Nickel-chromium alloy 400 (prone to gum black lines and allergies)
Cobalt-chromium alloy 700 (not easy to produce gum black lines and allergies)
Titanium alloy 800 (the composition is similar to that of Ni-Cr, which is a means to increase the charge)
Gold alloy 1600 (good biocompatibility)
The market price of all-ceramic teeth is around 2500 (we don't seem to have it here)