DENT MAT QUIZ 16-18

What are alloys?

• Metals used to join orthodontic wires

• Metal made by combining two or more metallic elements

• Metals used to clean dental instruments

• Metals used to fill dental cavities

What are noble metals?

• Metals that resist chemical action and corrosion

• Metals that are easily attacked by acids

• Metals that have a low melting point

• Metals that are used in orthodontic appliances

What is the purpose of palladium in dental alloys?

• To increase hardness and strength

• To prevent oxidation during casting

• To improve corrosion resistance

• To add a yellow color to the alloy

Which metal has the highest melting point?

• Gold

• Silver

• Palladium

• Platinum

What is copper in dental alloys?

• Reddish color and low melting element

• Reddish color and significantly hardens gold-based alloy

• Lines between crystals

• It is corrosion resistance

What is the role of grain refiners in dental alloys?

• To increase the size of the grains

• To decrease or reduce the size of the grains

• To prevent corrosion of the alloy

• To improve the malleability of the alloy

What is the melting range of an alloy?

• 950-1000°C

• 975-1000°C

• 980-1000°C

• 970-1000°C

What is the high density of a high noble alloys?

• Below 12 g/cm³

• Below 13 g/cm³

• Above 12 g/cm³

• Above 13 g/cm³

What is the purpose of a solder in dentistry?

• To join orthodontic wires

• To clean dental instruments

• To fill dental cavities

• To join metals or alloys

What is the difference between soldering and brazing?

• Soldering is done at a higher temperature than brazing

• Soldering is used for joining metals below 425°C, while brazing is used for joining metals above 425°C

• Soldering uses gold-based alloy solders, while brazing uses silver-based alloy solders

• Soldering is a more complex process than brazing