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Oral Histology > 6 Eruption & Shedding > Flashcards

6 Eruption & Shedding Flashcards

1
Q

The movements that a tooth makes to attain and maintain its position in the jaw describes which of the following events?

A. odontogenesis
B. shedding
C. exfoliation
D. eruption

A

A. formation/development of tooth tissues
B. physiological elimination of primary teeth
C. elimination of primary teeth
D. eruption

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2
Q
  1. Which is prefunctional stage of eruption?
A

L: YES! Here, Hertwig’s root sheath outlines the root dentin.

R: No, the prefunctional stage begins with the formation of root dentin. Here, there is no sign of root dentin.

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3
Q
  1. Hertwig’s root sheath
    Cementum
    Reduced enamel epithelium
A

Top: REE
Middle: cementum
Bottom: Hertwig’s sheath

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4
Q
  1. During the prefunctional stage of eruption, a tooth mainly moves toward which of the following directions?

A. mesially
B. facially
C. occlusally
D. apically

A

A. This is the main movement during the functional stage.
B. This is the main movement during the preemergence phase.
C. Yes!
D. No, teeth normally do not move in this direction.

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5
Q

Physiological mesial drift is the main movement during which of the following stages of eruption?

A. preemergence
B. prefunctional
C. functional

A

A. The main movement during this stage is directed facially.
B. The main movement during this stage is directed occlusally.
C. Yes!

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6
Q

Which of the following events occur during the prefunctional stage of eruption? (More than one correct answer.)

A. Amelogenesis
B. Cementogenesis
C. Periodontal ligament formation
D. Start of dentinogenesis

A

A. No, during preemergence stage.
B. Yes.
C. Yes, dental follicle matures to PDL.
D. Begins in preemergence and continues through other stages of eruption.

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7
Q
  1. Hertwig’s diaphragm
    Hertwig’s epithelial root sheath
    Reduced enamel epithelium
A

Reduced enamel epithelium
Hertwig’s epithelial root sheath
Hertwig’s diaphragm

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8
Q
  1. T/F: The reduced enamel epithelium becomes the primary junctional epithelium during the prefunctional stage of eruption.
A

True. The REE is attached to the tooth surface, and as the junctional epithelium it remains attached to the tooth surface.

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9
Q

9.

A

REE
HERS

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10
Q
  1. Which mark HERS?
A

1. Yes. The sheath has separated from the root and cementogenesis has occured.

  1. No - REE
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11
Q
  1. Match the stage of eruption to the tooth in that stage.

Preemergence, Prefunctional, Functional

A

Functional
Prefunctional
Preemergence

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12
Q

T/F: Hertwig’s epithelial root sheath determines the number of roots a tooth will develop.

A

False. Determines number of root canals, not number of roots.

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13
Q
  1. Which is in prefunctional stage of eruption?
A
  • *1. Yes**
    2. No, preemergence.
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14
Q

Hertwig’s epithelial root sheath serves which of the following functions? More than one correct answer.

A. Determines root length.
B. Determines outline of root dentin.
C. Determines number of roots.
D. Determines number of root canals.

A

A, C. No

B, D. Yes

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15
Q

During th epreemergence stage of eruption, the main movement of a tooth is in which of the following directions?

A. occlusally
B. mesially
C. facially

A

C

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16
Q
  1. The permanent first molar marked by the arrow is in which stage of eruption?
A

Prefunctional. Root dentin formation is in evidence.

17
Q
  1. The tooth is in which stage of eruption?
A

Preemergence

18
Q

Amelogenesis occurs during which of the following stages of eruption?

A

Preemergence. Enamel foramtion is completed by the end of this stage of eruption.

19
Q

T/F: Exfoliation is the term used to describe the movements a tooth makes to attain and maintain its position in the jaw.

A

False, eruption.

20
Q

Epithelial rests of Malassez are rudiments of which of the following structures?

A. reduced enamel epithelium
B. cervical loop
C. diaphragm
D. Hertwig’s epithelial root sheath

A

D. Yes, this is their origin. They become entrapped in the PDL during the prefunctional stage of eruption.

21
Q

What is the term used to describe the physiologic elimination of teeth?

A. eruption
B. sloughing
C. shedding
D. molting

A
  1. C.
22
Q

Which of the following types of dentition are eliminated physiologically?

A. primary
B. permanent
C. mixed

A

A

23
Q

What is the direct cause of the physiologic elimination of teeth?

A. tention
B. pressure
C. cellular activity
D. traction

A

**C **by odontoclasts

24
Q
  1. Odontoclast, Dentin, Cementum
A

Cementum
Dentin
Odontoclast

25
Q

Which of the listed cells are responsible for the physiological resorption of tooth tissues?

A. osteoclasts
B. fibroclasts
C. odontoclasts
D. A & C

A

A. not resorptive cells of tooth tissues.
B. No, they resorb, lysis, pulp tissue, but not the mineralized tissues.
C. They resorb mineralized tissues of tooth, but not pulp tissue.
D. Yes! Both cell types are responsible for the resoprtion of tooth tooth tissues.

26
Q

Which of the following tissues are subject to physiological resorption? (More than one correct answer.)

A. enamel
B. dentin
C. cementum
D. pulp

A
  • *A. Yes,** during shedding.
  • *B. Yes,** during shedding.
  • *C. Yes,** first tissue during shedding.
  • *D. Yes,** undergoes resorption or lysis by action of fibroclasts during shedding.
27
Q

The stem cells for odontoclasts originate in which of the following sites?

A. periodontal ligament
B. lamina propria of the gingiva
C. periosteum of alveolar process
D. bone marrow

A

D

28
Q

T/F: Permanent teeth do not undergo resorption.

A

False, they are subject to resorption, but not physiological resorption. Its conditional.

29
Q

From knowledge of odontogenesis, which primary teeth are first to start and complete shedding?

A. incisors
B. canines
C. first molars
D. second molars

A

A. Yes, they are the first to: begin formation, emerge into oral cavity, start shedding, and complete shedding.

30
Q

Physiologically, shedding starts on which anatomic side of a primary tooth?

A. facial
B. distal
C. apical
D. lingual

A

C. No, this is the side where the shedding moves from its initial side, ending site.
D. Yes, this is where odontoclasts are first seen.

Oral Histology (9 decks)

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