A crystal in metal substructure is_______________?

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. Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?

   A. 11.5-12.5×10-6/°C
   B. 10.5-11.5×10-6/°C
   C. 13.5-14.5×10-6/°C
   D. 16.5-17.5×10-6/°C

3. The solvent flux used for base metal soldering is_______________?

   A. Boric acid
   A. Borax
   B. Fluoride
   C. Rouge

4. Formula of hydroxyapatite crystal is____________?

   A. Ca3 (Po4)2 CaCo3
   B. 3Ca (Po4)2 Ca(OH)2
   C. CaPo4 Ca(OH)2
   D. None of the above

5. Non metal which conducts elactricity______________?

   A. Graphite
   B. Carbon
   C. Acrylic
   D. Porcelain

6. Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal ?

   A. Carbide bur
   B. Diamond bur
   C. Stainless steel bur
   D. Diamond but for porcelain and carbide bur for metal

7. Indium in metal alloys_______________?

   A. Improve bonding
   B. Harden the metal ceramic Ag-Pd alloy
   C. Both A and B
   D. None of the above

8. Advantage of titanium over other base metal alloys_______________?

   A. Low weight
   B. Low cost
   C. Low strength
   D. Low melting point

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

   A. 55
   B. 65
   C. 75
   D. 85

10. In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?

    A. Improve bonding
    B. Decrease porosity
    C. They react with the porcelain opaque layer, which masks the metal
    D. Improves the thermal expansion between the metal and porcelain