Sub surface porosity can be decreased by_______________? A. Decreasing the sprue lengthB. Decreasing the sprue thickness C. Increasing the melting temperature D. Increasing the mould temperature
The inlay wax most commonly used for direct technique_____________________? A. Type 1 B. Type 2 C. Type 3 D. Type 4
The purity of gold is expressed in________________? A. Carats B. PercentageC. Fineness D. Gram
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.…
Investment material used for cobalt-chromium alloys is_____________? A. Gypsum bondedB. Phosphate bonded C. Silica bonded D. None of the above
Silica sol__________________? A. Is applied to the walls of the investment to produce hygroscopic expansionB. 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…
Boxing wax is also called as________________? A. Carding wax B. Inlay wax C. Utility wax D. Sticky wax
Shape memory in NiTi is because of stress induced form__________________? A. Austenite to martensite B. Martensite to austenite C. Ferrite to austenite D. Austenite to ferrite
Casting shrinkage is compensated by_______________? A. Thermal expansion B. Hygroscopic expansion C. Wax expansionD. All of the above
The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________? A. 55 B. 65C. 75 D. 85