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Questions and Answers
What is the classification of Pure Gold filling forms based on?
What is the primary effect of Cold Working on an alloy?
According to ADA 1984, how are Dental Alloys classified?
What is a characteristic of Eutectic Alloys?
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What is an ideal requirement of Dental casting alloys?
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Study Notes
Forms of Pure Gold Fillings
- Classified into:
- Cohesive Gold (also known as Cohesive Gold Foil)
- Mat Gold
- Electralloy
- Electrolytic Gold
Manipulating Cohesive Gold Fillings
- Steps to carry out a Class 1 filling:
- Selection of the proper tooth preparation
- Isolation of the operating field
- Wedging and condensing the gold
- Carving and finishing the gold
Cold Working
- Definition: the process of shaping or deforming metals at room temperature
- Properties changed:
- Increases hardness and strength
- Decreases ductility
- Examples in dentistry:
- Shaping dental instruments
- Forming metal matrices for direct filling gold restorations
Eutectic and Peritectic Alloys
- Eutectic Alloy:
- Definition: an alloy that has a single melting point (lowest possible temperature)
- Example: 72% Gold, 14.5% Silver, 9.5% Copper, and 4% Zinc
- Peritectic Alloy:
- Definition: an alloy that has a specific temperature at which it changes from a solid to a liquid
- Example: 75% Gold, 20% Silver, and 5% Copper
Classification of Dental Alloys (ADA 1984)
- Classified according to their nobility:
- Noble Alloys (gold, platinum, palladium)
- Semi-Precious Alloys (silver, copper, zinc)
- Base Metal Alloys (nickel, chromium, iron)
Ideal Requirements of Dental Casting Alloys
- Properties required:
- High strength and resistance to corrosion
- Low melting point and high fluidity
- Biocompatibility and non-toxicity
- Good casting properties and accuracy
- Aesthetically pleasing color
- Cost-effective and easy to manipulate
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Description
This quiz covers various aspects of metals and alloys in dentistry, including pure gold filling, cold working, and classification of dental alloys.
