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Bonding/cementing to existing crown
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<blockquote data-quote="JohnWilson" data-source="post: 245655" data-attributes="member: 213"><p>If the restoration can etch and the substrate can etch its easy.</p><p></p><p><img src="/forums/images/smilies/test/mad.gif" class="smilie" loading="lazy" alt="Mad" title="Mad Mad" data-shortname="Mad" />e a bunch of pressed glass to put a bandaid on fractured PFMS over the years. The acid to etch the porcelain is not something most clients have in office I have used sent the stuff we etch EMAX with in the past but I believe its not suited for the mouth.</p><p></p><p>It becomes a bit more difficult when metal is exposed especially when you do not know the composition of the alloy. There are a ton of ways around building a bondable surface with either tin plating, metal priming, then opaquing with resin before you move forward but the absolute strongest bond is glass to glass rather than glass to resin.</p><p></p><p>I took a class with Ray Bertolottii from Danville years ago on adhesive dentistry, had very little to do with what I do on a daily basis but it got me thinking more like a chemist on what to suggest when **** went wrong.</p></blockquote><p></p>
[QUOTE="JohnWilson, post: 245655, member: 213"] If the restoration can etch and the substrate can etch its easy. Made a bunch of pressed glass to put a bandaid on fractured PFMS over the years. The acid to etch the porcelain is not something most clients have in office I have used sent the stuff we etch EMAX with in the past but I believe its not suited for the mouth. It becomes a bit more difficult when metal is exposed especially when you do not know the composition of the alloy. There are a ton of ways around building a bondable surface with either tin plating, metal priming, then opaquing with resin before you move forward but the absolute strongest bond is glass to glass rather than glass to resin. I took a class with Ray Bertolottii from Danville years ago on adhesive dentistry, had very little to do with what I do on a daily basis but it got me thinking more like a chemist on what to suggest when **** went wrong. [/QUOTE]
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