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    Zirconia Marginal Chipping when milling
    Christopher Nelson, CDT · Owner at Nelson Dental Laboratories

    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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