A. Thermal changes
B. Thickness of the resin
C. Lack of temperature
D. Packing past the dough stage
Related Mcqs:
- Subsurface porosity is due to_____________?
A. Thermal changes
B. Thickness of the resin
C. Lack of temperature
D. Packing past the dough stage - In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
A. Throughout the denture
B. Near the borders
C. In the thickest part
D. On the denture surface - Porosity of denture base is due to_______________?
A. Packing at dough stage
B. Curing at 160°F for 9 hrs
C. Inadequate pressure
D. All of the above - 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. Pinhole porosity
B. Gas inclusion porosity
C. Micro porosity
D. Subsurface porosity - Suck back porosity is due to_________________?
A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature - Discolouration of silver alloy is due to_____________?
A. Tarnish
B. Tarnish and corrosion
C. Wet corrosion
D. Dry corrosion - 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 - If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
1. Hard thick central area
2. Thin Palatal area
3. Thin area of flanges
4. Porosity is uniformly distributed - Porosity present in a acrylic denture is usually the result of______________?
A. A prolonged curing cycle
B. Lack of sufficient pressure applied to flask
C. Insufficient acrylic resin monomer
D. Prolonged bench cooling after curing - To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
A. Cold water
B. Hot water
C. Under tap water
D. Under vacuum pressure
