page_title: Crown (dentistry)
section_title: Base-metal alloys
hierarchical_section_title: Crown (dentistry) / Choice of restoration / Full metal crowns / Base-metal alloys
caption_attribution_description: English: The appearance of Stainless Steel Crowns (SSC)
context_page_description: A crown, or dental cap, is a type of dental restoration which completely caps or encircles a tooth or dental implant. A crown may be needed when a large cavity threatens the health of a tooth. They are typically bonded to the tooth by dental cement. Crowns can be made from many materials, which are usually fabricated using indirect methods. Crowns are used to improve the strength or appearance of teeth and to halt deterioration. While beneficial to dental health, the procedure and materials can be costly.
  The most common method of crowning a tooth involves taking a dental impression of a tooth prepared by a dentist, then fabricating the crown outside of the mouth. The crown can be inserted at a subsequent dental appointment. This indirect method of tooth restoration allows use of strong restorative material requiring time-consuming fabrication under intense heat, such as casting metal or firing porcelain which would not be possible inside the mouth. Because of its compatible thermal expansion, relatively similar cost, and cosmetic benefit, some patients choose to have their crown fabricated with gold.
context_section_description: Cast base-metal alloys are rarely used to make full metal crowns. They are more commonly used as part of metal-ceramic crowns as bonding alloys. When compared to high-noble and noble alloys, they are stronger and harder; they can be used in thinner sections (0.3mm as opposed to 0.5mm) however they are harder to adjust and are more likely to cause excessive wear on real opposing teeth. Furthermore, there can be a problem with people with a nickel allergy.
  Common base-metal alloys used in dentistry are:
  Silver-palladium
  Silver-palladium-copper
  Nickel-chromium
  Nickel-chromium-beryllium
  Cobalt-chromium
  Titanium
caption: Stainless Steel Preformed Crowns
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