MCQs in Endodontics

Chapter 16: Dental Trauma



1- If several teeth are out of alignment following trauma, the most reasonable explanation is:

  1. luxation.
  2. subluxation.
  3. alveolar fracture.
  4. contusion.






The answer is: C


2- Initial vitality testing of traumatized teeth is most useful to:

  1. establish a baseline for comparison with future testing.
  2. determine whether or not root canal treatment is indicated.
  3. determine if the blood supply to the pulp is compromised.
  4. predict the prognosis.






The answer is: A


3- Initial radiographic examination of dental injuries that include lip lacerations:

  1. reveals hairline root fractures.
  2. reveals facial-lingual diagonal root fractures.
  3. may reveal foreign objects in the lips.
  4. should include occlusal views.







The answer is: C


 4- Rubber dam application for the placement of a restoration at the emergency appointment:

  1. usually is not advisable.
  2. is absolutely essential.
  3. usually is possible.
  4. is dictated by the restorative material.







The answer is: C


5- Which of the following radiographic film exposures is best for diagnosing root fractures in the apical third:

  1. Parallel.
  2. Bisecting angle.
  3. Occlusal.
  4. Panoramic.







The answer is: C


6- The initial priority in treatment of a horizontal root fracture with significant mobility is:

  1. preservation of the pulp.
  2. reduction and immobilization.
  3. root canal therapy.
  4. calcium hydroxide pulp therapy.







The answer is: B


7- To prevent the onset of inflammatory resorption, the mature intruded tooth must:

  1. be allowed to reerupt.
  2. have the pulp removed within 1 to 2 weeks.
  3. have the pulp removed after the tooth is in position.
  4. have an immediate root canal filling completed.







The answer is: B


8- Inflammatory resorption is the mechanism of:

  1. rejection of autogenous protein.
  2. eliminating infected calcified tissue.
  3. scar tissue formation.
  4. sequestration of bone.








The answer is: B


9- Comparing dental trauma in boys and girls:

  1. The rate of trauma is increasing more rapidly in girls.
  2. Girls have more injuries as the result of fisttights.
  3. Boys have more injuries in the maxilla, girls in the mandible.
  4. Injuries are common in boys, rare in girls.







The answer is: A


10- A direct facial "padded" blow to the incisors is more likely to cause:

  1. enamel fracture.
  2. enamel-dcntin fracture.
  3. dentin fracture-pulp exposure,
  4. luxation.







The answer is: D


11- Apulpotomy (coronal pulp removal) is indicated when there is a crown fracture and pulp exposure and:

  1. root formation is incomplete and the crown is fractured in the cervical one-third.
  2. the pulp has been exposed longer than I week.
  3. the puip is hypersensitive to cold.
  4. any portion of the fracture extends to the root.







The answer is: A


12- Nonunion of a root fracture and inflammatory response from pulp necrosis is indicated radiographically by:

  1. a periapical lesion.
  2. marked separation of the segments.
  3. root resorption adjacent to the fracture.
  4. widening of the fracture and resorption of adjacent bone.







The answer is: D


13- Displaced teeth that had pulp necrosis with root resorption and then had the appropriate endodontic treatment:

  1. often had continued resorption.
  2. occasionally had ankylosis.
  3. had a high rate of success,
  4. usually developed apical pathosis.







The answer is: C


14- Which medium of storage for an avulscd tooth is best for prolonecd periods:

  1. Milk.
  2. Distilled water.
  3. Hank's balanced salt solution.
  4. Patient's saliva.







The answer is: C


15- After replantation of an avulscd tooth that has air dried, comparing RCT with immediate gutta-percha obturation vs. treatment with intracanal calcium hydroxide, the research:

  1. shows that both arc doomed to failure.
  2. shows that RCT/immediate GP has the best success.
  3. shows that calcium hydroxide treatment first has the best success.
  4. as yet is inconclusive.







The answer is: D


16- A primary tooth whose crown is displaced lingually and the root facially:

  1. is likely to damage the permanent successor.
  2. should be extracted.
  3. often will ankylose, with resulting displacement of the erupting successor.
  4. generally requires no treatment and causes no damage to the successor.







The answer is: D


 17- If a fully formed tooth has suffered an intrusive injury and the crown is partially exposed, what is the recommended treatment:

  1. Leave alone and allow to erupt spontaneously.
  2. Splint for 7 to 10 days; watchful waiting.
  3. Orthodontially reposition into correct alignment within 3 to 4 weeks.
  4. Reposition with forceps.







The answer is: C


I8- If calcific metamorphosis (reduction in canal space) is observed radiographically following a displacement, the treatment is:

  1. immediate root canal treatment.
  2. root canal treatment only if the tooth is unresponsive to pulp tests.
  3. root canal treatment only if the tooth discolors.
  4. nothing unless signs and symptoms of periapical pathosis develop in the future.







The answer is: D


19- Alvused replanted teeth with incomplete root formation:

  1. require pulp removal if the extraoral period is more than 2 hours.
  2. are prone to internal resorption.
  3. are tested for revascularization with the electric pulp tester.
  4. in most cases develop roots.







The answer is: A


20- Which is most likciy to result in severe pulp damage (necrosis):

  1. Intrusion displacement.
  2. Lateral displacement,
  3. Enamel-dentin fracture.
  4. Cervical one-third root fracture.







The answer is: A


21- In a tooth that has been injured, a dramatic or distinct color change to purple or dark gray after a few weeks is usually indicative of:

  1. internal hemorrhage that is reversible.
  2. internal resorption that is irreversible.
  3. internal resorption that is reversible.
  4. pulp necrosis.







The answer is: D


22- A nonmobilc. asymptomatic root fracture with evidence of hyper calcification of the pulpal space of the coronal generally requires:

  1. no further treatment,
  2. root canal therapy with gutta-percha.
  3. root canal therapy with calcium hydroxide initially.
  4. extraction because there is likely to be pathosis.







The answer is: A


23- The best way to treat a mature root fractured in the middle one third with mobility and no response to pulp testing is:

  1. to reposition segments, splint, and monitor.
  2. to splint, begin access, pack with Ca(OH)-.
  3. to extract immediately, because restoration is impossible.
  4. to perform root canal therapy, anchor segments together with cast post, and restore.







Answer is : A


24- A Traumatized tooth with necrotic pulp shows periapical area of rarefaction radiographically. The pulpal area is closed. Viable microorganisms might be cultured from the canal in approximately what percentage of cases:


  1. 10%
  2. 30%
  3. 40%
  4. 80%







The answer is: D (Enterococci are found mostly)