• Zirconia Marginal Chipping when milling

    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 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...

    Most recently October 1, 2013

    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 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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