What are the three noble metals used in dentistry?

1 Answer
Feb 28, 2016

Answer:

The three noble metals used in dentistry are gold, platinum, and palladium.

Explanation:

The pure metals are never used in dentistry, because their alloys have superior properties.

There are three basic categories of dental alloys.

High noble alloys

These must contain over 60 % noble metal (#"Au, Pd, Pt"#) and more than 40 % must be gold.

A typical alloy contains 77% #"Au"#, 13% #"Ag"#, 8.5% #"Cu"#, 1.0% #"Pd"#, and less than 1% #"In, Ir"#, and #"Zn"#.

Noble alloys

These must have at least 25 % noble metal content.

A common alloy contains 40 % #"Ag"#, 20 % #"Au"#, 20 % #"Pd"#, 18 % #"In"#, 2 % #"Zn"#, and less than 1 % #"Ir"#.

Non-noble alloys

These alloys have a noble metal content less than 25 % (it may even be 0 %).

They often contain large percentages of #"Ni, Co, Cr"#, and #"Be"#.

A typical alloy contains 61 % #"Co"#, 27 % #"Cr"#, 6 % #"Mo"#, 5 % #"W"#, 1 %#"Si"#, and less than 1 % #"Mn, Fe"#, and #"C"#.