Dental Cement and Temporary Filling Materials
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Questions and Answers

What is the name of the cement that uses an aqueous solution of phosphoric acid buffered by zinc oxide and aluminum oxide as its liquid component?

  • Ortho-ethoxybenzoic acid (EBA) cement
  • Zinc phosphate cement (correct)
  • Zinc polycarboxylate cement
  • Glass ionomer cement

    • What is the reason why a subliner should be used in deep cavities when using zinc phosphate cement?

  • To improve the flow of the cement
  • To reduce the acidity of the cement (correct)
  • To increase the compressive strength of the cement
  • To enhance the thermal insulation properties of the cement

    • What is the minimum compressive strength required for a luting agent in zinc phosphate cement?

  • 70 MPa
  • 80 MPa (correct)
  • 90 MPa
  • 60 MPa

    • What is the primary reactive component in the powder of zinc phosphate cement?

    <p>Zinc oxide</p> Signup and view all the answers

    Why should zinc phosphate cement not be used under porcelain teeth?

    <p>It is opaque due to high amount of unreacted zinc oxide</p> Signup and view all the answers

    What is the recommended P:L ratio for cavity lining with zinc phosphate cement?

    <p>3.5:1</p> Signup and view all the answers

    What is the primary reason why reinforced material can be used under amalgam?

    <p>It has a higher compressive strength</p> Signup and view all the answers

    Why is free eugenol not used as a lining with resin-based filling materials?

    <p>It interferes with the setting time and causes discoloration</p> Signup and view all the answers

    What is a key advantage of calcium hydroxide as a pulp capping material?

    <p>It can initiate the formation of secondary dentine</p> Signup and view all the answers

    What is a limitation of calcium hydroxide as a restorative material?

    <p>It has a low compressive strength</p> Signup and view all the answers

    What is a characteristic of polycarboxylate cement?

    <p>It is composed of zinc oxides and aluminum oxide in powder form</p> Signup and view all the answers

    Why is calcium hydroxide not used as a luting agent?

    <p>It has a high solubility</p> Signup and view all the answers

    What is the compressive strength range of cement material for this type of filling?

    <p>60-220 MPa</p> Signup and view all the answers

    How does the filling material initially adhere to tooth substance?

    <p>Through the bonding of the free carboxyl group to the hydroxyapetite of enamel and dentine</p> Signup and view all the answers

    What is a characteristic of the filling material that makes it suitable for temporary fillings?

    <p>Reasonable setting time and has flow after setting</p> Signup and view all the answers

    What is the main requirement of temporary filling materials in terms of removal?

    <p>Should be easily removed from the cavity</p> Signup and view all the answers

    What is the primary indication for using this type of filling material in pedodontic treatment?

    <p>For general tooth restoration</p> Signup and view all the answers

    What is the type of ZOE that is used as a cavity liner (base)?

    <p>Type 4</p> Signup and view all the answers

    What is the ultimate compressive strength of glass ionomer cement?

    <p>80MPa</p> Signup and view all the answers

    Why is polyacrylic acid not used in deep cavities without a subliner?

    <p>It has a large molecule and lacks mobility to penetrate dentinal tubules</p> Signup and view all the answers

    What is the ratio of powder to liquid in glass ionomer cement?

    <p>1.3:1</p> Signup and view all the answers

    What is the working time of glass ionomer cement after mixing?

    <p>2 minutes</p> Signup and view all the answers

    What is the composition of the liquid component of glass ionomer cement?

    <p>47% solution of 2:1 polymeric acid and taconic acid in water</p> Signup and view all the answers

    What is the correct way to mix glass ionomer cement?

    <p>Mixing on paper pad with a stiff spatula</p> Signup and view all the answers

    What is the primary purpose of dental cements in dentistry?

    <p>To act as a barrier against thermal, electrical, and chemical stimuli</p> Signup and view all the answers

    What is a requirement for ideal cement materials?

    <p>Compatibility with the filling material</p> Signup and view all the answers

    What is a special application of dental cements?

    <p>Root canal sealer</p> Signup and view all the answers

    What is a type of cement based on phosphoric acid?

    <p>Zinc phosphate cement</p> Signup and view all the answers

    What is the purpose of luting cements?

    <p>To cement crown and bridge restorations</p> Signup and view all the answers

    What is a property of ideal cement materials?

    <p>Not irritating to the pulp</p> Signup and view all the answers

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