why are you in my forum arguing this? why on earth would you want an estrogeneric filling? i would never recommend a filling with BPA over one without those type of toxic ingredients, even if they are not quite as strong. however, i do believe diamondcrown to be one of the strongest white fillings on the market, no matter what your claims are. i said nothing about porcelain, gold or amalgam. porcelain and gold are considered permanent restorations, so of course they are going to last longer. amalgam is to be replaced every 8 years according to the ADA because it galvanizes and pits and cavities get underneath. plus, it is a toxic health hazard.