Composition:
Gold 77%
Palladium 1%
Silver 13.5%
Copper 8%
Zinc 0.5%
Balance Ir
Color: Yelow
Applications: DE ORO 77 is a high noble, yellow colored, Type II medium hard cast gold dental casting alloy. It is designed for use in crowns, inlays, M.O.D.'s, veneer crowns, 3/4 crowns and short span bridgework.
Physical
Properites:
| Casting Temperature | 1850F (1010C) |
| Melting Range | 1652-1725F (900-940C) |
| Density (gm/cc) | 15.8 |
| Vickers Hardness | 135 |
| Tensile Strength | 58,000 psi |
| Yield Strength | 27,000 psi |
| Elastic Modulus | 12,000,000 psi |
| Elongation(%) | 38 |
Recommended Processing:
| Recomended Solders | 650 |
| Recommended Investment | GB |
Spruing:
Single units - Direct method with 8 ga. sprues and adequate resevoirs.
Multiple Units - Indirect Method with runner bars and 8 ga. sprues.
Investment: Use a low-heat gypsum-based investment following the manufacturer's instructions.
Burnout: After adequate set-up time, place ring(s) in oven at room temperature and raise temperature to 1200F (650C) and hold for 1 hour. Add ten minutes for each additional ring.
Melting and Casting: De Oro 77 has a casting temperature of 1850F(1010C). An air/gas torch with multiorifice tip and a white flux are recommended. Clean buttons may be remelted with 50% addition of new alloy. Do not overheat the alloy.
Preparing Framework: Casting may be blasted using aluminum oxide. Pickle with a good pickling acid. Shape, finish and polish.
Soldering:Use 650 solder with a paste flux and an air/gas torch.
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