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.Management Sciences
Category: Dental Materials
Which of the following is function of fluoride flux in soldering process ?
A. It prevents the formation of copper oxide
B. It prevents the formation of chromium oxide or dissolves chromic oxide layer
C. It prevents the flow of material in undesirable area
D. Increase the strength of solder
Which of the following refractory is used to counteract most of the expansion________________?
A. Quartz
B. Cristobalite
C. Tridymite
D. Corundum
Inadequate pressure application during flasking_______________?
A. Increases vertical dimension
B. Causes teeth to be shrunken in investment
C. Causes poor quality of colour
D. Causes fracture of denture
Acrylic resins were first introduced as a denture base material in______________?
A. 1925
B. 1937
C. 1951
D. 1956
Compare to conventional amalgams, spherical amalgams_______________?
A. Require more mercury
B. Require heavy compection forces
C. Have longer setting times
D. None of the above
Which one of the following is used as filler in composite resins ?
A. Quartz
B. Silicates
C. Zinc particles
D. Aluminium
Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?
A. Crystalline
B. Granular gold
C. Mat gold
D. Sponge gold
The solid solution of silver and mercury is called_______________?
A. y1
B. y2
C. B1
D. y
The setting expansion of gypsum products can be reduced by________________?
A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water
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