All castings are made with a metal alloy, be it non-precious, semi-precious or precious metals. Alloys are classified by their content.
- Base – contents include non-precious, Chrome Cobalt or Titanium
- Noble – consists of 25 percent precious alloy
- High Noble – consists of 60 percent precious metal with at least 40 percent being gold
Alloy type refers to the hardness and/or softness of the material.
- Type I – Extra soft
- Type II – Soft
- Type III– Hard
- Type IV – Extra Hard (Rigid)
- Non-Precious, Noble 20, White High Noble – Type IV – Very hard and rigid. These crowns are more difficult to adjust and re-polish than alloys with a high gold content.
- Full Cast 40 – Type III – Yellow high noble alloy. Brand name currently used is Argenco 40 HN.
- Full Cast 52 HN – Type III – Yellow high noble alloy. Brand name currently used is Argenco 52.
- Full Cast 75- Type III – Yellow high noble and is an upgrade from full cast 52. The gold is slightly more yellow in color. Brand name currently used Argenco 75.