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Lab talk, the good, the bad, and the ugly
Porcelain
QUIZ: What is wrong with those crowns???
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<blockquote data-quote="robcat" data-source="post: 213959" data-attributes="member: 255"><p>I'd wager my lunch money that your ceramist grabbed the wrong porcelain. Sadly, I've seen it before, and it's easier than ever to do now that we have so many different types of substructures in the lab. The CTE difference between zirconia and standard pfm (9ish to 13ish) is just enough to blow off chunks like we see lying on your sagger tray. Again...I have berated my stupidity more than once after pulling a similar looking crown out of the oven.</p><p></p><p>Of course, most of my oven errors involve firing on the wrong program and transforming my lovely restorations into funky marbles.</p></blockquote><p></p>
[QUOTE="robcat, post: 213959, member: 255"] I'd wager my lunch money that your ceramist grabbed the wrong porcelain. Sadly, I've seen it before, and it's easier than ever to do now that we have so many different types of substructures in the lab. The CTE difference between zirconia and standard pfm (9ish to 13ish) is just enough to blow off chunks like we see lying on your sagger tray. Again...I have berated my stupidity more than once after pulling a similar looking crown out of the oven. Of course, most of my oven errors involve firing on the wrong program and transforming my lovely restorations into funky marbles. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
QUIZ: What is wrong with those crowns???
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