What Is Dental Gold? Understanding How It Differs From Regular Gold
As you may have already guessed, dental gold is not exactly the same as regular gold. Pure gold is very malleable, and is not ideal for use in the mouth, where the forces of chewing may deform the metal.
For this reason, pure (24k) gold is not used for dental crowns or other dental work. Instead, an alloy of gold and other metals is used. These alloys are useful because they can augment the strength of gold, while maintaining its unique properties, like corrosion resistance and durability.
There are three basic types of dental gold alloy, as follows:
Precious metal (high noble alloy) – This alloy is made from a minimum of 60% high noble metal alloys, usually including gold, palladium, and platinum. 40% of the metal content must be gold
Semi-precious metal (noble alloy) – This type of alloy is made from a minimum of 25% precious metal, including gold
Non-noble alloy (non-precious metal) – Usually made from a blend of chromium, nickel, and gold, this type of alloy contains some gold, but less than 25% precious metal by weight
The higher the percentage of gold and noble metals is in the alloy, the less likely the dental work is to corrode or oxidize in the mouth. This is because gold and other noble metals are immune to corrosion and damage from oral acid.