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...See more the machine is calibrated properly, I question the quality of the bur and the spindle.
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I started my career as an in-house technician in Pittsburgh, PA for my father, Dr. Richard J. Nelson, D.D.S., in 1998. From the start I learned all specialties of dental technology. In 2010 I became certified in Crown and Bridge. I now operate my own laboratory with my wife, Rebecca Nelson