Dental scrap tested negative

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kjavanb123

Well-known member
Joined
Apr 1, 2009
Messages
1,743
Location
USA
Hi

I was given the following dental scrap, first I boiled in nitric acid for 10 minutes no reaction.

Added some hcl, reaction started and brown fumes came out.

I let that solution to simmer, and solution turns dark green which I think indication of chrome in dental alloy.

This might be helpful people who are buying dental scrap.

These are dental scrap
image.jpg

Those scraps in nitric acid
image.jpg

Finally after addition of AR, they started to dissolve, solution turned dark green.
image.jpg

There was a post suggesting try to bend the metallic section to 90 degrees of it breaks its CrCo alloy.

Thanks
KJ
 
I am sure that those denture scrap you've melted has NO precious metal content. I am working in a dental manufacturing company, so i know about it.

Is photo attached. You can easy to identity it thru color or thru document provide.
 

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As a dentist, we had a whole semester on dental materials and alloys. Most partial dentures are CrCo because it’s super hard, strong and light weight and obviously cheap.The really old gold colored ones can actually be a hard gold alloy they used to cast them out of. When gold went up a few decades ago, they came up with cheaper alternatives for cast partials and crowns and bridges.
Many porcelain fused to white metal crowns can be Au, Pd, Pt, Ag. But again some can be alloys containing Cr, Co, Ni, etc. and no precious metals because of the high cost.
 
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