Chapter 14: Dental Cement

Chapter 14: Dental Cement

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. In most cases, cements have ______ strength and ______ solubility when compared with other restorative materials.

ANS:  C

In most cases, cements have inferior strength and high solubility when compared with other restorative materials. With the exception of resin and glass ionomer cements, they have little or no adhesive properties. There is no one universally acceptable cement that fulfills all applications; rather, a variety of cements are available whose properties and manipulation lead them to be an appropriate choice for a given application.

REF:   p. 221             TOP:   INTRODUCTION

2. Which of the following cements is used as a direct pulp-capping agent when very small exposures of the pulp are suspected?

ANS:  C

Calcium hydroxide is used as a direct pulp-capping agent when very small exposures of the pulp are suspected. Calcium hydroxide has an alkaline pH between 9 and 11. This alkali stimulates secondary dentin when in direct contact with the pulp, providing a barrier between pulp and restoration.

REF:   p. 221             TOP:   Uses of Dental Cements (Low-Strength Base/Liner)

3. Why are high-strength bases placed in a thickness of 0.75 mm or greater?

ANS:  D

High-strength bases placed in a thickness of 0.75 mm or greater provide protection from the thermal conduction of metal restorations. Cements used as bases are mixed to secondary consistency—a thick putty-like consistency that is condensable and can be rolled into a ball or rope. When the cavity preparation is so deep that there is 2 mm or less of remaining dentin over the pulp, many clinicians will choose to provide mechanical support for the restoration by first placing a cement base.

REF:   p. 222             TOP:   Uses of Dental Cements (High-Strength Base/Liner)

4. By placing a ______ provisional restoration, the dentist is able to evaluate the response of the pulp before the reappointment for a permanent restoration.

ANS:  D

By placing a sedative provisional restoration, the dentist is able to evaluate the response of the pulp before reappointment for a permanent restoration.

REF:   p. 223

TOP:   Uses of Dental Cements (Permanent, Intermediate, and Temporary/Provisional)

5. Which of the following cements is highest in mechanical strength?

ANS:  A

Resin cement is high in mechanical strength and fracture toughness; zinc polycarboxylate cement is low in both. Glass ionomer cement and hybrid ionomer cement have moderate mechanical strength. Cements used for permanent luting and high-strength bases need good compressive and tensile strengths.

REF:    p. 225  TOP:    Properties of Dental Cements (Strength)