5 Questions
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)
What is the minimum percentage of gold in high noble metal alloys?
At least 40%
Which noble metal has the highest melting point?
Platinum
What are the properties of silver compared to gold and platinum?
White, Ductile
Which noble element plays a role in increasing tarnish resistance and hardness?
Iridium
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.
Tarnish Resistance and Hardness
- Palladium plays a role in increasing tarnish resistance and hardness in noble metal alloys.
Test your knowledge of dental casting alloys with this quiz. Learn about the classifications based on nobility and mechanical properties, as well as their applications in restorations.
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