A. Suckback porosity
B. Gas inclusion porosity
C. Localized shrinkage porosity
D. Microporosity
Related Mcqs:
- Compared with noble metals, base metals show_______________?
A. Increased hardness
B. Increased ductility
C. Better biocompatibility
D. Increased density - A 9 year old child’s mother comes to dental clinic with the complaint of oral ulceration, fever and shedding of skin of palms and soles: she is giving history of premature shedding of teeth and increased sweating she is also giving one month history of using any new teething gel available in market. The child is suffering form____________?
A. Acrodynia
B. Pemphigus vulgaris
C. Epidermolysis Bullosa
D. Erosive lichen planus - Tublulence of molten gold is due to _____________?
A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above - Ceramics fired to metals are processed by_______________?
A. Heat pressing
B. Machining
C. Sintering
D. Slip casting - When two metals are completely miscible in liquid state and they remain completely mixed on solidifiation, the alloy formed is called________________?
A. Solid solution
B. Eutectic mixture
C. Peritectic mixture
D. Inter metallic compounds - 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 - Asbestos liner is used in a casting ring to________________?
A. Facilitate venting of the mold
B. Retard the heating of the investment
C. Permit expansion of the world
D. All of the above - Air bubbles formed on the surface of casting is probably due to________________?
A. Improper casting pressure
B. Improper heating of the investment
C. Improper angulation of sprue
D. Improper wetting of the wax pattern by the investment - 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 - Which of the following fuel gases used for soldering, has the highest heat content______________?
A. Hydrogen
B. Natural gas
C. Acetylene
D. Propane
