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Dental Cements Overview

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Questions and Answers

What is the composition of the powder in polymer-reinforced cement?

50% ZnO, 50% PMMA
80% PMMA, 20% ZnO
80% ZnO, 20% PMMA (correct)
100% ZnO

What is the composition of the liquid in polymer-reinforced cement?

90% eugenol oil, 10% polystyrene (correct)
90% polystyrene, 10% eugenol oil
100% polystyrene
100% eugenol oil

What is the compressive strength of EBA cement?

85 MPa (correct)
38 MPa
100 MPa
50 MPa

What is the purpose of using zinc oxide non-eugenol cements for cementation of temporary restorations on teeth that will receive final ceramic restorations?

To ensure that the tooth surface will not contain any eugenol, which would inhibit the polymerization of the resin cements during final cementation (C) Signup and view all the answers

What is the purpose of adding resin and copolymers to the powder of EBA cement?

To decrease the brittleness (B) Signup and view all the answers

Which of the following is a use of zinc oxide non-eugenol cements?

Cementation of temporary restorations on teeth that will receive final ceramic restorations (B) Signup and view all the answers

How was the setting time of rapid set ZnO/E cement reduced?

By modifying the powder particle size and shape, increasing the recommended P/L ratio, and increasing the amount of accelerators (D) Signup and view all the answers

What is the main difference between polymer-reinforced cement and EBA cement?

Polymer-reinforced cement contains ZnO and PMMA, while EBA cement contains ZnO, alumina, and resin & copolymers (B) Signup and view all the answers

Which of the following is a use of both polymer-reinforced cement and EBA cement?

All of the above (D) Signup and view all the answers

What is the purpose of adding polystyrene to the liquid component of polymer-reinforced cement?

To increase the compressive strength (A) Signup and view all the answers

What is the main difference between polymer-reinforced cement and zinc oxide non-eugenol cements?

Zinc oxide non-eugenol cements are used for patients sensitive to eugenol, while polymer-reinforced cement is not (C) Signup and view all the answers