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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?
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?
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?
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?
What is the main reason why zinc polycarboxylate cement is less irritant to the pulp than zinc phosphate cement?
Why is zinc polycarboxylate cement not used for permanent cementation of translucent restorations?
Why is zinc polycarboxylate cement not used for permanent cementation of translucent restorations?
What is the significance of a shiny mix when preparing zinc polycarboxylate cement?
What is the significance of a shiny mix when preparing zinc polycarboxylate cement?
Which of the following is NOT a characteristic of zinc polycarboxylate cement?
Which of the following is NOT a characteristic of zinc polycarboxylate cement?
Why is polyacrylic acid less irritant to the pulp than phosphoric acid?
Why is polyacrylic acid less irritant to the pulp than phosphoric acid?
Why should the correct mix of zinc polycarboxylate cement be shiny?
Why should the correct mix of zinc polycarboxylate cement be shiny?
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