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.Management Sciences
Category: Dental Materials
Heat hardening is the process done at_______________?
A. Heating 750°C and slowly cooling to zero degree
B. Heating quickly upto 450°C followed by sudden quenching
C. Heating upto 250°C for 15 to 30 min
D. Heating at 750°C and then quenching to room temperature
Which of the following impression material is rigid ?
A. Zinc oxide-eugenol
B. Reversible hydrocolloid
C. Alginate
D. Polysulphide rubber
The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?
A. Compressive strength
B. Tensile strength
C. Young’s modulus
D. Modulus of elasticity
Binder used in Gypsum investment is_________________?
A. Silica
B. Quartz
C. Cristobolite
D. Calcium sulphate monohydrate
Porosity in porcelain at condensation stage depends on_________________?
A. Shape and size of particle
B. Uniform distribution of particle size
C. Number of particles
D. None of the above
Titanium casting is done_____________?
A. Under vacuum in argon atmosphere
B. Under air pressure in nitrogen atmosphere
C. In specially fabricated aluminium vanadium
D. Using CAD-CAM technique
Which of the following is true about Agar hydrocolloid impression material ?
A. Liquefies between 71 – 100°C
B. Solidfies between 50 – 70°C
C. Facilitates fabrication of metal dyes
D. Cannot register fine surface details
The setting of zinc phosphate may be retarded by ?
A. Increased in the ratio of powder to liquid
B. Diluting the liquid with water
C. Increase the addition of powder to liquid
D. Decrease the addition of powder to liquid
Alginates are made dust free by adding______________?
A. Glycol
B. Glyecrol
C. Glutamic acid
D. alcohol
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
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