JMN
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Intimate contact with tooth is a must, and that's why not as many docs can use them. The prep has to take undercuts into consideration from a different insertion angle than they are accustomed to thinking.This brings back another memory. The last refractory case I did, were 2 laterals out of Shofu Halo...beautiful for refractory, but they both cracked after seating. One at chair side, and the other a couple of days later. I think your post reminded me of that, or I had forgotten about the wrong cement the Dr had used.
Also, refractory should only be bonded to enamel, and not on any composite build ups, i.e it needs to be a pretty clean and specific type of prep for a refractory veneer to be used. Some dentist don't get that, and would want to use those on improper tooth structure and have failures.
So the things you're reminding me of, are kind of the things that drove me away from refractory, as emax for the general dentist, is more forgiving.
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