Dental Alloys: Types, Properties, Applications
Write a short note on the Properties of Gold Alloy.
Answer:
Properties of Gold Alloy:
- Gold Alloy Color: The color of modern gold alloys can vary from gold to white. Color depends on the amount of whitening materials.
- Gold Alloy Melting Range: It is 920 to 960°C. The melting range indicates the type of investment required and the type of heating source needed to melt the alloy.
- Gold Alloy Density: Density provides the clue that a number of dental castings which are made from a unit weight of metal. By density castability of the alloy is decreased.
- Alloys with higher density should be cast better than low-density alloys.
- The density for type III is 15.5 g/cm3
- The density for type IV is 15.2 g/cm3
- Gold Alloy Yield Strength
- For type III it is 207 MPa
- For type IV it is 275 MPa.
- Gold Alloy Hardness: It shows that how easily alloys can be cut, grounded, and polished. Gold alloys are better as compared to base metal alloys.
- For type III it is 121 MPa
- For type IV it is 149 MPa.
- Gold Alloy Modulus of Elasticity: This property indicates the stiffness or flexibility of metal. Gold alloys are more flexible.
- Gold Alloy Tarnish and Corrosion Resistance: Gold alloys are resistant to tarnish as well as corrosion. This is because gold has a high noble metal content.
- Gold Alloy Casting Shrinkage: In gold alloys casting shrinkage is less as compared to base metal alloys. It ranges from 1.25 to 1.65%.
- Gold Alloy Biocompatibility: Gold alloys are biocompatible.
- Gold Alloy Casting Investment: Low-fusing gold alloys use gypsum-bonded investments.
Leave a Reply