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Lab talk, the good, the bad, and the ugly
Zirconium
Question on Glazing Zirconium.
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<blockquote data-quote="ztech" data-source="post: 343068" data-attributes="member: 3022"><p>I can't answer the question about the glazing oven, but I can give you the facts about the zirconia. Zirconia needs to be cooled in a controlled fashion. The optimal cooling rate for singles is 45 degrees per minute to 450 degrees. At that point you can remove from the oven. The cooling for a larger the bulk of zirconia the slower it must be cooled. Full arch restorations I cool at 20-25 degrees a minute to 450. Yes it takes a long time but the failure for the ones not cooled slowly can be a catastrophic failure. I started on the search for answers after a Procera anterior implant split in half on the cooling tray shortly after removing from the oven.</p><p> I am not a salesman for Zubler or Ivoclar but if you are doing a lot of zirconia firings you should be using an oven similar to those two. They have a precise cooling program just for the zirconia.</p><p></p><p>[URL unfurl="true"]https://www.researchgate.net/publication/317819159_The_effect_of_different_cooling_rates_and_coping_thicknesses_on_the_failure_load_of_zirconia-ceramic_crowns_after_fatigue_loading[/URL]</p></blockquote><p></p>
[QUOTE="ztech, post: 343068, member: 3022"] I can't answer the question about the glazing oven, but I can give you the facts about the zirconia. Zirconia needs to be cooled in a controlled fashion. The optimal cooling rate for singles is 45 degrees per minute to 450 degrees. At that point you can remove from the oven. The cooling for a larger the bulk of zirconia the slower it must be cooled. Full arch restorations I cool at 20-25 degrees a minute to 450. Yes it takes a long time but the failure for the ones not cooled slowly can be a catastrophic failure. I started on the search for answers after a Procera anterior implant split in half on the cooling tray shortly after removing from the oven. I am not a salesman for Zubler or Ivoclar but if you are doing a lot of zirconia firings you should be using an oven similar to those two. They have a precise cooling program just for the zirconia. [URL unfurl="true"]https://www.researchgate.net/publication/317819159_The_effect_of_different_cooling_rates_and_coping_thicknesses_on_the_failure_load_of_zirconia-ceramic_crowns_after_fatigue_loading[/URL] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Question on Glazing Zirconium.
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