MCQs in Endodontics

Chapter 19: Root resorption


1- Internal resorption:

  1. radiographically is often confused with external replacement resorption:
  2. is associated with systemic disease.
  3. is usually associated with trauma.
  4. usually results only if odontoblasts and/or predentin layer is lost or altered.






The answer is: A


 2- Studies of internal resorption have shown:

  1. histologic differences in the process in primary and permanent teeth.
  2. no difference in rate of progression of the process in primary and permanent teeth.
  3. normal pulp is replaced by a periodontal-like connective tissue.
  4. resorption of dentin and no deposition of mineralized tissue.







The answer is: A


 3- External resorption may be found in which one of the following systemic diseases:

  1. Hypoparathyroidism.
  2. Diahetes.
  3. Leukemia.
  4. Parkinson's disease.






 The answer is: C


4- Apical external resorption, as related to periapical pathosis:

  1. requires surgical intervention (apicoeetomy).
  2. is usually associated with a necrotic pulp.
  3. is initially treated with conventional root canal treatment, although this has a questionable outcome.
  4. is usually irreversible, has a poor prognosis, and requires extraction.






The answer is: B


 5- Resorption following bleaching:

  1. is a reason not to treat tctracycline-stained teeth with root canal therapy and internal bleaching.
  2. may be due to erosion of dentin exposed at the cervical line.
  3. is related to the use of heat and 309; hydrogen peroxide.
  4. docs not occur unless there is a history of trauma.







The answer is: C


 6- Orthodontic treatment resorption is most prevalent in:

  1. maxiilary incisors.
  2. mandibular incisors.
  3. maxillary premolars,
  4. mandibular premolars.







The answer is: A


7- Avulsed teeth replanted without pulpectomy usually exhibit:

  1. revascularization of pulp space.
  2. surface resorption.
  3. inflammatory resorption.
  4. ankylosis.







The answer is: C


 8- Cementum is more resistant than bone to resorption. A theory as to why this is true is that:

  1. cementum is more mineralized than bone.
  2. cementum contains an antiresorptivc factor.
  3. bone is vascular; cementum avascular.
  4. liber patterns in cementum are different than in bone and tend to be more resistant to ciast-typc cells.







The answer is: B


 9- The two major local causes of root resorption are:

  1. inflammation and excessive pressure.
  2. inflammation and cementoclast-activating factor.
  3. excessive pressure and increased pH of ground substance.
  4. cementoclast-activating factor and increased pH of ground substance.







The answer is: A


 10- As related to root resorption during orthodontic movement root canal-treated teeth are:

  1. more resistant to resorption.
  2. less resistant to resorption.
  3. no different than untreated teeth.
  4. more prone to resorption if there is a history of apical root resorption as related to apical pathosis.







The answer is: C


 11- Lateral inflammatory root resorption is usually:

  1. related to a tooth injury that damages the PDL.
  2. related to sterile pulp necrosis.
  3. irreversible.
  4. successfully treated only if calcium hydroxide is placed in the canal prior to obturation.







The answer is: A


 12- Clinical features of early stages of lateral inflammation root resorption include that usually it is:

  1. associated with normal pulp testing, visible radiographically.
  2. asymptomatic, not visible radiographically.
  3. associated with no (or abnormal) response to pulp testing, symptomatic,
  4. symptomatic, not visible radiographically.







The answer is: B


 13- Cervical root resorption is in many (or most) cases:

  1. of unknown etiology.
  2. related to a subluxation injury.
  3. associated with a necrotic, infected pulp.
  4. unrelated to inflammation in the cervical periodontium.






The answer is: C


14- Treatment of medium depth cervical root resorption usually requires:

  1. root canal treatment alone.
  2. root canal treatment followed by surgery.
  3. surgery alone.
  4. surgery, followed if necessary by root canal treatment.






The answer is: D


 15- These clinical features of internal resorption usually include:

  1. positive response to pulp testing, visible in the pulp spacersdiographically.
  2. visible in both the pulp space and as a defect in the adjacent bone.
  3. symptomatic, visible radiographically in the pulp space.
  4. asymptomatic, visible radiographically in (he pulp space, variable response to pulp testing.







The answer is: D


 16- In the treatment of nonpcrlorating internal resorption, calciumhydroxide may be used in the canal primarily to:

  1. sterilize the canal space.
  2. remineralize the resolved areas.
  3. aid in breaking down inaccessible areas containing tissue.
  4. lower pH in the tissue to counteract the dentinobiasts.







The answer is: C


 17- A common histologic feature of replacement resorption is :

  1. areas of fusion of bone with cemenlum/dcntin.
  2. inflammation in the adjacent periodontium.
  3. pulp necrosis with bacteria deep into the tubules.
  4. areas of necrotic bone and necrotic cementum.







The answer is: A


 18- A treatment approach that will generally arrest replacement resorption is:

  1. pulpectomy and placement of Ca(OH)2.
  2. surgery to expose and curette the defect.
  3. pulpectomy and immediate obturation.
  4. nonexistent. There is no known effective treatment.






Answer is : D


19- The cells responsible for root resorption are:


  1. Fibroblasts
  2. Cementoblasts
  3. Oesteoblasts
  4. Osteoclasts
  5. Odontoblast






The answer is: D