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Dental Material Quiz
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Dental Material Quiz

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Questions and Answers

What is the main reason why zinc polycarboxylate cement is less irritant to the pulp than zinc phosphate cement?

  • Polyacrylic acid is a weaker acid than phosphoric acid. (correct)
  • Zinc polycarboxylate cement contains less zinc oxide particles.
  • Polyacrylic acid can penetrate the dentinal tubules.
  • Zinc polycarboxylate cement reaches neutral more rapidly.

    • Why is zinc polycarboxylate cement not used for permanent cementation of translucent restorations?

  • Because it cannot make a chemical bond to the tooth structure.
  • Because it has a low viscosity.
  • Because the unreacted zinc oxide particles are opaque. (correct)
  • Because it cannot penetrate the dentinal tubules.

    • What is the significance of having a shiny mix when using zinc polycarboxylate cement?

  • The shiny mix is less viscous, making it easier to manipulate.
  • The shiny mix contains less zinc oxide particles, making it less irritant to the pulp.
  • The shiny mix contains unreacted (free) polyacrylic acid, which is needed to make a chemical bond to the tooth structure. (correct)
  • The shiny mix can penetrate the dentinal tubules more effectively.

    • What is the main reason why zinc polycarboxylate cement is less irritant to the pulp than zinc phosphate cement?

    <p>Zinc polycarboxylate cement has a weaker acid than phosphoric acid</p> Signup and view all the answers

    Why is zinc polycarboxylate cement not used for permanent cementation of translucent restorations?

    <p>The unreacted zinc oxide particles are opaque</p> Signup and view all the answers

    What is the significance of a shiny mix when preparing zinc polycarboxylate cement?

    <p>It contains unreacted (free) polyacrylic acid, which is needed to make a chemical bond to the tooth structure</p> Signup and view all the answers

    Which of the following is NOT a characteristic of zinc polycarboxylate cement?

    <p>It can penetrate the dentinal tubules</p> Signup and view all the answers

    Why is polyacrylic acid less irritant to the pulp than phosphoric acid?

    <p>It is a weaker acid</p> Signup and view all the answers

    Why should the correct mix of zinc polycarboxylate cement be shiny?

    <p>Because it contains unreacted polyacrylic acid</p> Signup and view all the answers

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