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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 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 grinding time. But my question is would anyone know what might be causing the chipping of the margings when being milled? The machine is calibrated...See more once a week, and we keep the burs fresh, but still get a "choppy" result. Could it be the doctor's prep, or a malfunction with the machine? I hear word other labs don't have this luck, so I was curious as to why we might be having a problem.
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