MCQs in Oral Histology

Chapter 3: Eruption

 

1- Which of the following pairs of movements predominate during the post-eruptive period?

  1. Distal and lingual.
  2. Axial and mesial.
  3. Distal and axial.
  4. Axial and rotational.

 

 

 

 

 

 

The answer is: B

 

2- Passive eruption is:

  1. Growth in the length of the root.
  2. Apical migration of the junctional epithelium.
  3. Deposition of bone at the fundus.
  4. The formation of cellular cementum.

 

 

 

 

 

 

The answer is: B

 

3- Which of the following does not occur during the eruptive phase?

  1. Dentin deposition.
  2. Narrowing of apical foramen.
  3. Increased thickness of cementum.
  4. Enamel formation.

 

 

 

 

 

 

The answer is: D

 

4- During the pre-eruptive phase of tooth eruption:

  1. Cementoblasts begin to secrete cementoid.
  2. The apical foramen is beginning to close.
  3. The developed tooth at the bell stage lies within a crypt of bone.
  4. The root is formed.

 

 

 

 

 

 

The answer is: C

 

  5- Which of the following occurs during the pre-eruptive stage of eruption of a tooth:

  1. Differentiation of the stratum intermedium.
  2. Formation of the dental sac.
  3. Formation of stellate reticulum.
  4. Maturation of enamel.

 

 

 

 

 

 

 

The answer is: D

 

  6- Active eruption of the tooth:

  1. Begins as soon as the roots have begun to develop.
  2. Begins when the apical cementum is deposited on the roots of the tooth.
  3. Begins as the occlusal tip starts moving towards the occlusal plane.
  4. Continues until exposure of the cementum has occurred.

 

  

 

 

 

 

 

The answer is: A

 

7- The root formation theory of eruption proposes, that eruption is due to the push of the:

  1. Expanding pulp in the root canals against the alveolar crypt.
  2. Elongating roots against the base of the alveolar crypt.
  3. Elongating roots against the Hammock ligament.
  4. Proliferating periodontal ligament.

 

 

 

 

 

 

 

The answer is: D

 

8-Actual eruptive movements of tooth occur mainly in a :

  1. Horizontal direction.
  2. Complex pattern.
  3. Axial direction.
  4. Rotational direction.

 

 

 

 

 

 

 

The answer is: C

 

9-Which of the following does not occur in the active phase of tooth eruption:

  1. Organization of a periodontal ligament from the dental follicle.
  2. Gradual separation of attachment epithelium from the enamel surface.
  3. Root formation.
  4. Occlusal wear.

 

 

 

 

 

 

The answer is: D

 

 10-The most likely factor responsible for tooth eruption is:

  1. Vascular pressure.
  2. The developing periodontal ligament.
  3. Bone growth.
  4. The growing root.

 

 

 

 

 

 

 

The answer is: B

 

 11-All of the following statements about the eruption of a permanent tooth and the exfoliation of its predecessor are true, except:

  1. Prior to eruption, the permanent tooth is completely formed.
  2. Resorption of deciduous roots is an intermittent process.
  3. Earliest resorption of deciduous roots is on root surface, facing the permanent tooth.
  4. Eruptive movements of the permanent tooth may not be solely responsible for deciduous root resorption.

 

 

 

 

 

 

 

The answer is: A

 

12-When a tooth first erupts into the oral cavity, the attachment epithelial cuff is composed of epithelium derived from:

  1. Dental lamina.
  2. Epithelial rests of Malassez.
  3. Reduced dental epithelium.
  4. Epithelial root sheath of Hertwig's.

 

 

 

 

 

 

 

The answer is: C

 

13- In the posteruptive phase a tooth undergoes primarily:

  1. Rotational movement.
  2. Movements in a distal direction.
  3. Movements in an apical direction.
  4. Movements in an axial & mesial direction.

 

 

 

 

 

 

 

The answer is: D

 

   14- During tooth eruption, the permanent successors of the primary teeth move occlusaly and:

  1. Mesially
  2. Buccally
  3. Lingually
  4. Distally

 

 

 

 

 

 

The answer is: B

 

  15- During tooth eruption into the oral cavity, what happens to the epithelial covering of the enamel:

  1. It remains as the primary cuticle.
  2. It units with the oral epithelium and then degenerates.
  3. It is replaced by oral epithelium and then degenerates.
  4. It units with the oral epithelium and becomes primary cuticle.

 

 

 

 

 

 

 

The answer is: B

 

  16- During tooth eruption, bone formation is often seen at the base of socket. This newly formed bone is usually in the form of:

  1. Coarse fibered woven bone.
  2. Compact bone.
  3. Radiating bone.
  4. Horizontal trabeculae.

 

 

 

 

 

 

The answer is: D

 

17-The pre-eruptive phase:

  1. Begins in the late bell stage.
  2. Begins in the early bell stage.
  3. Begins in the beginning of root formation.
  4. Begins in the cap stage.

 

 

 

 

 

 

The answer is: B

 

18- Types of movement during the pre-eruptive phase:

  1. Axial- eccentric.
  2. Eccentritilting.
  3. Bodily-eccentric.
  4. Bodily- axial.

 

 

 

 

 

 

The answer is: C

 

19- Eruptive phase:

  1. Accompanied by bleeding of the gingival.
  2. No discomfort or pain.
  3. Eruptive teeth move at different speeds, at different times.
  4. Has only axial occlusal movement.

 

 

 

 

 

 

The answer is: C

 

20-Histological changes occurring during the eruptive phase:

  1. Root formation only.
  2. Formation of the attachment apparatus only.
  3. Dento- gingival junction appearance only.
  4. All of the above.

 

 

 

 

 

 

 

 

The answer is: C