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Sp24 - Oral Histology and Embryology > (E1) 5 -Odontogenesis Part III: Root and Periodontitum Development > Flashcards

(E1) 5 -Odontogenesis Part III: Root and Periodontitum Development Flashcards

Exam 1 - BLANKENSHIP

1
Q

With enamel thickness reached, ________ can occur

A

root formation

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1
Q

During crown development enamel and dentin secretion occurs from the
_______ to the __________

A
  • tip of the cusp
  • cervical margin/tooth cervix
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2
Q

Cervical margin is the future site of the ___________

A

Cementoenamel Junction

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3
Q

What does HERS separate?

A

The two ectomesenchyme derived regions: dental papilla and dental follicle

  • Remains open at the apical margin
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4
Q

What is HERS integral to?

A
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5
Q

Breakdown of HERS and radicular dentin deposition induces _______________

A

differentiation of the dental follicle

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6
Q

What is HERS?

A
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7
Q

What is the dental papilla?

A
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8
Q

What is the dental follicle?

A
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9
Q

What is the outcome of reciprocal induction?

A

Secretion and mineralization of hard tisses of the root (dentin and cementum)

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10
Q

What is the functional period of deciduous teeth?

A

About 7-8 years

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11
Q

Priamry Teeth: When does root development complete?

A

1.5 years after emerging into the oral cavity

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12
Q

Permanent Teeth: When does root development complete?

A

About 3.5 years after emerging into the oral cavity

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13
Q

Events of Root Formation - What is happening during initiation?

A
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14
Q

Events of Differentiation of Odontoblasts - What layer induces this and where?

A
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15
Q

Events of Deposition: Where do you find Predentin and Mineralized dentin?

A
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16
Q

Events of Fragmentation of HERS: What induces it and what is left remaining?

A
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17
Q

Events of Differentiation of Periodontium: What is exposed and what does this cause then?

A
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18
Q

HERS grows ______

A

apically

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19
Q

How does HERS regulate root formation?

A
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20
Q

The rim of HERS (proliferating end) bends 45 degrees creating the ___________

A

epithelial diaphragm

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21
Q

The epithelial diaphragm contributes to ______ (3 things)

A
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22
Q

Initiation of Root Formation: Teeth with one root

A
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23
Q

Initiation of Root Formation: Teeth with multiple roots

A
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24
Q

What is Taurodontism?

25
Q

Cells of the IEE layer of HERS induce differentiation of _________ from outermost layer of dental papilla

A

odontoblasts (contributes to root lengthening)

26
Q

Odontoblasts secrete _______ adjacent to HERS

A

predentin matrix

27
Q

Predentin mineralizes into _______ adjacent to HERS

A

radicular dentin

28
Q

Dentin classified by time of deposition: Describe the two types.

29
Q

Describe dentin types based on location (4 types)

30
Q

After first layer of radicular dentin is formed, HERS layers separate into clusters of cells. What are the two possible outcomes?

31
Q

Epithelial cell rests function to ________ (4)

32
Q

Epithelial cell rests (ECR) may serve as stem cell sources to ______

33
Q

What is the result?

34
Q

What is included in the periodontium?

A

Includes cementum, PDL, alveolar bone

35
Q

What is the function of the periodontium?

A

Supporting and anchoring apparatus of the tooth

36
Q

Contact of dental follicle with newly-formed dentin induces differentiation. Describe what is happening in the three layers.

37
Q

When does the alveolar bone (tooth socket) begin forming?

A

During differentiation of the periodontium

38
Q

Describe what hapens due to an abnormal breakdown of HERS

39
Q

_______ is a thin layer of mineralized CT that covers the outer layer of the
root

40
Q

Functions of Cementum

41
Q

Describe Cementum - composition and presentation

42
Q

Location: Primary cementum

A

Cervical (coronal) 2/3

43
Q

Location: Secondary cementum

A

Mid to Apical 1/3 and around the furcation zone

44
Q

Location: Acellular Cementum

A

Cervical 2/3

45
Q

Location: Cellular Cementum

A

Apical 1/3

46
Q

Location: Extrinsic fiber cementum

A

Cervical 2/3

47
Q

Location: mixed fiber cementum

A

apical 1/3 and furcation zone

48
Q

Location: intrinsic fiber cementum

A

depends on the type of cementum

49
Q

First location of cementum is the ______

A

cementoenamel junction (CEJ)

50
Q

What are the three variations of cementum at the CEJ?

51
Q

Primary cementume provides anchor for ____ to ______

A
  • tooth
  • alveolar bone
52
Q

Slow deposition of primary cementum allows ______ to become trapped within
cementum

A

PDL fibers (Sharpey’s fibers)

53
Q

After _____, secondary cementum is secreted

54
Q

______ is a soft, specialized CT connecting the tooth to the alveolar bone

55
Q

Function of the PDL

56
Q

Functions of Alveolar Proper

57
Q

Osteoblasts cluster and secrete osteoid via _________

A

intramembranous ossification

58
Q

Describe Basal Bone

59
Q

Describe Alveolar Bone Proper

60
Q

What are the four stages of root development?

Sp24 - Oral Histology and Embryology (7 decks)

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