Sounds like the material you got is probably just fine as is. There are many similar chemicals in all of them. Mercury seems to be the one to leach out more and build up in tissues and organs. It's accummulative, as well as one of the most toxic substances known to man. Plastics and porcelains have drawbacks, but there is not much alternative right now to amalgam. Some people however maybe very reactive to plastics and things (like sosick) and cannot have them in their mouth and may simply have to adjust their lifestyle around their amalgams and do the best they can.

If you do ok with the new materials, you'd be wise to stick with them.

The materials I had before cerec were a combination of ones. The top ones I remember were prisma composites with scotch bond.

Bottom ones. I know in two I had tetric ceram and they were later changed to filtek supreme with fuji bond. The two others I cannot quite recall, but the bond was "prime and bond".

So I've had quite a few differing ones. Reason being, the first dentist who did the top, I didn't go back to because he was not a biologic dentist and didn't use protection. The other dentist who did the bottom left didn't like using anaesthetic....(I didn't like pain) - hence I didn't go back to him. And the last were biologic dentists.

But because of my reactions following final removal and swallowing mercury, I was so ill that I didn't know what was causing what. Having different materials replaced, thinking they may have been incompatible did not really prove helpful. Even though I thought it might! Though for some it might be, my issues then were all mercury and final removal usually does cause a withdrawal and eruption of stored mercury can make your body go haywire. Sometimes the best way to find out is just getting one or two amalgams replaced first and then seeing how you go during that time. If you don't notice any real difference, (apart from possible reactin to the dental work), you can be pretty confident the new materials are most likely fine. Testing is a wise thing to do though for many of us, it may at least narrow things down more and give us an idea of what materials maybe a bit more suitable to us than others. Though it's not known how truly accurate these tests are.

But I finally and recently had my materials all redone, due to age and shrinkage and again the fact some showed incompatible on testing. But again, there really is no difference in my health. However, cerec at least will last a very long while and is probably a good long term investment. My problems now are more related to infections/virus and are proving much worse than I was with mercury (if that's even possible). I had already been healing nicely from mercury toxicity beforehand and was finally doing very well!