The base constituents of dental waxes come from three main sources except______________?
A. Animal
B. Mineral
C. Insect
D. Vegetable
Metallurgy
The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?
The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?
A. Utility wax
B. Base plate wax
C. Beading wax
D. Boxing wax
The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?
The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?
A. hole porosity
B. Gas inclusion porosity
C. Micro porosity
D. Subsurface porosity
Function of carnauba wax_________________?
Function of carnauba wax_________________?
A. To provide a smooth and glossy surface
B. Increase toughness
C. Decrease toughness
D. Decrease flow at room temperature
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
A. Platinum
B. Copper
C. Silver
D. Gold
Softening heat treatment of alloy increases_________________?
Softening heat treatment of alloy increases_________________?
A. Tensile strength
B. Proportional limit
C. Ductility
D. Hardness
The function of a sprue is to_______________?
The function of a sprue is to_______________?
A. Form an opening of molten metal to enter the mold
B. Help polish cast restorations
C. Eliminate air bubbles on the wax pattern
D. Reproduce fine detail
Stabilization of stainless steel is achieved by adding____________?
Stabilization of stainless steel is achieved by adding____________?
A. Carbon
B. Chromium
C. Nickel
D. Titanium
The yield strength of AUstenite (NiTi alloy) is______________?
The yield strength of AUstenite (NiTi alloy) is______________?
A. 100 Mpa
B. 240 Mpa
C. 560 Mpa
D. 700 Mpa
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
A. Dimensional change
B. Thermal conductivity
C. Warpage
D. Tarnish and corrosion