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    Co-Cr alloy which doesn’t contain Ni or Be belongs to biological alloy, This kind of metal has well metal stability and corrosion resistance. The symptom, gum inflammation or allochromasia and so on, won’t be happened basically.The fee of PFM Co-Cr is lower than Noble PFM’s,at the same time the PFM Co-Cr is more safe than Non Noble PFM, become typical biological alloy PFM with many advantages like aesthetics, economy, durable and so on.