Chapter 17 Question and answers already passed 2024/2025
5 views 0 purchase
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Carzola98. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
