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.Management Sciences
Category: Dental Materials
Most ideally elastic among the following_______________?
A. Polyether
B. Addition silicone
C. Polysulphide
D. Condensation silicone
Masterial causing minimum tissue distortion is______________?
A. Polysulphide
B. Silicone
C. Impression plaster
D. Zinc oxide eugenol paster
The main advantage of composites over unfilled direct filling resin is their_____________?
A. Higher solubility in saliva
B. Lower modulus of elasticity
C. Esthetic excellence
D. Lower thermal co-efficient of expansion
Which of the following provide opacity to composite ?
A. TEGDMA
B. BIS-GMA
C. Ti02
D. None of the above
Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?
A. Brittleness
B. Resilience
C. Tensile strength
D. Toughness
All of the following statements about Type II silicon impression material are true EXCEPT_______________?
A. They evolve hydrogen when cast if they are not fully cured
B. They exhibit a very low setting shrinkage
C. They have a lower tear resistance than polysulphide rubbers
D. They set by condensation polymerisation
The temperature (in °F) of the mixing slab for silicate cements should be_____________?
A. 55 – 65
B. 65 – 75
C. 75 – 85
D. 85 – 95
The point at which a stress of a material exhibits a specific limited deviation P is called_______________?
A. Proportional limit
B. Tensile strength
C. Ultimate strength
D. Yield strength
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