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Oral Histology > 2 Odontogenesis > Flashcards

2 Odontogenesis Flashcards

1
Q
A

Top: vestibular lamina

Bottom: primary dental lamina

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2
Q
A

Primary dental lamina

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3
Q
A

Primary dental lamina

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4
Q
A

L: vestibular lamina

R: epithelial bud

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5
Q
A

L: Epithelial bud

R: Vestibular lamina

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6
Q
A

Epithelial cap

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7
Q
A

Enamel knot

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8
Q
A

Tooth germ (primary central incisors)

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9
Q
A

Primary dental lamina

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10
Q
A

Vestibular lamina

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11
Q
A
  1. Enamel organ
  2. Dental papilla
  3. Dental follicle
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12
Q
A

Enamel organ

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13
Q
A

Dental follicle and dental papilla.

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14
Q
A

Dental papilla (ectomesenchyme)

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15
Q
A

Secondary dental lamina

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16
Q
A

Dental follicle

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17
Q
A

? = stratum intermedium cells

Bottom: inner epithelial cells of enamel organ (undifferentiated)

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18
Q
A

1/L: stratium intermedium

2/R: outer epithelial layer

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19
Q
A

1/L: inner epitheilal layer

2/R: outer epithelial layer

20
Q
A

UL: primary dental lamina stage

UR: epithelial bud stage

LL: epithelial cap stage

LR: epithelial bell stage

21
Q

What term is used for the origin and formation of the tissues of teeth?

A

Odontogenesis

22
Q

Epithelial buds begin to appear in which of the following embryonic weeks?
A. Third week

B. Fourth week.

C. Fifth week

D. Sixth week

A

3rd: stomodeum appears
4th: tongue appears
5th: facial processes merge

*6th: epithelial buds for the primary lower central incisors are the first to appear.

23
Q

Which of the following is the main function of the reduced enamel epithelium?

A. Attachment
B. Lysis
C. Protection
D. Eruption

A

C. Protects enamel surface from the surrounding CT prior to the emergence of the tooth in the oral cavity.

24
Q

Which of the following are functions of Hertwig’s epithelial root sheath? (More than one correct answer.)

A. Determines root length
B. Determine root dentin outline
C. Determine thickness of cementum
D. Determines the number of root canals of a tooth

A

B & D only. D. occurs at the diaphragm stage of the sheath, before the start of root formation.

25
Q

The epithelial buds for the permanent first molars appear during which of the following time frames?

A. Sixth interuterine week
B. Eighth interuterine week
C. Fourth interuterine month
D. Fifth interuterine month

A

C. First permanent bud to appear.

D. (centeral incisors at fifth interuterine month)

26
Q
A

Cementoblast

Ameloblast

Odontoblast

27
Q

What is the term used for the origin and formation of dentin tissue?

A

dentinogenesis

28
Q

T/F: Odontogenesis is defined as the origin and formation or development of dentin tissue from the undifferentiated cells of the germ layers of the embryo.

A

False. Odontogenesis is the origin and formation of all the tissues of teeth, not just the dentin tissues.

29
Q

The primary dental lamina appears during which of the following embryonic weeks?

A.Third week
B.Fourth week
C.Fifth week
D.Sixth week

A

D. Sixth embryonic week, primary dental lamina first appears in the anterior area and passes posteriorly as a continuous horseshoe shaped epithelial band.

30
Q

Which of the following cell types arise from the undifferentiated or stem cells of the dental follicle?

A.Fibroblast
B.Cementoblast
C.Osteoblast
D.Osteoclast

A

A. This cell type becomes a constituent of the PDL and is responsible for the synthesis and lysis of the intercellular substances of the PDL.

B. This cell type becomes a constituent of the PDL and is responsible for the synthesis of cementum tissue.

C. This cell type becomes a constituent of the PDL and is responsible for the synthesis of alveolar bone.

31
Q

What is the term used for the origin and formation of enamel tissue?

A

Amelogenesis

32
Q

The dental follicle of a tooth germ matures to become which of the following specific tissues of the periodontium?

A. Alveolar bond
B. Cementum
C. Periodontal ligament
D. Gingiva

A

C, PDL. The dental follicle undergoes maturation to become the PDL that continues to house the cells that arose from the stem cells of the follicle.

33
Q

Ameloblasts originate from which epithelial cell layer of the enamel organ?

A

Inner enamel epithelium

34
Q

Odontoblasts arise from undifferentiated cells of which of the following tissues?

A. Enamel organ
B.Dental follicle
C.Dental lamina
D.Dental papilla

A

D. Dental papilla, odontoblasts arise from undifferentiated cells of the dental papilla, a type of mesenchymal tissue (embryonic or young CT).

35
Q

Which mineralized tissue is the first to appear within a tooth germ?

A

Which mineralized tissue is the first to appear within a tooth germ?

36
Q

Which of the following sites are tissues of a tooth germ?
A. Dental lamina
B. Enamel organ
C. Dental papilla
D. Dental follicle

A

B. Epithelial tissue of tooth germ

C. One of two mesenchymal or ectomesenchymal tissues of a tooth germ. Becomes pulp tissue of a tooth.

D. One of two mesenchymal or ectomesenchymal tissues of a tooth germ. Becomes the periodontal ligament tissue.

37
Q

T/F: The secondary dental lamina arises from the oral epithelium.

A

False. It arises from the lingual side of the primary dental lamina.

38
Q

The clear or acellular layer of the tooth germ lies immediatley between which of the following two sites?

A.Outer and stellate reticulum cell layers
B.Outer cell layer and dental follicle
C.Stratum intermedium and inner cell layers
D.Inner epithelial cell layer and dental papilla

A

D

39
Q

The epithelial bud becomes the epithelial cap which becomes which of the following?

A.Dental follicle
B.Dental papilla
C.Enamel organ
D.Dental sac

A

C. The organ is shaped like a bell an dis comprised of four distinct epithelial cell layers.

40
Q
A

From top,

  1. Stallate reticulum
  2. Outer
  3. Inner
  4. Stratum intermedium
41
Q

Which of the following cells are specialized CT cells?

A.Ameloblast
B.Odontoblast
C.Cementoblast
D.Undifferentiated mesenchymal cell

A

A: No, epithelial cell specialized to secrete enamel tissue.

B: Yes, CT cell specialized to produce dentin tissue.

C: Yes, CT cell specialized to produce cementum tissue.

D: No, not considered specialized. Pluropotential cell that develops into different types of specialized cells (cementoblast, odontoblast, osteoblast, fibroblast).

42
Q

Epithelial buds evolve directly from cells of which of the following structures?
A. vestibular lamina

B. Lamina propria

C. Dental laminae

D. Basal lamina

A

C. Dental laminae; bud signifying the site of tooth development.

43
Q
A
  1. Dentin
  2. Stellate reticulum layer
  3. Outer cell layer
  4. Inner cell layer
  5. Hertwig’s root sheath
  6. Dental papilla
44
Q

The four layers of the enamel organ merge to form a stratified squamous epithelial layer over the enamel surface. What is the term used for this epithelial layer?

A.Sulcular epithelium
B.Junctional epithelium
C.Reduced enamel epithelium
D.Hertwig’s epithelial root sheath

A

C. Covers and attaches to the entire surface of enamel prior to tooth emergence into the oral cavity.

45
Q

Which of the following are invaginations of the stomodeal epithelium? (More than one correct answer.)

A.Sulcus terminalus
B.Vestibular lamina
C.Primary dental lamina
D.Secondary dental laminae

A

A.No, not an invagination. Marks the junction between the anterior 2/3 and posterior 1/3 of tongue.
B.Yes, solid band of epithelial cells whose middle cells die off, leaving an epithelial lined trough called the “vestibule.”
C.Yes, extends as an epithelial band along the dental arches. Cells along its deep end become epithelial buds, sites of tooth development.
D.No, lingual extensions from the primary dental lamina, not the stomodeal epithelium. Epithelial buds of succedaneous teeth develop at the deep end of each secondary dental lamina.

46
Q
A
  1. Oral epithelium
  2. Reduced enamel epithelium
  3. Enamel
  4. Dentin
  5. Pulp
47
Q

Which of the following two cell layers of the enamel organ come together to form Hertwig’s epithelial root sheath?

A.Inner and stratum intermedium layers
B.Outer and stellate reticulum layers
C.Inner and stellate reticulum layers
D.Outer and inner layers

A

D

Oral Histology (9 decks)

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