The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
A. 0%
B. 2 to 3%
C. 5 to 10%
D. <1%
Medical Mcqs
Function of wetting agents used in casting procedure is_________________?
Function of wetting agents used in casting procedure is_________________?
A. To felicitate wetting of ring liner
B. To felicitate mixing investment
C. To reduce contact angle of liquid with max surface
D. For better wax elimination
The deoxidizing agent added to dental alloys is______________?
The deoxidizing agent added to dental alloys is______________?
A. Palladium
B. Silver
C. Copper
D. Zinc
Which of the following is function of fluoride flux in soldering process ?
Which of the following is function of fluoride flux in soldering process ?
A. It prevents the formation of copper oxide
B. It prevents the formation of chromium oxide or dissolves chromic oxide layer
C. It prevents the flow of material in undesirable area
D. Increase the strength of solder
Percentage of gold in high noble alloy is______________?
Percentage of gold in high noble alloy is______________?
A. N 25%
B. 25%
C. >40%
D. 0%
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
A. Suckback porosity
B. Gas inclusion porosity
C. Localized shrinkage porosity
D. Microporosity
Casting flux is used to_______________?
Casting flux is used to_______________?
A. Prevent the oxidation of the metal during melting
B. increase the melting point of the flux
C. Flaring the point of the sprue attachment
D. None of the above
The main ingredient of inlay wax is__________________?
The main ingredient of inlay wax is__________________?
A. Candellila wax
B. Paraffin wax
C. Carnauba wax
D. Gum dammar
Who was the first person to introduce cast inlay restoration into dentistry ?
Who was the first person to introduce cast inlay restoration into dentistry ?
A. William H Taggart
B. Buonocore
C. G.V. Black
D. Bowen
Disadvantage of having a short sprue is________________?
Disadvantage of having a short sprue is________________?
A. Rapid solidification of metal
B. No place for reservoirs
C. Incomplete evacuation of gases
D. Difficulty in removing casting from investment