron fillings with sand a physical change?
It is not a chemical change. The iron and sand can be separated out.
Can you change composite numbers to prime numbers?
No, You can't change a composite number to prime number.
Which of these is not a way to deal with a problematic co-workers?
confront the co-worker and try to change the annoying behavior.
Main components of amalgam?
Physical Properties of Amalgam. The most important physical properties of amalgam are flow and creep, dimensional change, and strength.(1) Flow and creep. Flow and creep are characteristics that deal with anamalgam undergoing deformation when stressed. The lower the creep value of anamalgam, the better the marginal integrity of the restoration. Alloys with high coppercontent usually have lower creep values than the conventional silver-tin alloys.(2) Dimensional change. An amalgam can expand or contract dependingupon its usage. Dimensional change can be minimized by proper usage of alloy andmercury.(3) Compression strength. Sufficient strength to resist fracture is animportant requiand the degree of porosity in the amalgam restoration.rement for any restorative material. At 50 percent mercury content, thecompression strength is approximately 52,000 pounds per square inch (psi). Incomparison, the compressive strength of dentin and enamel is 30,000 psi and 100,000psi, respectively. The strength of an amalgam is determined primarily by thecomposition of the alloy, the amount of residual mercury remaining after condensation,MD05021-6
How do you change a 2003 Honda rebel 250 oil filter?
there is no oil filter! just a magnet to catch fillings in pan. what is the capacity of oil
How can you make your composite bat better?
your gonna have to remake the whole thing, you cant just take layers of the composite materials off or change them etc.
What happens after mixing sand and iron fillings?
well because sand are little grains of sandstone it means that they wont stick to magnets so i would suggest that you got a magnet an ran it over the sand and iron fillings so that the iron fillings would stick to the magnet that would mean they would be separated loll
What happens when a iron nail is put in mercury?
When an iron nail is placed in mercury, a reaction called amalgamation occurs. The iron atoms from the nail react with the mercury atoms, forming an alloy called an amalgam. The iron nail gets coated with a layer of amalgam, which can make the nail appear silver-like and can change its properties.
Why won't my Nikon sb 600 flash?
You have got to change your camera to flash! There is some sort of button that you press to solve your problematic problem. xo
Why the mixture of the metal fillings and sulfur becomes chemical change when heat was applied?
Applying heat to the mixture causes a chemical reaction to occur: 2Fe + 3S -> Fe2S3
