MCQs in Endodontics

Chapter 21: Restorations after RCT

 

 1- Pulpal degeneration increases:

  1. with the complexity of the restoration.
  2. with the degree of periodontal disease.
  3. with time, following insertion of the restoration.
  4. all of the above.

 

 

 

 

 

 

 

The answer is: D

 

2- Endodontic access through existing crowns:

  1. usually has no effect on porcelain strength.
  2. does not cause separation of the porcelain veneer from the metal substructure.
  3. often leads to excessive removal of coronal tooth structure.
  4. should not be performed.

 

 

 

 

 

The answer is: C

 

 3- During the restorative examination prior to endodontic therapy:

  1. the strategic value of the tooth is of minor significance.
  2. a critical amount of solid coronal dentin is required.
  3. the ferrule has no effect on the incidence of root fracture.
  4. if insufficient tooth structure remains to withstand functional forces, the tooth should always be extracted.

 

 

 

 

 

 The answer is: B

 

 4- In endodontically treated teeth:

  1. decreased strength is due to the loss of coronal tooth structure.
  2. decreased strength is a direct result of the endodontic treatment.
  3. mandibular teeth are stronger than maxillary teeth.
  4. all of the above.

 

 

 

 

 

 

The answer is: A

 

 5- The dowel functions primarily:

  1. to retain the core material.
  2. to strengthen the tooth.
  3. to distribute forces along the length of the root.
  4. to decrease the risk of root fracture.

 

 

 

 

 

 

The answer is: A

 

 6- Guidelines for dowel length in a tooth with normal periodontal support include:

  1. two thirds of the length of the canal,
  2. the coronal length of the tooth.
  3. one half the bone-supported length of the tooth.
  4. all of the above.

 

 

 

 

 

 

The answer is: D

 

 7- Dowel features that contribute the greatest retention are:

  1. increased length, parallel sides, and moderate diameter.
  2. increased length, taper, and serrated surface.
  3. increased length, parallel sides, and serrated surface.
  4. increased length, taper, and smooth surface.

 

 

 

 

 

 

The answer is: C

 

8- Compared to nickel-chrome dowels, titanium dowels are:

  1. stronger.
  2. less radiopaque.
  3. more allergenic.
  4. more economical.

 

 

 

 

 

 

 

The answer is: B

 

9- The microleakage phenomenon is greatest with:

  1. composite resin core.
  2. amalgam core.
  3. glass ionomer core.
  4. cast post and core.

 

 

 

 

 

 

The answer is: A

 

10- Which material should be avoided in teeth with high esthetic value:

  1. Composite resin.
  2. Glass ionomers.
  3. Amalgam.
  4. Cast post and core.

 

 

 

 

 

 

The answer is: C

 

 11- Which endodontically treated teeth always require a dowel, a core, and crown:

  1. Fixed partial denture abutments.
  2. Removable partial denture abutments.
  3. C- Individual teeth.
  4. None of the above.

 

 

 

 

 

 

The answer is: B

 

 12- The ferrule:

  1. significantly reduces the incidence of fracture.
  2. must not terminate on restorative material.
  3. is a metal band encircling the external dimension of the residual tooth.
  4. all of the above.

 

 

 

 

 

The answer is: D

 

 13- For dowel space preparation:

  1. gutta-percha is removed using heat, rotary instruments, or solvents.
  2. gutta-percha removal should be done 48 hours or more after root canal filling.
  3. intimate contact of the dowel and dentin is not necessary for passive dowel systems.
  4. to refine the dowel space dowel drills must be used in a dental handpiece.

 

 

 

 

 

The answer is: C

 

 14- Regarding cementation of the dowel:

  1. zinc phosphate and glass ionomer cements increase resistance to fracture.
  2. zinc phosphate and resin cements inhibit marginal leakage.
  3. retention is greatest when both the dowel and canal are coaled with cement.
  4. the dowel is seated with finger or biting pressure.

 

 

 

 

 

 

The answer is: C