- (A) Is accomplished by soaking the casting in baking soda
- (B) Causes porosity in gold
- (C) Removes surface oxides from gold castings
- (D) Remove investment from gold casting
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- (A) Carding wax
- (B) Inlay wax
- (C) Utility wax
- (D) Sticky wax
- (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) Thin sprue
- (B) No reservoir
- (C) Investment heated strongly
- (D) Inadequate air discharge
- (A) Oxidizing zone
- (B) Reducing zone
- (C) Combustion zone
- (D) None of the above
