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Lab talk, the good, the bad, and the ugly
Metal
Metal poll
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<blockquote data-quote="Dean Mersky" data-source="post: 371" data-attributes="member: 73"><p>My experience with cast PFMs is that about 75% end up with recession, many with discoloration of the root, gingiva, tooth, or any combination. The oxides necessary to bond porcelain is a major culprit, along with corrosion and the toxic nature of "some" of the components. The latter point was published in 1997 in Germany.</p><p></p><p>I have electron micro photos of the oxide layer on hi noble and NP. The Au metal has a layer of 1 micron, while the NP has 100 microns. </p><p></p><p>You might not have had complaints about tissue and NP, and clearly not everyone reacts or reacts the same. But I can promise you that there are reactions, even with other metals. I saw it for about 20 years with a variety. That is why periodontists tell GPs to stey supra ging with cast PFMs.</p></blockquote><p></p>
[QUOTE="Dean Mersky, post: 371, member: 73"] My experience with cast PFMs is that about 75% end up with recession, many with discoloration of the root, gingiva, tooth, or any combination. The oxides necessary to bond porcelain is a major culprit, along with corrosion and the toxic nature of "some" of the components. The latter point was published in 1997 in Germany. I have electron micro photos of the oxide layer on hi noble and NP. The Au metal has a layer of 1 micron, while the NP has 100 microns. You might not have had complaints about tissue and NP, and clearly not everyone reacts or reacts the same. But I can promise you that there are reactions, even with other metals. I saw it for about 20 years with a variety. That is why periodontists tell GPs to stey supra ging with cast PFMs. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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