Which of the following refractory is used to counteract most of the expansion________________?
A. Quartz
B. Cristobalite
C. Tridymite
D. Corundum
Dental Materials
Passivating alloys are_______________?
Passivating alloys are_______________?
A. Cr, Al, Ti
B. Cr, Mo, Ti
C. Cr, Gold, Ti
D. Cr, Fe, Ti
Waxes are used for_______________?
Waxes are used for_______________?
A. Primary impression
B. Corrective impressions
C. Impression of single tooth
D. None of the above
A common electrolyte used for plating copper indirect dies is_______________?
A common electrolyte used for plating copper indirect dies is_______________?
A. Copper cynide
B. Ionic copper
C. Acidic copper sulfate
D. Silver cyanide
Stainless steel is used mostly in dentistry_________________?
Stainless steel is used mostly in dentistry_________________?
A. To strength amalgam
B. In orthodontic wires
C. To construct clasps for partial dentures
D. To replace internal gold restorations
The base constituents of dental waxes come from three main sources except______________?
The base constituents of dental waxes come from three main sources except______________?
A. Animal
B. Mineral
C. Insect
D. Vegetable
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