MCQs in Endodontics

Chapter 8: Materials


 1 - The endodontic broach is used to:

  1. locate the orifices of the root canals.
  2. remove pulp tissue from the pulp spaces.
  3. smooth the walls of root canals.
  4. enlarge the root canal spaces.







The answer is: B


2 - The basic difference between K-type files and reamers is:

  1. the number of spirals or flutes per unit length.
  2. the geometric cross section.
  3. the depth of the flutes.
  4. the direction of the spirals.






The answer is: A


3- The major determining factor that influences the efficacy of root canal debridement is the

  1. type of hand instrument use
  2. irrigating solution.
  3. internal pulp space anatomy.
  4. instrumentation technique.






The answer is: C


4- The working portion of an endodontic condenser (plugger) is:

  1. smooth, tapered, and pointed
  2. smooth, tapered, and flat-ended
  3. smooth, of uniform width, and pointed
  4. smooth, of uniform width, and flat-ended






The answer is: B


5- Modification of the cross-sectional design of K-type files from square to rhomboid has resulted in significantly greater:

  1. torsional strength.
  2. tensile strength.
  3. stiffness.
  4. flexibility.






The answer is: D


6- Significant deviations from circular canal preparations will occur when using a:

  1. K-type reamer with a reaming action.
  2. K-type reamer with a filing action.
  3. K-type file with a reaming action.
  4. K-type file with a filing action.






The answer is: D



7- The Hedstrom file is most commonly used to:

  1. flare the canal.
  2. establish a circular preparation.
  3. prepare post space.
  4. locate canal orifices.






The answer is: A


8- The temperature of the gutta-percha extruded from the "lowlemperalure," thermoplastic injection system is:

  1. 160°
  2. 100°
  3. 70°
  4. 40°







The answer is: A


9- Some studies have reported that the most important aspect of irrigation is the:

  1. quantity of irrigant.
  2. chelating action of the solution.
  3. size of the needle.
  4. type of irrigant.






The answer is: A


10- Hardening of zinc oxide-eugenol is due to the:

  1. formation of zinc eugcnolat.
  2. presence of water.
  3. evaporation of eugenol.
  4. heat generated during the chemical reaction.






The answer is: A


11-With time and with exposure to light and air, gutta-percha:

  1. does not change its physical properties significantly.
  2. will decompose and lose mass.
  3. becomes more brittle.
  4. alters, but can be restored by freezing.






The answer is: C


12- Temporary canal medications are of various types. Which of the following seems to satisfy more criteria as to desirable properties:

  1. Formocresol.
  2. Chlorhcxidin.
  3. Potassium iodide.
  4. Calcium hydroxide.







The answer is: D


13- A disadvantage of Cavit as compared to IRM as a temporary restoration is that Cavit:

  1. does not have as much compressive strength.
  2. does not seal as well with time.
  3. is more susceptible to thermal changes.
  4. shrinks while setting.






The answer is: A


14- An inherent disadvantage of the gutta-percha/carrier systems is:

  1. the carrier corrosion or disintegration products are toxi
  2. difficulty in insertion.
  3. potential problems in retreatment.
  4. no means arc available to prepare the post space.






The answer is: C


15- The Canal Master intracanal instrument has some disadvantages over conventional instruments in that the Canal Master:

  1. will enlarge the canal unevenly.
  2. will result in more transportation if not precurve
  3. is more susceptible to breakage.
  4. cannot be utilized in all canal shapes.







The answer is: C


16- Thinking in terms of design, which of the following size-50 endodontic instruments made from the same steel would be most susceptible to fracture (separation):

  1. Triangular shaft file.
  2. Square shaft reamer.
  3. Rhomboid file.
  4. Hedstrom file.






The answer is: D


17- If you choose to temporarily seal the access cavity of a tooth with kalzinol, how thick should it be:

  1. 1 mm
  2. 2 mm
  3. 3 mm
  4. 4 mm





The answer is: C (Kalzinol is Zinc Oxide temporary cement)