Which of the following is a noble metal used for dental casting alloys?

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Platinum,palladium,and gold are noble metals used for dental casting alloys.The primary base metals used in casting alloys are copper,nickel,silver,zinc,tin,and titanium.Copper and silver are often added to gold alloys to increase their hardness.Zinc is added to reduce oxidation when the alloy is cast.Because of their low cost,base metals have also been called nonprecious metals.Although they are not considered to be as good as the noble metals,the base metals are essential for many applications in dentistry.

Which of the Following Is a Noble Metal Used for Dental