Chapter 17 Question and answers already passed 2024/2025
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Course
GYPSUM AND WAX
Institution
GYPSUM AND WAX
Chapter 17 Question and answers already passed 2024/2025 Chapter 16: Gypsum and Wax Products
Casts - correct answer models created from impression; positive reproduction of the structures
Diagnostic casts (study models) - correct answer used to plan treatment and observe the oral structu...
Chapter 16: Gypsum and Wax Products
Casts - correct answer ✔models created from impression; positive
reproduction of the structures
Diagnostic casts (study models) - correct answer ✔used to plan treatment
and observe the oral structures of the mouth
working casts (working models) - correct answer ✔used to fabricate
appliances such as orthodontic retainer or bleaching tray or removable
prosthesis such as a partial or full denture
Dies - correct answer ✔replicas of individual teeth or groups of teeth and are
used to fabricate crowns and bridges
What is wax used for? - correct answer ✔fabricate direct waxing patterns for
cast restorations, alterations and adaptations for impressions trays, wax bite
registration;
All casts and dies must be - correct answer ✔accurate, hard, and
dimensionally stable under normal conditions of use and storage
Because working casts and dies are used to fabricate intraoral prostheses
and restorations they must also have excellent reproduction of - correct
answer ✔fine detail, strength, and resistance to abrasion and minimal
solubility
Unrefined state of gypsum - correct answer ✔dihydrate form of calcium
sulfate
, When heated during manufacturing process, water is removed and gypsum is
converted into a powdered ____________. This process is known as
__________ - correct answer ✔hemihydrate; calcination
The by-product of the chemical reaction of converting hemihydrate back to
dihydrate is heat, so therefore it a _____________ reaction - correct answer
✔exothermic
The amount of water mixed with the calcium sulfate hemihydrate is greater
than the amount required for the chemical reaction, why is there excess
water? - correct answer ✔so the gypsum mix can flow into the details of
dental impressions
Model plaster - correct answer ✔mineral gypsum is heated in open vats at
115 C and the resulting hemihydrate is porous and irregular in shape
What are model plaster typically used for? - correct answer ✔diagnostic
casts
Dental stone - correct answer ✔the heating process is done under pressure
in the presence of steam at 125 c making a more uniformly shaped and less
porous hemihydrate
Dental stone is used for? - correct answer ✔working casts
Die stone - correct answer ✔gypsum rock is boiled in 30% calcium chloride
solution and densite is produced. densite is washed and heated with greater
increase in pressure and even more refining. densest stone/high strength
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