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<p>[QUOTE=&quot;CamaroDMD, post: 579851, member: 5233&quot;]It&#039;s all based on the application.&nbsp; Different teeth have different forces and different restorations have to do different jobs.&nbsp; The alloy selected is designed to be the best for that particular restoration.&nbsp; There are many factors to consider when choosing an alloy for a particular dental restoration.&nbsp; It has to do with not only strength, but also malleability and adaption to the tooth.&nbsp; Sometimes, a higher gold content is better because it makes the crown more easily to burnish and adapt the margin of the crown to the prepped tooth (the margin is the most likely place to have cavities form so a good sealed margin is key).&nbsp; However, if it&#039;s a visible tooth and aesthetics are needed (and thus the crown needs a porcelain face), the crown will be lower in gold content because of the temperatures needed to bond the porcelain to it.&nbsp;&nbsp; If those crowns had more gold in them...when they were heated to bind the porcelain the metal structure would melt.&nbsp; </p><p><br /></p><p>This is why the crowns are different color.&nbsp; Also, some of those might be the same alloy but have oxidized if they have gotten older and changed color.[/QUOTE]</p><p><br /></p>

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