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Lab talk, the good, the bad, and the ugly
Porcelain
Refractory die material shofu and the shofu porcelain
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<blockquote data-quote="Contraluz" data-source="post: 334093" data-attributes="member: 3357"><p>I don't have experience with Shofu, but with GC vest. I don't think it is much different to the Shofu one. This is what I do with the GC vest: Place the refractory model in a burnout furnace and heat it up to 650 Celcius and hold it for there for about 20 min. Then put it into your porcelain furnace and heat it up to 1010 Celsius. Keep it there for another 10-15 min.</p><p></p><p>The wash 'seals' the surface of the refractory die. Again, no experience with Shofu, but after applying the wash (thin layer of neutral porcelain, in my case) I over fire the wash by maybe 40 -50 celcius, which creates a smooth surface, on which you then layer your porcelain. Don't try to do all in one firing, it will shrink excessively. You will also have to over fire the subsequent firings, too, since the refractory model absorbs heat (about 20 celsius). I'd recommend a couple trials, before going live.</p><p></p><p>I guess you have seen Pascal Magne's and Urs Belser's book. The 'bible' for refractory Veneers:</p><p></p><p>[URL unfurl="true"]https://www.amazon.com/Bonded-Porcelain-Restorations-Anterior-Dentition/dp/0867154225[/URL]</p></blockquote><p></p>
[QUOTE="Contraluz, post: 334093, member: 3357"] I don't have experience with Shofu, but with GC vest. I don't think it is much different to the Shofu one. This is what I do with the GC vest: Place the refractory model in a burnout furnace and heat it up to 650 Celcius and hold it for there for about 20 min. Then put it into your porcelain furnace and heat it up to 1010 Celsius. Keep it there for another 10-15 min. The wash 'seals' the surface of the refractory die. Again, no experience with Shofu, but after applying the wash (thin layer of neutral porcelain, in my case) I over fire the wash by maybe 40 -50 celcius, which creates a smooth surface, on which you then layer your porcelain. Don't try to do all in one firing, it will shrink excessively. You will also have to over fire the subsequent firings, too, since the refractory model absorbs heat (about 20 celsius). I'd recommend a couple trials, before going live. I guess you have seen Pascal Magne's and Urs Belser's book. The 'bible' for refractory Veneers: [URL unfurl="true"]https://www.amazon.com/Bonded-Porcelain-Restorations-Anterior-Dentition/dp/0867154225[/URL] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
Refractory die material shofu and the shofu porcelain
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