Properties of Dental Materials Quiz

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Questions and Answers

What is the main advantage of non-eugenol paste?

  • It has better dimensional stability
  • It has a faster setting time
  • It is more cost-effective
  • It is used for patients with eugenol allergy (correct)

What is the chemical reaction involved in the setting of non-eugenol paste?

  • Oxidation-reduction reaction
  • Acid-base reaction
  • Saponification (correct)
  • Chelation

What is the primary disadvantage of impression plaster?

  • It is rigid and can fracture easily (correct)
  • It has poor dimensional stability
  • It is expensive
  • It has a long setting time

What is the main reaction that occurs during the setting of impression plaster?

<p>Crystallization (C)</p> Signup and view all the answers

What is the main reason impression waxes are no longer widely used?

<p>They do not undergo any physical or chemical reaction (B)</p> Signup and view all the answers

Which of the following is a property of non-eugenol paste?

<p>It is supplied as two separate pastes (base and catalyst) (A)</p> Signup and view all the answers

What is the primary advantage of impression plaster over other impression materials?

<p>It is inexpensive and easy to use (B)</p> Signup and view all the answers

What is the main disadvantage of the exothermic reaction that occurs during the setting of impression plaster?

<p>It can cause dryness in the patient's mouth (A)</p> Signup and view all the answers

What is the primary advantage of thermoplastic impression materials over non-thermoplastic materials?

<p>They can record undercuts and fine details (D)</p> Signup and view all the answers

Which of the following statements about impression waxes is true?

<p>They do not set by any physical or chemical reaction (D)</p> Signup and view all the answers

Flashcards

Non-eugenol paste

A type of dental material used for taking impressions, designed for patients with an allergy to eugenol, a common ingredient in dental cements.

Saponification

The chemical reaction involved in the setting of non-eugenol paste, where a base and a catalyst react to form a solid.

Impression plaster

A dental material used to take impressions, known for its low cost and ease of use. However, it is prone to breaking due to its rigid nature.

Crystallization

The primary process involved in the hardening of impression plaster, where tiny crystals form and interlock, creating a solid structure.

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Impression wax

A type of dental material used for taking impressions, that does not set by any chemical reaction, but instead uses a physical process.

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Two-paste system

Non-eugenol paste is supplied as two separate pastes - a base paste and a catalyst paste. These pastes are mixed together to initiate the setting reaction.

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Inexpensive and easy to use

A key advantage of impression plaster over other impression materials is its low cost and ease of use, making it a budget-friendly option for creating dental molds.

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Exothermic reaction

During the setting process, impression plaster gives off heat, potentially causing discomfort in the patient's mouth due to dryness.

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Thermoplastic impression materials

A category of impression materials that can accurately capture undercuts and fine details of teeth. They soften with heat and harden as they cool down.

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No chemical reaction

Impression wax does not undergo any chemical or physical changes as it sets. Instead, it simply hardens when it cools down.

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