MCQs in Oral Histology

Chapter 7: Cementum

 

 

1- Cementum may cover part of the enamel due to:

  1. Premature differentiation of cementoblasts.
  2. Destruction of the reduced enamel epithelium covering this part.
  3. Malfunctioning of the maturative ameloblasts.
  4. Premature destruction of the epithelial root sheath of Hertwig.

 

 

 

 

 

 

 

The answer is: B

 

2- Which of the following cell is responsible for cementogenesis?

  1. Ameloblast
  2. Osteoblast
  3. Cementoblast
  4. Odontoblast

 

 

 

 

 

 

 

The answer is: C

 

3- Which of the following is true about cementum? It:

  1. Provides nutrients to secondary dentin in the root.
  2. Provides for the attachment of principal periodontal fibers.
  3. Contains neural receptors.
  4. Is more easily resorbed than bone.

 

 

 

 

 

 

 

 

The answer is: B

 

4- Which of the following is not a feature of cellular cementum?

  1. Lacunae and canaliculi.
  2. Continuous remodeling.
  3. Sharpey's fibers.
  4. Incremental lines.

 

 

 

 

 

 

 

The answer is: B

 

5- Cementum may be deposited on the surface of enamel as a consequence of:

  1. Early degeneration of Hertwig's sheath.
  2. Injury to the reduced enamel epithelium.
  3. Late degeneration of Hertwig's sheath.
  4. During passive eruption.

 

 

 

 

 

 

 

The answer is: B

 

6- Cementoblasts:

  1. Are derived from the dental papilla.
  2. Secrete both collagen and glycosaminoglycans.
  3. Are multinucleated cell.
  4. May become incorporated into acellular cementum.

 

 

 

 

 

 

 

 

 The answer is: B

 

7- Which of the following is not present inside both cellular and acellular cementum: 

  1. Cementoblasts
  2. Hydroxyapatite crystals.
  3. Incremental lines.
  4. Sharpey's fibers.

 

 

 

 

 

 

 

 

The answer is: A

 

8- Which of the following does not increase normally with age?

  1. Pulp stones.
  2. Dentin sclerosis.
  3. Interglobular dentin.
  4. Cementum thickness.

 

 

 

 

 

 

 

 

The answer is: C

 

9-human teeth contain varities of cementum:

  1. acelllular extrinsic fiber cementum.
  2. cellular intrinsic fiber cementun.
  3. mixed stratified cementum.
  4. all of the above.

 

 

 

 

 

 

 

The answer is: D

 

10-Incremental lines of Salter are:

  1. highly mineralized areas having less collagen and great amount of  mucopolysaccharides.
  2. hypomineralized areas containing less collagen and great amount of  mucopolysaccharides.
  3. unmineralized areas containing no collagen nor mucopolysaccharides.
  4. similar to cementum mineralization.

 

 

 

 

 

 

 

The answer is: A

 

11-cementum hypertrophy occurs:

  1. in non functioning teeth.                
  2. functioning teeth.
  3. in embedded teeth.                           
  4. in malposed tooth.

 

 

 

 

 

 

 

The answer is: B

 

12-Cementoblasts are derived from:

  1. epithelial root sheath of Hertwig.
  2. epithelial rests of Malassez.
  3. cells of dental papilla.
  4. ectomesenchymal cells of tooth sac.

 

 

 

 

 

 

 

 

The answer is: D

 

13- Persistance of epithelial root sheath of Hertwig will result in:

  1. Formation of intermediate cementum.
  2. No cementum formation.
  3. Formation of acellular cementum.
  4. Formation of accessory root canal.

 

 

 

 

 

 

 

 

The answer is: B