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Lab talk, the good, the bad, and the ugly
Porcelain
Pressed emax crack
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<blockquote data-quote="labman01" data-source="post: 21270" data-attributes="member: 566"><p>At the lab I work at, I was glazing a posterior e-max crown and I noticed a fracture across the occlusal surface. To make matters worse it was a rush case that was due in couple hours. I adjusted the glaze parameters so the final temp was 880 Celsius, temp climb 45/min, and 1:00 hold, after it came down, the crown didn't have the fracture anymore. </p><p></p><p>This crown was finished by someone else, and possibly a carbide bur was used.</p><p>The temp 880 Celsius was chosen because the pressing oven presses the ingot around 910 Celsius(not positive on exact final pressing temp),but you follow the logic in choosing temp.</p><p></p><p>Hope this helps in rush cases, I'm not sure of the consequences of doing this. I would suggest, if you have time to always re-wax.</p></blockquote><p></p>
[QUOTE="labman01, post: 21270, member: 566"] At the lab I work at, I was glazing a posterior e-max crown and I noticed a fracture across the occlusal surface. To make matters worse it was a rush case that was due in couple hours. I adjusted the glaze parameters so the final temp was 880 Celsius, temp climb 45/min, and 1:00 hold, after it came down, the crown didn't have the fracture anymore. This crown was finished by someone else, and possibly a carbide bur was used. The temp 880 Celsius was chosen because the pressing oven presses the ingot around 910 Celsius(not positive on exact final pressing temp),but you follow the logic in choosing temp. Hope this helps in rush cases, I'm not sure of the consequences of doing this. I would suggest, if you have time to always re-wax. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
Pressed emax crack
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