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Medical Forum / General / Dentistry / January 2008question about CEREC and occlusion
I've had two adjacent lower molars crowned using CEREC (the machine was the 3D model, the latest model when I had the treatment done). The first crown was of a molar that was complete, but in the second, part of the tooth had broken off, so the dentist didn't bother taking photographs of the tooth itself, just the teeth in the opposing jaw. I'd expected the occlusion to be perfect as soon as the crown was fitted, but in both cases, the tooth felt way too big, the occlusion was very bad indeed, and the dentist had to do a lot of adjustment. The strange thing was, in addition to drilling away some of the crown, he also drilled away some (quite a lot, it felt) of the opposing tooth (I seem to remember him mentioning something about a cusp on the opposing tooth being rather large). This happened with both crowns, which were done by the same dentist, a couple of years apart. I was under the impression that the CEREC 3D machine copies your tooth to within a few microns, so why should there have been any need for any drilling at all? And why drill the opposing tooth down? Because CEREC you can read and write up side down with wery the same effect, but "R" still remains the same: rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr....... -- All the best, Proka ~ The cynic says I will crush you with my power - the healer says I be love for you with all my might ~ > I've had two adjacent lower molars crowned using CEREC (the machine > was the 3D model, the latest model when I had the treatment done). [quoted text clipped - 16 lines] > to within a few microns, so why should there have been any need for > any drilling at all? And why drill the opposing tooth down? The amount of post-insertion adjustment is proportional to the settings on the machine. Your dentist may choose to get it close and then final adjust and shape in the mouth. Perhaps your unique condition necessitated doing this way. Perhaps, your opposing tooth had shifted out of position and needed to be re-contoured. Who knows from a monitor? I set my machine to leave a few microns of adjustment after insertion so I can verify where the teeth touch. I can just as easily set it so that there is no contact at all. I prefer to do 1-3 touches with carbon paper and trimming to fine tune the contacts. Just my preferences. Often teeth needing this type of restoration have been victim of less than perfect contours for many years, causing teeth to shift position. This generally requires the opposing tooth be re-shaped to harmonized the dynamic process of occluding.  Signature/ Amatus / > I've had two adjacent lower molars crowned using CEREC (the machine > was the 3D model, the latest model when I had the treatment done). [quoted text clipped - 16 lines] > to within a few microns, so why should there have been any need for > any drilling at all? And why drill the opposing tooth down? |
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