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DEN 7111 Development > Exam 2 10/16 Intro to Tooth Development > Flashcards

Exam 2 10/16 Intro to Tooth Development Flashcards

1
Q

Teeth make up ____ of the surface area of the mouth

A

20% (upper a little more than the lower arch)

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2
Q

Functions of teeth

A
  • mastication
  • speech
  • esthetics
  • weapons of attack and defense
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3
Q

What makes up a tooth?

A
  • enamel
  • dentin
  • pulp
  • periodontium (cementum, periodontal ligament, alveolar bone)
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4
Q

____ is soft connective tissue

A

Pulp

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5
Q

What is the difference between anatomical and clinical cervix?

A

Depends on where the gingiva ends - if it ends at the cervical margin, anatomical = clinical cervix. If it ends higher, clinical cervix is longer than the anatomical cervix

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6
Q

When do hard tissues get deposited in the developing teeth?

A

11-12 weeks

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7
Q

Initial signs of tooth development is at __ weeks

A

6

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8
Q

How long does tooth development take?

A

18-25 years (considering wisdom teeth that are the last ones to erupt)

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9
Q

Enamel is derived from:

A

Oral ectoderm/epithelium

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10
Q

What structures of a tooth are derived from ectomesenchyme?

A
  • dentin
  • pulp
  • cementum
  • periodontal ligament
  • portion of alveolar bone
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11
Q

What structures arise from the dental papilla?

A

Dentin, pulp

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12
Q

What structures arise from the dental follicle/sac?

A
  • cementum
  • periodontal ligament
  • portion of alveolar bone
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13
Q

The earliest histological indication of tooth development is at:

A

11 days (thickening of oral epithelium where tooth formation will occur on the oral surface of the first pharyngeal arch)

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14
Q

____ is essential for the initiation of tooth development; maintained by _____

A

First arch epithelium; cells of dental papilla

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15
Q

What happens to the primary epithelial band?

A

Thickens as a result of different planes of cell division and grows into the underlying ectomesenchyme - leads to formation of dental lamina and vestibular lamina

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16
Q

As the primary epithelial band thickens, what happens to the surrounding ectomesenchyme?

A

Condenses around area of dental lamina; tooth bud continues to grow and reshape in relation to the ectomesenchyme condensing around it

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17
Q

Where does the vestibular lamina form in relation to the dental lamina?

A

Buccal

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18
Q

What eventually happens to the vestibular lamina?

A

Eventually degenerates so that there is no connection between lip and alveolar process (so vestibules form properly)

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19
Q

When does the primary epithelial band form?

A

Around 37 days

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20
Q

How many dental laminas form in total?

A

10 in each arch (20 primary teeth)

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21
Q

Where is the basement membrane found in the tooth bud?

A

Between ectomesenchyme and oral epithelium (around the round part of the bud)

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22
Q

Where does permanent dentition arise from?

A

Dental lamina; Permanent molars are an exception, as they are derived from the backgrowth of the primary epithelial band

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23
Q

Stages of tooth development (8)

A
  1. Bud
  2. Cap
  3. Bell
  4. Early Crown Dentinogenesis
    E. Crown amelogenesis
    F. Late crown formation
    G. Root formation and eruption
    H. Function
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24
Q

____ is always produced before ____ during crown formation

A

Dentin always produced before enamel

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25
Q

Which stage of tooth development is most complex histologically?

A

Bell

26
Q

First epithelial incursion into ectomesenchyme of the jaw occurs during:

A

Bud stage

27
Q

What components make up bud?

A

Dental lamina (poking finger), oral epithelium towards the top

28
Q

What happens during cap stage?

A

proliferation of epithelium, ectomesenchyme condensation increases around the cap (enamel organ)

29
Q

Successional dental lamina can be found beginning at which stage of tooth development?

A

Cap stage

30
Q

What components can be found during cap stage?

A

Enamel organ, Dental Papilla, Dental follicle, cervical loops

31
Q

Enamel of tooth is derived from:

A

Enamel organ

32
Q

Dental papilla forms:

A

dentin and pulp

33
Q

Dental follicle forms:

A

cementum, periodontal ligament, part of alveolus

34
Q

What cells sit on top of dental papilla

A

Inner enamel epithelium

35
Q

Cells on periphery of ectomesenchyme =

A

outer enamel epithelium

36
Q

Cervical loops

A

Where inner and outer enamel epithelium meet (where HERS roots come from)

37
Q

Where is stratum intermedium found

A

Along the inner enamel epithelium

38
Q

Enamel organ is filled with what cells

A

Stellate reticulum

39
Q

What do stratum intermedium do

A

Regulating transport of ions to ameloblasts so they can secrete the enamel

40
Q

Main change that occurs during Bell stage

A

Change in shape of crown; completed differentiation of the enamel organ

41
Q

Dense condensation inside enamel organ:

A

Enamel knot

42
Q

When does dental lamina begin to degenerate?

A

Autolysis after enamel organ is differentiated

43
Q

Bell stage is marked by:

A

histodifferentiation and morphodifferentiation

44
Q

Basement membrane becomes:

A

DEJ

45
Q

___ is a potential space

A

DEJ (caries can spread out here)

46
Q

If dental lamina cells persist, what happens?

A

General cell islands may persist, may form small eruption cysts that delay eruption of the tooth

47
Q

Internal dental epithelium folds, making it possible to:

A

Recognize shape of future crown pattern

48
Q

Enamel knot is often continuous with:

A

Enamel cord or septum

49
Q

What does enamel knot represent

A

Organizational center that orchestrates cuspal morphogenesis

50
Q

As calcification occurs, the dental papilla becomes:

A

Dental pulp

51
Q

Tooth bone socket develops around tooth via:

A

Intramembranous bone formation

52
Q

Presence of _____ induces lining up and differentiation of ectomesenchyme along the basement membrane and become odontoblasts

A

Inner enamel epithelium

53
Q

Formation of dentin marks the onset of:

A

Crown stage

54
Q

Mineralization of dentin induces differentiation of internal dental epithelium into:

A

Ameloblasts (secrete enamel)

55
Q

Mineralization begins at _____ and proceeds ____

A

incisal/cuspal tip; coronally (toward cervix)

56
Q

True or false: odontoblasts secrete mineralized dentin

A

False - they secrete the organic matrix which mineralizes as an extracellular event

57
Q

Root formation happens from what part of tooth germ?

A

Cervical loops

58
Q

WHat happens during root formation?

A

Epithelial cells proliferate from cervical loop of enamel organ to form a double layer of cells (HERS)

59
Q

HERS extends around:

A

Dental pulp/between it and dental follicle

60
Q

True or false: HERS completely surrounds dental pulp

A

False - all but basal portion of pulp –> primary apical foramen

61
Q

When root sheath is enclosing more of expanding dental pulp, what happens to the ectomesenchymal cells facing the pulp?

A

Induces them to differentiatiate into odontoblasts and produce dentin of the root

DEN 7111 Development (19 decks)

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