Medical MCQs

A. Is applied to the walls of the investment to produce hygroscopic expansion
B. Increase the strength and the setting expansion of the phosphate-bonded investment
C. Acts as a retarder in the silica bonded investments
D. Acts as a refractory in the silica bonded investments

A. Gypsum bonded
B. Phosphate bonded
C. Silica bonded
D. None of the above

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

A. Carats
B. Percentage
C. Fineness
D. Gram

A. Type 1
B. Type 2
C. Type 3
D. Type 4

A. Decreasing the sprue length
B. Decreasing the sprue thickness
C. Increasing the melting temperature
D. Increasing the mould temperature

A. 2.3%
B. 1.56%
C. 1.37%
D. 3%

A. Back pressure porosity
B. Localized shrinkage porosity
C. Pin hole porosity
D. Micro porosity

A. Age hardening heat treatment
B. Annealing heat treatment
C. Homogenization heat treatment
D. Solution heat treatment

A. Type iii and type iv gold
B. Type v and type vi gold
C. Type vii and type viii gold
D. None of the above