MCQs in Endodontics

Chapter 9: Shaping the canals


1 - Root canal morphology should be:

  1. conical.
  2. cylindrical.
  3. three dimensional.
  4. predictable.

 

 

 

 

 

 

The answer is: C

 

 

2 - To achieve the objectives of vertical condensation, it is necessary to produce:

  1. a cylindrical canal.
  2. a conical canal.
  3. a tapering conical canal.
  4. a straight canal.

 

 

 

 

 

The answer is: C

 

3- To contain gutta-percha within the canal, instrumentation should result in:

  1. cleaning beyond the anatomic apex.
  2. cleaning beyond the radiographic apex.
  3. a cylindrical canal shape.
  4. the narrowest cross-sectional diameter at the terminus.

 

 

 

 

 

The answer is: D

4- To avoid external transportation of the root canal:

  1. precurve instruments.
  2. use large instruments.
  3. avoid the use of sodium hypochlorite.
  4. use vigorous instrumentation.

 

 

 

 

 

 

The answer is: A

 

5- According to the precepts of vertical condensation technology the apical foramen should be:

  1. as large as practicable.
  2. as small as practicable.
  3. oval.
  4. circular.

 

 

 

 

 

The answer is: B

 

6- The projected success of creating patency relies principally on:

  1. the choice of file type.
  2. irrigation.
  3. the first instrument to reach the apical terminus.
  4. the second instrument to reach the apical terminus.

 

 

 

 

 

The answer is: C

 

7- Reentry and/or reuse of previously utilized instruments is:

  1. capitulation
  2. recapitulation
  3. cleaning and shaping
  4. reworking

 

 

 

 

 

The answer is: B

 

8- Irrigation of the root canal achieves:

  1. debridement.
  2. dissolution of tissues.
  3. elimination of microbes.
  4. all of the above.

 

 

 

 

 

 

The answer is: D

 

9- Each time the canal is flushed an appropriate volume of irrigant is:

  1. 3 ml.
  2. 1 ml.
  3. 1 to 2 ml.
  4. 4 ml.

 

 

 

 

 

 

The answer is: C

 

10- Debridement is most effective:

  1. in large quantities.
  2. when used with recapitulation.
  3. when it remains in the canal between appointments.
  4. just prior to filling.

 

 

 

 

 

The answer is: B

 

11- Removal of the smear layer:

  1. is accomplished with irrigation.
  2. effectively reduces the microbial population.
  3. is unnecessary for effective cementation during root canal filling.
  4. is necessary for success.

 

 

 

 

 

 

The answer is: B

 

12- Biologic rationale dictates:

  1. over instrumentation
  2. under instrumentation.
  3. that the working length stop at the apical constriction.
  4. partial pulp removal.

 

 

 

 

 

The answer is: C

 

13- Blood at the tip of a paper point removed from the root canal indicates:

  1. possible hematom
  2. possible incomplete irrigation.
  3. possible incomplete instrumentation.
  4. possible root perforation.

 

 

 

 

 

 

The answer is: D

 

14-  Filing with a Hedstrom file results in:

  1. effective cutting on insertion.
  2. effective cutting on withdrawal.
  3. a lack of tactile sensation.
  4. narrower canal preparations.

 

 

 

 

 

 

The answer is: B

 

15- The crown-down preparation advocates beginning radicular access with:

  1. a smaller instrument first.
  2. pre curvature of a smaller instrument.
  3. a larger instrument first.
  4. removal of the clinical crown.

 

 

 

 

 

 

The answer is: C

 

16- To improve accuracy, negotiate curved canals, and reduce force of instrumentation, the following tools are recommended:

  1. carbon steel files.
  2. nickel titanium instruments.
  3. reamers.
  4. Hedstrom files.

 

 

 

 

 

 The answer is: B

 

17- Radicular access can be achieved by:

  1. first using a Gatcs-Gliddcn drill throughout half the canal length.
  2. after instrumentation to no. 10, employ the Gates-Glidden drill.
  3. after instrumentation to no. 25, employ the Gates-Glidden drill.
  4. avoid Gates-Glidden drills when possible.

 

 

 

 

 

 

The answer is: C

 

18- Furcal perforation is often the result of:

  1. oversized radicular access preparations.
  2. use of Hedstrom files.
  3. natural occurrence.
  4. use of K-type files.

 

 

 

 

 

 

The answer is: A

 

19- Magnification allowed in working length determination by paralleling technique is:

  1. None
  2. 1mm
  3. 2mm
  4. 3mm

 

 

 

 

 

 

The answer is: C