Softening heat treatment of alloy increases_________________?
A. Tensile strength
B. Proportional limit
C. Ductility
D. Hardness
Dental Materials
The function of a sprue is to_______________?
The function of a sprue is to_______________?
A. Form an opening of molten metal to enter the mold
B. Help polish cast restorations
C. Eliminate air bubbles on the wax pattern
D. Reproduce fine detail
Stabilization of stainless steel is achieved by adding____________?
Stabilization of stainless steel is achieved by adding____________?
A. Carbon
B. Chromium
C. Nickel
D. Titanium
The yield strength of AUstenite (NiTi alloy) is______________?
The yield strength of AUstenite (NiTi alloy) is______________?
A. 100 Mpa
B. 240 Mpa
C. 560 Mpa
D. 700 Mpa
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
A. Dimensional change
B. Thermal conductivity
C. Warpage
D. Tarnish and corrosion
Tublulence of molten gold is due to _____________?
Tublulence of molten gold is due to _____________?
A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
A. High gold
B. Low gold
C. Palladium – Ag
D. Ni – Cr
Indium in metal alloys_______________?
Indium in metal alloys_______________?
A. Improve bonding
B. Harden the metal ceramic Ag-Pd alloy
C. Both A and B
D. None of the above
Mouth temperature waxes are_______________?
Mouth temperature waxes are_______________?
A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above
Incomplete casting is the result of_____________?
Incomplete casting is the result of_____________?
A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue
D. Large reservoir