Investment Quiz
Ultimate Investment Knowledge Quiz
Test your understanding of investment materials and processes with this comprehensive quiz designed for dental professionals.
Challenge yourself and understand key concepts such as:
- Investment materials and their properties
- Casting techniques
- Thermal and hygroscopic expansion
There's several purposes of heating the investment one of them is to remove the wax by softening or burning another purpose is:
Avoid the rapid cooling of the alloy or ceramic so it can fill the place of wax significantly
We heat it just because we want the wax to be removed
Nothing of the above
The temperature of the investment should be approximately the same as the metal temperature
True
False
The requirements of investment material are/is
The investment should be capable of reproducing the shape, size and detail recorded in the wax pattern.
The investment mould should be capable of maintaining its shape and integrity at the alloy casting elevated temperatures
The investment should have a sufficiently high value of compressive strength at the casting temperature
All of the above
Is some cases we build up the porcelain directly on the die so we attend to use a die that made of
Plaster or stone
Investment
Distone
Non of the above
There are two main type of expansion that occur to the investment one of them is hygroscopic expansion
True
False
In the burnout stage the type of expansion that occur is/are
Thermal expansion
Hygroscopic expansion
Setting expansion
All of the above
Is a refractory material which adequately withstands the temperatures used during casting
Silica
Waxes
Gepsum
All of the above
To control setting time in gepsum bounded investment we attend to use
A) Silica gell
B) Powdered graphite
C) Powdered copper
D) B+C
Related to crystalline inversion
When heating the material to a degree that is less than 575 'C less dense Structure is present
A) When heating the material to a degree that is 575 'C more dense Structure is present
B) When heating the material to a degree that is more than 575 'C less dense Structure is present
C) Nothing of the above
D) B+C
The function of the gepsum in the investment mixture are
A) Aid in setting expansion
B) Work as a binder
C) Aid in Thermal expansion
D) A+B
Dental gypsum-bonded casting investments is suitable for gold alloys
True
False
Quartz or cristobalite is type of one of the following
Gepsum
Impression materials
Silica
In the case of fabricating dentures we don't have to high temperature degrees because :
A) There is no molten metal that will replace the removed wax
B) We just have to remove the wax
C) A+B
D) Non of the above
Thermal expansion is greater for the colloidal silica-mixed materials than for the water-mixed materials
True
False
The use of colloidal solution of silica instead of water for mixing with the powder has the dual effect of
Increasing setting expansion
Strengthening the set material
All of the above
Type 1 of phosphate-bonded investment is for partial dentures and other cast, removable restorations
True
False
Phosphate-bonded investments decompose above 1200ºC
False
True
On heating the investment prior to casting, mould enlargement occurs by
A) thermal expansion
B) inversion of the silica
C) setting expansion
D) A+B
The most common type of investment is
Phosphate-bonded
Gepsum-bounded
Silica-bounded
The wax burn-out temperature is the same for all type of investments
False
True
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