WHat in the world is this?

shamalam

shamalam

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Forum Fam, I need help! Came in this morning to see that my little batch of sintered zirconia crowns came out super dark. I have no earthly idea what could be wrong. Havent changed anything in three years Ive been doing these. Oven issue? And by the way, I had this issue yesterday too. Except only three out of 15 came out this way.
Any suggestions?
 

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zero_zero

zero_zero

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Try to sinter a piece of known zr ( which worked previously) and see what happens... if it comes out dark, then is your furnace.
 
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