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Lab talk, the good, the bad, and the ugly
Zirconium
Sintering Zirconia Q&A
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<blockquote data-quote="PearlZ" data-source="post: 192215" data-attributes="member: 12965"><p>neither, it depends on the desired outcome.</p><p></p><p>any zirconia must be slow cooled for two reasons: 1. strength, rapid cooling can induce microcracks or even large-a$$ cracks if done really ridiculously too fast. 2. aesthetics. cooling quick makes it more opaque, even in already opaque zirconia. </p><p></p><p>so while it is technically possible to slow cool or fast-sinter, it generally isnt a desired option due to the nature of the material - you will note that some furnace manufacturers give a speed sinter program, but the fine print shows this is only 'indicated' for copings and single units. copings don't have to look good and singles are pittance cases. they dont want you to do it to bridges or roundhouses or big prettau thingies because they will not look good or will cost you an arm and a leg to redo and youll scream loudly on the internet that your furnace is suck.</p></blockquote><p></p>
[QUOTE="PearlZ, post: 192215, member: 12965"] neither, it depends on the desired outcome. any zirconia must be slow cooled for two reasons: 1. strength, rapid cooling can induce microcracks or even large-a$$ cracks if done really ridiculously too fast. 2. aesthetics. cooling quick makes it more opaque, even in already opaque zirconia. so while it is technically possible to slow cool or fast-sinter, it generally isnt a desired option due to the nature of the material - you will note that some furnace manufacturers give a speed sinter program, but the fine print shows this is only 'indicated' for copings and single units. copings don't have to look good and singles are pittance cases. they dont want you to do it to bridges or roundhouses or big prettau thingies because they will not look good or will cost you an arm and a leg to redo and youll scream loudly on the internet that your furnace is suck. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Sintering Zirconia Q&A
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