MCQs in Endodontics

Chapter 13: Pulpal Reactions

 

 1- The most common dentin response in the zone deep to caries is:

  1. increased permeability.
  2. alteration of collagen.
  3. dissolution of peritubular dentin.
  4. dentin sclerosis.

 

 

 

 

 

The answer is: D

 

 2- Although each carious lesion is individual and influenced by multiple factors, the caries process is generally:

  1. continuous.
  2. rapid.
  3. intermittent.
  4. slow.

 

 

 

 

 

The answer is: C

 

3- Relatively few bacteria are found in a pulp abscess because of the:

  1. immune response of pulp tissue.
  2. high tissue pH in the adjacent inflammation.
  3. mechanical blockage of sclerotic dentin.
  4. antibacterial products of neutrophils.

 

 

 

 

 

 The answer is: D

 

4- Hyperplastic pulpitis:

  1. occurs only in permanent molars.
  2. occurs when there is no damage.
  3. is not invaded by bacteria.
  4. is predominantly acute inflammation.

 

 

 

 

 

The answer is: C

 

5- A periodontal ligament injection of 2% lidocaine with 1:100,000 epinephrine will cause the pulp circulation to:

  1. cease for about 30 minutes.
  2. remain the same.
  3. increase markedly.
  4. decrease slightly.

 

 

 

 

 

The answer is: A

 

6- Of the following, the highest incidence of pulp necrosis is associated with:

  1. class V preparations on root surface.
  2. inlay preparations.
  3. partial veneer restorations.
  4. full crown preparations.

 

 

 

 

 

The answer is: D

 

7- According to the hydrodynamic theory of dentin sensitivity, the movement of fluid through dentinal tubules:

  1. stimulates the sensory nerve fibers of the underlying pulp.
  2. displaces odontoblasts into the pulp tissue.
  3. has minimal effect on the odontoblasts.
  4. results in the death of many odontoblasts.

 

 

 

 

 

The answer is: C

 

8- Acid etching of dentin before insertion of the restorative material:

  1. protects the pulp from bacterial invasion.
  2. enhances bacterial penetration of the dentin.
  3. destroys odontoblastic processes in the tubules.
  4. decreases the pulp response to the restorative material.

 

 

 

 

 

The answer is: B

 

9- Pulpal blood flow is most increased by:

  1. impression taking using modeling compound with copper banding.
  2. fabrication of acrylic temporary restoration.
  3. rubber base impression.
  4. hydrocolloid impression.

 

 

 

 

 

 

The answer is: A

 

10- Dental tubules should be sealed before placement of restorations to:

  1. allow a calcium bridge to form in the pulp.
  2. reduce the pathogenicity of the microorganisms.
  3. decrease the number of dentinal tubules.
  4. decrease the permeability of underlying dentin.

 

 

 

 

 

The answer is: D

 

11- The smear layer on dentin walls acts to prevent pulpal injury by:

  1. reducing diffusion of toxic substance through the tubules.
  2. resisting the effects of acid etching of the dentin.
  3. eliminating the need for a cavity liner or base.
  4. its bactericidal activity against oral microorganisms.

 

 

 

 

 

The answer is: A

 

12- A common histologic change in the pulp in response to moderately deep dentin caries is:

  1. chronic inflammation.
  2. acute inflammation.
  3. vasoconstriction.
  4. increased numbers of odontoblasts.

 

 

 

 

 

The answer is: A

 

13- Application of frictional heat to exposed dentin may result in:

  1. severe postoperative symptoms.
  2. vascular stasis or intrapulpal hemorrhage.
  3. proliferation of cells in the cell-rich zone.
  4. invariably chronic Inflammation.

 

 

 

 

 

The answer is: B

 

14- Hypersensitivity is best relieved or controlled by:

  1. opening tubules to permit release of intrapulpal pressure.
  2. root planing to remove surface layers that arc hypersensitive.
  3. applying antiinflammatory agents to exposed dentin.
  4. blocking exposed tubules on the dentin surface.

 

 

 

 

 

The answer is: D

 

15- Deeper cavity preparations have more potential for pulp damage because:

  1. tubule diameter and density increase; therefore, there is increasing permeability.
  2. there is more vibration to pulp cells.
  3. odontoblastic processes are more likely to be severed.

 

  1. 1 only.
  2. 3 only.
  3. 1 and 3.
  4. 2 and 3.

 

 

 

 

The answer is: C

 

 16- The pulp generally begins to show histologic changes of inflammation as soon as caries has entered:

  1. the dentin.
  2. the enamel.
  3. the pulp.
  4. the reparative (irregular secondary) dentin.

 

 

 

 

 

The answer is: A

 

17- Of the following, which is the best way to prevent pulp damage during cavity preparation:

  1. Retain the smear layer.
  2. Use diamond burs with a brush stroke.
  3. Use adequate air coolant.
  4. Use adequate water coolant.

 

 

 

 

 

The answer is: D

 

18- Which is the major reason why class 11 restorations with composite is damaging to the pulp:

  1. Microleakage at the occlusal.
  2. Microleakage at the gingival margin.
  3. Toxic chemicals are released from the composite and diffuse into the pulp.
  4. Polymerization shrinkage distorts the material at the occlusal and opens gaps which results in recurrent caries.

 

 

 

 

 

The answer is: B

 

19- A pulp has been damaged and is inflamed because of deep caries and cavity preparation. What material placed on the floor of the cavity aids the pulp in resolving the inflammation?

  1. Ca(OH)2
  2. ZnOE base.
  3. Steroid formulations.
  4. There is no medication or material that actively promotes pulp healing.

 

 

 

 

 

The answer is: D

 

20- A cusp fractures and exposes dentin but not the pulp. What is the probable response in the pulp?

  1. Severe damage with irreversible inflammation.
  2. Mi Id-to-moderate inflammation.
  3. Pain but no inflammation.
  4. No pulp response.

 

 

 

 

 

 

The answer is: B