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.Management Sciences
Category: Dental Materials
The function of 2% potassium sulphate in a gypsum product is_____________?
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A. To regulate the setting expansion
B. Regulate setting time
C. Acts as retarder
D. None
Agar impression materials differ from alginate impression materials in that the former sets by_______________?
A. Mechanical action of saliva
B. Physical change
C. Evolution
D. Chemical change
The first porcelain tooth material was introduced by______________?
A. DeChemant
B. Ash
C. Plateau
D. McClean
Denture acrylics contain cross-linking agents mainly to improve their_____________?
A. Internal color
B. Tissue compability
C. Surface hardness
D. Craze resistance
Casting flux is used to_______________?
A. Prevent the oxidation of the metal during melting
B. increase the melting point of the flux
C. Flaring the point of the sprue attachment
D. None of the above
Which of the following phases of dental amalgam has minimum strength____________?
A. Gamma 1
B. Gamma 2
C. Epsilon 1
D. Gamma 3
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