Impression Materials Lecture

These flashcards cover the key concepts and objectives related to impression materials in dentistry, aiding in review for the exam.

What are the uses of impression materials in dentistry?

Impression materials are used to make replicas of teeth and other oral tissues for fabricating restorations or other appliances.

What is the difference between a model, cast, and die?

A model is a study model used for diagnosis and treatment planning; a cast is used for the construction of restorations or appliances; a die is a replica of a single tooth.

What are the two main types of impression materials?

Elastic and inelastic impression materials.

What is the significance of impression trays?

Impression trays serve as carriers for impression materials and come in various sizes and shapes.

What is bite registration in dentistry?

Bite registration records the occlusal relationship between dental arches.

What is the composition and setting mechanism of alginate?

Alginate is an aqueous elastomeric material that sets via a chemical reaction.

What is the effect of water temperature on the setting rate of alginate?

Water temperature controls the set time of alginate.

What are the desirable qualities of an impression material?

Desirable qualities include accuracy, detail reproduction, and appropriate setting time.

What is the main component of aqueous elastomeric impression materials?

The main component is water.

What is syneresis in relation to hydrocolloid materials?

Syneresis is when hydrocolloid materials contract slightly after setting and extrude water.

What is imbibition?

Imbibition occurs when the hydrocolloid absorbs water, swells, and distorts.

What are the classification criteria for impression materials?

They can be classified based on chemical reactions (thermosets and thermoplastics) and their elasticity (elastic vs. inelastic).

What are the key properties of irreversible hydrocolloids?

Irreversible hydrocolloids, such as alginate, set via a chemical reaction and do not return to the sol state.

What materials are categorized under inelastic impression materials?

Inelastic materials include plaster, wax, and zinc oxide-eugenol (ZOE).