The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

Related Mcqs:

1. The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?

   A. More
   B. Less
   C. Equal
   D. Depends on the alloy type

2. Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?

   A. Platinum
   B. Copper
   C. Silver
   D. Gold

3. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?

   A. 80 Mpa
   B. 140 Mpa
   C. 260 Mpa
   D. 510 Mpa

4. Crucible indicated for casting base metal alloys is______________?

   A. Carbon crucible
   B. Clay crucible
   C. Quartz crucible
   D. High melting plastic crucible

5. Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?

   A. Chromium
   B. Indium
   C. Irridium
   D. Palladium

6. The ADA specification No 1 for composition of amalgam alloy recommends______________?

   A. 65% silver, 32% tin and 3% copper
   B. 49% silver, 32% tin and 19% cooper
   C. 65% silver, 29% tin and 5-6% copper
   D. None of the above

7. ADA specification number of gypsum products are described under____________?

   A. 1
   B. 4
   C. 12
   D. 25

8. The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?

   A. 19
   B. 20
   C. 21
   D. 26

9. In type II gold alloys _______ Karat gold is used?

   A. 24 K
   B. 22 K
   C. 18 K
   D. 10 K

10. Addition of large amounts of platinum to a casting gold alloy will________________?

    A. Decrease its strength and ability to be hardened
    B. Decrease its tarnish resistance
    C. Increase its fusion temperature
    D. Redden the alloy