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DH 101 > Chapter 6-1 Tooth development and Eruption > Flashcards

Chapter 6-1 Tooth development and Eruption Flashcards

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1
Q

Define odontogenesis

A

Process of tooth development

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2
Q

What are the stages of tooth development (time frame)

A
  1. Initiation: 6 - 7th week
  2. Bud: 8th week
  3. Cap: 9thweek
  4. Bell: 12th week
  5. Apposition: varies
  6. Maturation: varies
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3
Q

What are the main processes in each stage

A
  1. Initiation: Induction
  2. Bud: Proliferation
  3. Cap: Proliferation, differentiation, morphogenesis
  4. Bell: Proliferation, differentiation, morphogenesis
  5. Apposition: Induction, proliferation
  6. Maturation: maturation
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4
Q

When does odontogenesis of primary dentition occur

A

6th and 7th week

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5
Q

What occurs in the apposition stage?

A

Formation of partially mineralized dental tissue types, such as enamel, dentin, cementum (the hard tooth tissue)

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6
Q

What occurs during maturation

A

Structures go through continued mineralization

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7
Q

Induction

A

Active interaction between embryologic tissue types

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8
Q

At the beginning of 6th week what occurs?

A

The embryo’s stomodeum is lined by ectoderm

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9
Q

What does the outerpart of the ectoderm give rise to

A

oral epithelium

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10
Q

How is the dental lamina formed

A

When oral epithelium grows deeper into the ectomesenchyme

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11
Q

In what direction does the dental lamina grow

A

Starts in midline and progresses posteriorly

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12
Q

What happens in the bud stage

A
  • extensive proliferation of dental lamina into buds which penetrate the ectomesenchyme
  • Proliferation of ectomesenchyme
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13
Q

What does the cap stage involve

A

Proliferation and differentiation to form tooth germ and primordium of primary tooth

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14
Q

What does the tooth germ consist of?

A

Enamel organ, dental papilla, dental sac

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15
Q

What is the predominant process in cap stage

A

morphogenesis

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16
Q

How is the dental papilla formed

A

ectomesenchyme in the concavity of the cap condenses into a mass

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17
Q

What does the dental papilla give rise to

A

Dentin and pulp

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18
Q

What is the dental sac/dental follicle?

A

remaining ectomesenchyme that surrounds the outside of the cap of enamel organ

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19
Q

What does the dental sac produce

A

Periodontium
Supporting tissue types of the tooth
Cementum
Periodontal ligament
Alveolar process

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20
Q

Tooth germ consist of:

A

Enamel organ
Dental papilla
Dental sac

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21
Q

What does the enamel organ…
Arise from?
Origin?
Give rise to?
Description

A

Arises from oral ectoderm and dental lamina
Epithelial origin
Gives rise to enamel
Develops different layers during cap and bell stages of development

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22
Q

What does Dental Papilla…
Arise from?
Origin
Give rise to?
Description

A

Arises from ectomesenchyme
Connective tissue origin
Forms dentin and pulp
A condensed zone of cells beneath enamel organ and separated from by a basement membrane

23
Q

What does the Dental sac (Follicle)…
Arise from?
Origin
Give rise to?
Description

A

Arises from ectomesenchyme
Connective tissue origin
Form cementum, periodontal ligament, alveolar bone
Fibrous tissue

24
Q

What are the 4 cell types that occur during bell stage

A

Outer enamel epithelium
Stellate reticulum
Stratum intermedium
Inner enamel epithelium

25
Q

What cells make up the outer enamel epithelium?

A

Cuboidal cells of enamel organ

26
Q

What cells makes up the inner enamel epithelium?

A

Tall Columnar cells

27
Q

What type of cells is the stellate reticulum

A

start shaped cells

28
Q

What type of cells is the stratum intermedium

A

compressed flat to cuboidal cells

29
Q

What are the 2 layers of dental papilla histodifferentiation

A
  1. outer cells of dental papilla
  2. Central cells of dental papilla
30
Q

Outer cells of dental papilla become…

A

dentin secreting odontoblasts

31
Q

Central cells of the dental papilla become…

A

Promordium of dental pulp

32
Q

Dental sac undergoes histodifferentation _____(later than /before) enamel organ and dental papilla?

A

Later than

33
Q

Three types of tissues of dental sac in bell stage:

A

Cementum
Periodontal ligament
Alveolar process

34
Q

Apposition stage is also know as …

A

secretory stage

35
Q

What occurs during the apposition stage

A

Enamel, dentin, and cementum are secreted in successive layers

36
Q

What happens in the maturation stage

A

stage is reached when matrices of hard dental tissue fully mineralize to their correct levels

37
Q

How does tooth development occur

A

Begins in crown and proceeds to the root

38
Q

What are preameloblasts

A

IEE cells that grow columnar and elongate and differentiate

39
Q

What is repolarization

A

moving of nucleus away from basement membrane

40
Q

What cells undergo cellular repolarization in preameloblast formation

A

IEE

41
Q

What does IEE induce what cells to become what?

A

Induces dental papilla cells to differentiate into dentin-forming cells (odontoblasts)

42
Q

What does IEE themselves differentiate into?

A

Ameloblasts (cells that secrete enamel)

43
Q

Preameloblasts induce outer dental papilla cells to become what?

A

Odontoblasts

44
Q

Dentinogenesis

A

Lays down dentin matrix (predentin)

45
Q

When preameloblasts come into contact with the new predentin what occurs

A

preameloblasts differentiate into ameloblasts

46
Q

What triggers enamel formation

A

Dentin formation

47
Q

What is amelogenesis

A

Growth of enamel matrix

48
Q

What is the enamel matrix secreted from

A

Tomes Process

49
Q

What is the tomes process

A

angled distal part of ameloblast

50
Q

What is an odontoblastic process

A

Cellular extension in length of predentin

51
Q

What are odontoblastic processes contained in

A

Dentinal tubule

52
Q

What ultimately happens to cell bodies of odontoblasts

A

Remain in adjoining pulp attached by odontoblastic processes

53
Q

What ultimately happens to ameloblasts

A

lost after tooth eruption

DH 101 (11 decks)

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