6 Questions
What is the chemical name of gypsum?
Calcium sulphate dihydrate
What is the main use of gypsum products in dentistry?
For casts or models, dies and investments
What is a replica of a single tooth called?
Die
What is used to record the morphology of hard and soft tissues?
Impression
What type of materials are used to prepare models and dies?
Materials that are initially fluid and can be poured
What is a replica of several teeth and their associated soft tissues called?
Model
Study Notes
Gypsum Products
- Gypsum is a naturally occurring, white powdery mineral with the chemical name calcium sulphate dihydrate (CaSO4·2H2O).
- Gypsum products used in dentistry are based on calcium sulphate hemihydrate (CaSO4)2·H2O.
Uses of Gypsum Products
- Main uses are for casts or models, dies and investments.
- Dental restorations and appliances are constructed outside the patient's mouth using models and dies.
- Models and dies are accurate replicas of the patient's hard and soft tissues.
Models and Dies
- The term model refers to a replica of several teeth and their associated soft tissues or an edentulous arch.
- The term die refers to a replica of a single tooth.
- The morphology of the hard and soft tissues is recorded in an impression.
- Models and dies are prepared using materials that are initially fluid and can be poured into the impression, then harden to form a rigid replica.
History of Model and Die Materials
- Many materials have been used for producing models and dies.
- Gypsum products are currently the most widely used material for producing models and dies.
Learn about gypsum, a naturally occurring mineral used in dentistry for creating casts, models, and dies. Understand its chemical composition and importance in dental restorations and appliances.
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