CEREC crowns use CAD/CAM technology which is the future of dentistry. This technology is also being used by the dental labs to fabricate crowns. It is very accurate and convenient for the patient. Your tooth is scanned and then read by the computer for fabrication. With a conventional method of making a crown, a dental impression is made of the tooth. First of all, the impression needs to be done properly to get a good imprint of the tooth and impression material is very sensitive to temperature and time. Then it is sent to a dental lab where it is poured up by a lab worker. Once again, the pour up accuracy is determined by method, temperature, and time of pour. So without getting too detailed, you can see already how more accurate a scanned impression would be of your tooth and the accuracy is going to affect the fit of the crown. When the crown is being designed on the computer, the dentist can make many changes. In my opinion, the dentist who just prepared your tooth has an advantage of being able to do the best read of the margins and do a custom design of the new crown. Even the determination of tooth shade and customization is best determined chairside rather than just sending one shade on a lab slip. We have several materials and types of porcelain that we can use with the CEREC machine which are the same choices that dental labs use. I think that you are always going to get a strong, natural looking crown ( with no metal), when you go to a dentist that can provide a CEREC crown. Be careful of the dentists that put the CEREC crowns down because it usually means they have never made one and they have not made the considerable investment and committment to the new technology that will be here to stay.