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Our lab uses Sirona's inLab MCXL for milling, and have had some issues with milling zirconia crowns. We are having problems with marginal chipping during...See more the milling process. When a prep doesn't allow much space for the margin thickness we usually bulk it out a bit, but that creates a lot of extra...
We don't use sirona, however with our system we stopped using the systems tools and when with a third party. We have eliminated chipping almost totally,...See more and the tools are now in use 3 times as long. As for the chipping it might just be the mill itself. Try your spindle is it running true?
We don't use Sirona but rather Amann Girrbaach. I occasionally get a chipped margin but it is usually due to dull burs or someone touching the machine...See more during a program. If you are using fresh burs and the machine is calibrated properly, I question the quality of the bur and the spindle.
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