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.Management Sciences
Category: Dental Materials
Ceramics fired to metals are processed by_______________?
A. Heat pressing
B. Machining
C. Sintering
D. Slip casting
High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?
A. Have less marginal breakdown
B. Are workable at lower Hg-alloy ratio
C. Have a higher ratio of tensile to compressive strength
D. Have less resistance to tarnish and corrosion
Admixed high copper alloy powder contains_________________?
A. 9-20% copper
B. 13-20% copper
C. 9-30% copper
D. 13-30% copper
About zinc oxide eugenol all are true except_______________?
A. ZnO is converted to Zn(OH)2
B. Reaction is autocatalytic
C. Water is the byproduct of reaction
D. Dehydrated ZnO reacts with dehydrated eugenol
Which one of the following is used as filler in composite resins ?
A. Quartz
B. Silicates
C. Zinc particles
D. Aluminium
Dynamic creep is the______________?
A. Continuing alloying between silver-tin alloy and mercury during the life of restoration
B. Deformation of set amalgam during function
C. Process whereby alloy is wetted by murcury
D. Spread of amalgam during packing
What is common in amalgam and ceramics ?
A. More compressive strength but less tensile strength
B. More compressive strength and tensile strength
C. Less compressive strength but more tensile strength
D. Less compressive strength and tensile strength
Which cement base has the highest modulus of elasticity ?
A. Zinc polycarboxylate
B. Polymer reinforced ZOE cement
C. Zinc phosphate
D. Glass inomer cement
The term given to the phenomenon of moisture absorption by an alginate impression in________________?
A. Imbibition
B. Syneresis
C. Hysteresis
D. Gelation
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