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.Management Sciences
Category: Dental Materials
Which one of the following is not an objective of trituration ?
A. Remove oxides from powder particle surface
B. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum
C. Pulverize pelletes into particles to aid in attack by mercury
D. Achieve a workable mass of amalgam in minimum time
Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?
A. It has increased tensile and compressive strength
B. It has poor tarnish and corrosion resistance
C. It’s edge strength is greater
D. Mercury content in the final restoration is less
Silica sol__________________?
A. Is applied to the walls of the investment to produce hygroscopic expansion
B. 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 refractory in the Silica bonded investments
Most mucostatic among the following_____________?
A. Impression compound
B. Alginate
C. ZOE paste
D. Elastomer
The most mucostatic impression material is_______________?
A. Thin mix of plaster of paris
B. Zinc oxide eugenol impression paste
C. Free flowing wax
D. Reversible hydrocolloids
Mouth temperature waxes are_______________?
A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above
The inlay wax most commonly used for direct technique_____________________?
A. Type 1
B. Type 2
C. Type 3
D. Type 4
Creep value of which of the following is the highest ?
A. Low copper amalgam alloy
B. Admix alloy
C. Single composition alloys
D. Creep value of all the above mentioned alloys is same
High copper amalgam can be produced_____________?
A. From smooth atomized particles
B. From irregular and spherical particles
C. From lathe cut particles
D. From traditional alloy particles
Which is the use of boxing an impression______________?
A. Ease of construction of denture
B. Preserving the sulci
C. Ease of pouring an impression
D. All of the above
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