There are a number of different dental alloys that can be used to fabricate a porcelain-fused-to-metal dental crown (PFM). And as you might expect, the physical characteristics of each alloy will play a big role in determining which is chosen. For example, clearly the metal must be strong enough so it can adequately support the porcelain that lies above without flexing. Also, the strength and predictability of that bond the metal can create with porcelain is of utmost importance.
Your dentist will probably have a strong opinion about which type of metal they will want to work with. This opinion will be based on both their knowledge and past experiences. The same classification system used to categorize alloys for all-metal dental crowns is used with PFM crown materials. They are:
You may not have much voice in choosing precisely which alloy is used to create your PFM crown but that is fine. This is really a decision for your dentist and the dental laboratory. However, you very well may need to make a decision regarding the general category of dental alloy that is chosen.
Keep in mind, noble metal alloys do cost more than the others do. Also, your dental insurance coverage may stipulate a type of alloy or provide different coverage for different classes of metals. There wouldn't be a question that a high noble alloy is always the best choice in terms of the physical properties and fit characteristics that it imparts to the crown, if your finances allow for it.
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