All castings are made with a metal alloy, be it non-precious, semi-precious or precious metals.
Alloys are classified by their content.
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Base – contents include non-precious, Chrome Cobalt or Titanium
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Noble – consists of 25 percent precious alloy
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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.
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Type I – Extra soft
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Type II – Soft
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Type III– Hard
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Type IV – Extra Hard (Rigid)
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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.
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Full Cast 40 – Type III – Yellow high noble alloy. Brand name currently used is Argenco 40 HN.
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Full Cast 52 HN – Type III – Yellow high noble alloy. Brand name currently used is Argenco 52.
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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.