Dental casting alloys
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20 terms
Terms | Definitions |
|---|---|
 3 classes of alloys | high noble, noble, base metas |
| high noble | min=60% noble metal min=40% Au, gold soft |
| Noble | min=25% noble No Au(gold) requirement NO SPEC ON GOLD |
| Base metal | < 25% noble metal content hardest |
| % of noble metal content | add all noble % to find nobility content (Au, Pd, Pt) |
| Categorize noble metals | most prevelent alloy ie: gold based alloy, nickle based alloy color: yellow, white (not as trustworthy indicator) |
| dental casting alloy x 2 | high noble, noble |
| high noble casting alloy | most expensive, high density, no corrosion, add Cu and Ag (silver)for strength and hardness, high liquidous (hi melting point) PFM |
| noble casting alloy | harder than high noble, corrosive depending on alloy mixture |
| non-noble | base metal alloy low cost most difficult to cast high corrosion, crowns, bridges, partial dentures, dental implants, WROUGHT ALLOY (ortho wire) |
| 24 karat 12 karat | 100 % gold (x10=fine) = 1000 fine 50% gold= 500 fine |
| color >w/10% Pd | white |
| Why high noble casts better | less impurities, higher density which makes |
| Iridium, Ruthenium | grain refiners, smaller grains have increased accuracy and density of the casting |
| flux | cleans alloy of oxide borax, kf |
| high allergy | Nickle 8-18% women |
| heat noble metal heat base alloy | purify's weaken and effects grain size if heated more than twice |
| Melting range | point at which all metals in alloy are at liquidous alloy from solidoud to liquidous |
| wrought alloy | shaped into another form by mechanical force, fibrous grain structure, can revert to original grain structure if heat is applied, high Y/S |
| Solders | must have melting range lower than alloy being joined |
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