Dental Casting Alloys Classification Quiz

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Questions and Answers

Which type of dental casting alloy is suitable for restorations subjected to very high stresses as long span bridges and RPD framework?

Type IV (extra hard) (correct)
Type I (soft)
Type II (medium)
Type III (Hard)

What is the minimum percentage of gold in high noble metal alloys?

More than 25%
Less than 25%
At least 40% (correct)
Exact percentage not defined

Which noble metal has the highest melting point?

Iridium
Gold
Palladium
Platinum (correct)

What are the properties of silver compared to gold and platinum?

<p>White, Ductile (A)</p> Signup and view all the answers

Which noble element plays a role in increasing tarnish resistance and hardness?

<p>Iridium (C)</p> Signup and view all the answers

Flashcards

Type IV Dental Casting Alloy

A dental casting alloy specifically designed for high-stress situations like long bridges and removable partial dentures (RPDs). Its strength ensures durability and resistance to flexing or breaking under pressure.

High Noble Metal Alloys

Gold alloys containing at least 40% gold by weight. These alloys are highly valued for their biocompatibility and corrosion resistance.

Platinum

The noble metal with the highest melting point, making it exceptionally stable and resistant to heat.

Silver (in Dental Alloys)

A white, ductile metal that is often used in dentistry to create alloys. Its properties enhance strength and aesthetics.

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Iridium

A noble element that significantly contributes to improving tarnish resistance and hardness in dental alloys, making them more durable and resistant to discoloration.

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Study Notes

Dental Casting Alloys

Type IV gold alloy is suitable for restorations subjected to very high stresses, such as long span bridges and RPD framework.

High Noble Metal Alloys

The minimum percentage of gold in high noble metal alloys is 85%.

Noble Metal Properties

Platinum has the highest melting point among noble metals.

Silver Properties

Compared to gold and platinum, silver has higher electrical conductivity, higher thermal conductivity, and lower cost, but it is more prone to tarnish and has lower strength.