Dental Materials Quiz - Gypsum and Models

A 3D representation of a patient's teeth and surrounding tissues, created from an alginate impression and poured with gypsum.

A material used to create dental models, composed of calcium sulfate dihydrate.

A mixture of gypsum powder with water that hardens to form a dental model.

The process where gypsum crystals dissolve in water and then interlock to form a solid structure.

A tool used to shape and trim gypsum models, ensuring a smooth and accurate final product.

A type of gypsum-based material used in dentistry for making casts and models; known for its greater uniformity, less porosity, and increased strength compared to model plaster.

A high-strength gypsum material used for creating dies for crowns, bridges, and indirect restorations; offers improved hardness, dimensional accuracy and strength.

The strongest dental stone, minimizing expansion and ensuring ideal casting properties for newer alloys; not recommended for creating inlays or onlays.

The ratio of gypsum powder to water used to create a dental cast, significantly influencing the setting time and strength of the final product.

A problem that results from using too little water, resulting in a faster setting time, a stiff, difficult-to-handle mix and potentially a weaker product.

Gypsum is a naturally occurring mineral used in dentistry to create casts of teeth. It's a calcium sulfate compound found in the earth.

During the production process, gypsum is heated to remove water, transforming it from a dihydrate form (2 parts water) into a hemihydrate form (1.5 parts water) This hemihydrate form is a powder used to make dental models.

When gypsum powder is mixed with water, the hemihydrate crystals dissolve and create clusters called 'nuclei.' These nuclei interlock as the gypsum sets, creating a strong and rigid structure.

The ratio of powder to water is crucial for gypsum. Too much water makes the mixture weak and prone to cracking. Too little water shortens the working time and can lead to air bubbles.

Different types of gypsum are classified based on their strength and setting time. Model plaster is the weakest, dental stone is stronger and die stone is the strongest.

The weakest type of gypsum product, used for preliminary impressions and diagnostic models.

Similar to Type I but slightly stronger, primarily used for creating study models and casts.

The strongest gypsum product, ideal for creating dies for wax patterns used in creating crowns, bridges, and indirect restorations.

A replica of a patient's teeth and surrounding tissues, used for planning treatment or creating prosthetics.

The part of the dental model that includes the teeth and gum tissue.

The base of the dental model, providing support and a stable platform.

A technique where the base of the model is created with a separate pour of gypsum material after the anatomic portion is set.

A method where the base is formed by pouring gypsum material into a wax impression, creating the complete model in one step.