The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?
A. 2.3%
B. 1.56%
C. 1.37%
D. 3%
Dental Materials
Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
A. Type I – Soft
B. Type II – Hard
C. Type III – Hard
D. Type IV – Extra Hard
Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?
Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?
A. Chromium
B. Indium
C. Irridium
D. Palladium
Nickel is added to wrought gold alloys as______________?
Nickel is added to wrought gold alloys as______________?
A. Strengtherner
B. Hardener
C. Whitens the alloy
D. Scavenger
Stages of annealing in order_________________?
Stages of annealing in order_________________?
A. Recovery recrystallization grain growth
B. Recrystallization recovery, grain growth
C. Grain Growth Recrystallization recovery
D. Melting point, grain growth, Recrystallization
The term ordered hardening heat treatment used in which of the following dental alloys ?
The term ordered hardening heat treatment used in which of the following dental alloys ?
A. Gold-Copper
B. Nickel-Chromium
C. Nickel-Titanium
D. Silver-Palladium
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
A. 11.5-12.5×10-6/°C
B. 10.5-11.5×10-6/°C
C. 13.5-14.5×10-6/°C
D. 16.5-17.5×10-6/°C
Quartz is added to gypsum bonded investment to______________?
Quartz is added to gypsum bonded investment to______________?
A. Increase the strength
B. Counter balance contraction of gypsum during heating
C. aid in hygroscopic expansion
D. Increase the shelf life of investment
Annealing is also known as_______________?
Annealing is also known as_______________?
A. Soft hardening treatment
B. Hard hardening treatment
C. Precipitating heat treatment
D. Stress relieving heat treatment
The best fuel gas when used with oxygen is______________?
The best fuel gas when used with oxygen is______________?
A. Hydrogen
B. Natural gas
C. Propane
D. Acetylene