Thanks for the reply and the links Bex, this is exactly the kind of info that I was looking for. I also agree with your advice on the biocompatibility materials testing, as I think it is cheap insurance considering how many thousands of dollars it will cost to get new crowns. I need to make sure that this gets done right the first time, so that I will not be in the same position that I am in now, looking for replacement crowns again shortly down the road.

Thanks,
Jason