A. Thermal expansion
B. Hygroscopic expansion
C. Wax expansion
D. All of the above
Related Mcqs:
- The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?
A. 2.3%
B. 1.56%
C. 1.37%
D. 3% - Localised shrinkage porosity is seen when there________________?
A. Thin sprue
B. No reservoir
C. Investment heated strongly
D. Inadequate air discharge - Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
A. High quality iron
B. Chrome
C. Cobalt
D. Nickel - Flux is used during casting to________________?
A. Remove the oxides formed on the gold alloy
B. Lower the melting point
C. Replace casting wax
D. Speed the burnout process - Glossy smooth margins of a casting are due to_____________?
A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination - Incomplete casting is the result of_____________?
A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue pin
D. Large reservoir - 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 - 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 - 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 - Which zone is the hottest and efficient burning zone of the flame used for casting ?
A. Oxidizing zone
B. Reducing zone
C. Combustion zone
D. None of the above
