9 Questions
What is the purpose of leaving air spaces or vents in the investment?
To permit escape of the air from the mold
What is the purpose of spruing the wax pattern?
To create a channel for the elimination of wax during burnout
What is the advantage of using a hollow sprue over a solid one?
It is stronger in its attachment to the wax pattern
What is the purpose of the casting ring?
To hold the investment in place during setting and restrict mold expansion
What is the purpose of the vacuum technique in investing?
To reduce air bubbles and porosity in the investment
What is the purpose of applying the casting ring over the crucible former?
To hold the investment in place during setting
What is the advantage of using a split rubber ring over a metallic ring?
It is more flexible and can be reused
What is the first step in the brush technique of investing?
The accurate water-powder ratio is mixed under vacuum
What is the purpose of inverting the bowl during the vacuum technique?
To fill the ring under vacuum and vibration
This quiz covers the uses and composition of gypsum-bonded investment in dentistry, including its refractory properties and thermal expansion regulation. Learn about the role of calcium sulfate hemihydrate and crystalline polymorphs of silica in this important dental material.
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