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Lab talk, the good, the bad, and the ugly
Porcelain
Refractory onlays cracking
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<blockquote data-quote="Aldad" data-source="post: 151015" data-attributes="member: 1989"><p>Thanks for all of the suggestions. I think I have tried most of then. Some times I am able to repair with refiring after partial devesting. I also used to bake in layers from the center out, finishing with the outermost skin and margin. This is a very natural look. Still 2 or three out of 5 will crack. I really think it has the most to do with the size and shape of the prep. Unfortunately we can't control this and it is difficult to evaluate every prep, call the Dr. and reject the case.</p><p>I used to have problems with my solid dental porcelain art sculptures cracking in half when cooling. I started dropping the temp 100 degrees after final temp and holding for a couple of min. then slow cooling. this tempers the glass. art glass blowers do this to keep the glass from cracking. I started doing this on my sculptures and it works. maybe it will work on the onlays.</p><p>I think maybe I will revisit the idea of a presses emax base, then layer. Still won't look as good but sometimes the real world forces compromise!</p><p>Cheer!</p></blockquote><p></p>
[QUOTE="Aldad, post: 151015, member: 1989"] Thanks for all of the suggestions. I think I have tried most of then. Some times I am able to repair with refiring after partial devesting. I also used to bake in layers from the center out, finishing with the outermost skin and margin. This is a very natural look. Still 2 or three out of 5 will crack. I really think it has the most to do with the size and shape of the prep. Unfortunately we can't control this and it is difficult to evaluate every prep, call the Dr. and reject the case. I used to have problems with my solid dental porcelain art sculptures cracking in half when cooling. I started dropping the temp 100 degrees after final temp and holding for a couple of min. then slow cooling. this tempers the glass. art glass blowers do this to keep the glass from cracking. I started doing this on my sculptures and it works. maybe it will work on the onlays. I think maybe I will revisit the idea of a presses emax base, then layer. Still won't look as good but sometimes the real world forces compromise! Cheer! [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
Refractory onlays cracking
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