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.Management Sciences
Category: Dental Materials
Ultimate tensile strength refers to_________________?
A. Stress before rupture
B. Stress after rupture
C. Longitudinal compressive strength
D. Horizontal compressive strength
Which of the following is not true about elastomeric impression ?
A. Single mix material have higher viscosity
B. Shear thinning is related to viscosity of non phase impression material
C. Improper mixing of material can cause permanent deformation of impression
D. Putty – wash technique of impression reduces dimensional change of setting
The material used in its pure form in dentistry is______________?
A. Composite
B. Silver
C. Gold
D. Amalgam
When selection the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with______________?
A. Glycerin-water solution
B. Cement liquid
C. Alcohol
D. Only water
Chemical method of strengthening porcelain involves_________________?
A. Exchange of aluminium and sodium ions
B. Exchange of aluminium and potassium ions
C. Exchange of sodium and potassium ions
D. None of the above
The largest component of amalgam alloy is_____________?
A. Silver
B. Tin
C. Zinc
D. Copper
Ideal requirement of metal ceramic casting____________?
A. Low fusing ceramic and high fusing alloys
B. Matching of coefficients of thermal expansion of ceramics and alloy
C. Bonding between ceramic and alloy
D. All of the above
Type III Dental gypsum is__________________?
A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster
Incomplete casting is the result of_____________?
A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue pin
D. Large reservoir
Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?
A. Borax
B. Water
C. Sulfates
D. Carbonates
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