PFM

Porcelain fused metal dental crowns, or PFMs as they are commonly referred to, consist of a layer of metal alloy at the base topped by porcelain. These are among the popular choices for dental restorations such as crowns or bridges. Within this category of crowns, further choice still exists catering to the budget and requirements of the patient.

PFM Crown Types

PFMs are classified according to the metal alloys being used. These are:

• High noble: Also known as precious, these consist of about 60 percent of gold or palladium or platinum. No porcelain fused metal crown can be made of pure gold as it is too soft to work with. Though this is the most expensive PFM, it is also the most reliable as far as durability is concerned.
• Noble: Also referred to as semi-precious, these have a lower content of precious metals like gold and platinum. Generally, it will be about 40 percent. This helps to bring the cost down while still maintaining a good level of strength.
• Base: Also described as non precious, these have approximately 20 to 25 percent of precious metal material while the rest is mainly nickel, chromium and others. This is the strongest metal alloy, but some people experience inflammation in the gums because of the metals used in it. However, any negative effect is localized only to the immediate area. In general, there are no systemic reactions or impact on general health. In some cases, there may be an allergic reaction to the material being used.