Frequently Asked Questions
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Choosing apples to apples instead of apples to oranges - if the patient has no plans on changing the existing PFM crown on 7,8...then the new crown on 9,10 should also be PFM, instead of Emax, Emax/ZCAD or Zirconia. The odds are against us in trying to exactly match the shades of 2 different products that will be side by side. Can it be done? Yes, but most likely not without multiple shading adjustments, which means duplicate patient appointments and lost profit margin for both the doctor and the lab. however, if the patient is on the fence about changing out the old PFM crown, then the Emax, Emax/ZCAD or Zirconia crown are a great approach, as the patient will be able to see the difference between old and new products
Photos are very valuable...pre-op, and/or photos that show which size, shape, shade, mind-line, and the alignment that the patient wants to follow. Please feel free to break up the tooth shades into thirds...gingival, middle, and incisal third. Photos taken with the camera phone work great...without the flash very well, however please pick the final shade at your office when the patient is present. It is very difficult for the lab to pick the final shade from 5 photos, each having a different shade guide tab in the photo.
Any information you think might be important to the lab...please include it. Please let us know if the prep is an endo tooth, or if we can trim the mesial lingual cusp tip of the opposing tooth ,or if the prep is stained, or if this crown needs to be designed to receive a future partial, or if an adjacent tooth is to be extracted, or if the pontic tooth is a recent extraction, etc.
Sometimes the triple tray can be distorted by impression tray show-through, in which the impression tray has pushed away the impression material and the tray is visible around the prep or at the most distal of the tray. Most often, this crown will exhibit a tight fit with high occlusion and will be a re-make, costing valuable chair time for the doctor and lost profits for both the lab and doctor. Two separate impressions are a fantastic work-around if the impression tray show-though happens.