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.Management Sciences
Category: Dental Materials
What fraction of inhaled mercury vapors retained in the body ?
A. 45-55%
B. 55-65%
C. 65-85%
D. More than 85%
The main ingredient of inlay wax is__________________?
A. Candellila wax
B. Paraffin wax
C. Carnauba wax
D. Gum dammar
Setting time of ZOE is best controlled by______________?
A. Adding a drop of eugenol
B. Adding a drop of water
C. Cooling the glass slab
D. Altering ratio of two pastes
Function of carnauba wax_________________?
A. To provide a smooth and glossy surface
B. Increase toughness
C. Decrease toughness
D. Decrease flow at room temperature
Which is not present in porcelain________________?
A. Silica
B. Feldspar
C. Calcium carbonate
D. Amorphous material
For photo-curing the composite resin the light source______________?
A. Should be held at a millimeter distance from the restoration
B. Need no protection while in use
C. Will cure composite upto a depth of 5 millimeter thickness
D. Is fiber optic
Compared with dental alloys, CERAMICS show____________________?
A. High ductility
B. High hardness
C. Low esthetic value
D. Susceptibility to brittle fracture
In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
A. Improve bonding
B. Decrease porosity
C. They react with the porcelain opaque layer, which masks the metal
D. Improves the thermal expansion between the metal and porcelain
Hysteresis in a hydrocolloid gel is______________?
A. Moisture absorption
B. Temperature lag between gelation and liquefaction temperature
C. Phenomenon of conversion of gel into sol
D. All of the above
Impression compound is characterized by all of the following except_______________?
A. Warps at room temperature
B. Is a thermoset material
C. Shows increased flow when kneaded with water
D. Low coefficient of thermal conductivity
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