MCQs in Endodontics

Chapter 7: Cavity preparation

 


1 - Kasahara and colleagues reported that:

 

  1. accessory canals arc capable of being cleaned mechanically al least 60% of the time.
  2. over 60% of teeth examined showed accessory canals that were impossible to clean mechanically.
  3. apical foramina were located at the apex 80% of the time.
  4. canals terminate in the shape of a delta 45% of the time.

 

 

 

 

 

 

The answer is: B

 

 

2 - Once the pulp chamber has been opened, canal orifices are located with:

  1. a periodontal curette.
  2. a spoon excavator.
  3. an inverted cone bur.
  4. an endodontic pathfinder.

 

 

 

 

 

The answer is: D

 

3- Access cavity preparation of anterior teeth:

  1. is completed using a K-type file.
  2. often can result in lateral cervical or root surface perforations.
  3. often can result in labial cervical or root surface perforations.
  4. arc initiated using a no. 6 or 8 round bur.

 

 

 

 

 

The answer is: C

 

4- Fourth canals are usually found in:

  1. maxillary first premolars.
  2. maxillary second premolars.
  3. maxillary first molars.
  4. mandibular premolars.

 

 

 

 

 

The answer is: C

 

5- The fourth canal is often found in:

  1. the mesiobuccal root of the maxillary firsf molar.
  2. the mesial root of the maxillary first premolar.
  3. the palatal root of the maxillary first molar.
  4. the dtstobuccal root of the maxillary first molar.

 

 

 

 

 

The answer is: A

 

6- Entry into a maxillary central incisor is made:

  1. below (apical to) the cingulum in the direction of the long axis of the tooth.
  2. just coronal to the cingulum in the direction of the long axis of the tooth.
  3. to include the marginal ridges.
  4. with a slow-speed bur.

 

 

 

 

 

The answer is: B

 

 

7- Maxillary canines:

  1. are usually less than 25 mm long.
  2. are 25 mm or longer.
  3. possess extremely curved canals.
  4. have an anatomic apex distant from the apical foramen.

 

 

 

 

 

The answer is: B

 

8- Vertucci and colleagues describe that:

  1. 50% of the maxillary second premolars have one canal at the apex.
  2. maxillary second premolars that have two canals have two distinct apical foramin
  3. 75% of maxillary second premolars have one canal at the apex.
  4. accessory canals are more prevalent in maxillary second premolars than in incisors.

 

 

 

 

 

The answer is: C

 

9- The maxillary first molar:

  1. has a palatal root that curves lingually.
  2. has a distobuccal root with two canals ending in a common orifice.
  3. should be approached for endodontic treatment with the assumption that two canals exist in the mesiobuccal root.
  4. should be approached for endodontic treatment with the assumption that one canal exists in the mesiobuccal root.

 

 

 

 

 

The answer is: C

 

10- Mandibular incisors:

  1. often have two separate apical foramin
  2. two of five can have two separate canals.
  3. average 19 mm in length.
  4. arc less likely to be perforated labially than lingually during access preparation.

 

 

 

 

 

The answer is: B

 

11- Mandibular premolars:

  1. can have more than one canal 12% to 23% of the time.
  2. are less prone to acute exacerbations.
  3. rarely present complex mechanical problems.
  4. are on average, 19 mm long.

 

 

 

 

 

The answer is: A

 

12- Multiple accessory foramina:

  1. are more often present at the apex of the mandibular incisor.
  2. are more often present in the furcation of the maxillary premolar.
  3. arc more often present in the furcation of the mandibular first molar.
  4. are accessible for mechanical instrumentation.

 

 

 

 

 

The answer is: C

 

13- The mandibular first molar:

  1. has a fourth canal two-thirds of the time.
  2. has a fourth canal half the time.
  3. is the most difficult to treat.
  4. has a fourth canal one-third of the time.

 

 

 

 

 

The answer is: D

 

14- When a calcified root canal cannot be located or instrumented:

  1. extraction is the treatment of choice.
  2. retrograde and replantation procedures should be considere
  3. the dentist must proceed with the understanding that an unexplored or unfilled canal is worse than a perforation.
  4. it is no longer accessible to bacterial infection.

 

 

 

 

 

 

The answer is: B