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NBDE Part 1 > Tooth Formation/Development > Flashcards

Tooth Formation/Development Flashcards

1
Q

T/F: The dental lamina comes from mesenchyme.

A

False

Ectoderm

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2
Q

What determines the type of tooth to be formed?

A

Ectomesenchyme underlying the dental lamina

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3
Q

What three things form the tooth germ?

A

Enamel organ, dental papilla, dental follicle

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4
Q

What is the role of the enamel organ?

A

Forms enamel, initiates dentin formation

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5
Q

T/F: Ameloblasts differentiate before odontoblasts.

A

True

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6
Q

T/F: Enamel is formed before the formation of dentin begins.

A

False

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7
Q

How much root is formed when the tooth begins to erupt?

A

50%

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8
Q

What is the primary function of the dental pulp?

A

Form dentin

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9
Q

T/F: Dentin is harder than cementum.

A

True

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10
Q

What characterizes parakeratinized tissue?

A

Nuclei in the stratum corneum

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11
Q

T/F: Masticatory mucosa has a thin submucosa.

A

True

Not very movable

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12
Q

T/F: The neonatal line is only found in enamel.

A

False

Both dentin (lines of Owen) and enamel (stria of Rhetzias)

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13
Q

T/F: Stria of rhetzias and perikymata are normal structures.

A

True

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14
Q

Enamel _______ are ribbon like and extend roughly 1/3rd into enamel.

A

tufts

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15
Q

Enamel _______ are formed from the odontoblastic processes.

A

spindles

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16
Q

_________ is at the cusp tips and incisal edges.

A

Gnarled enamel

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17
Q

At the time of secretion, what is the level of mineralization of dentin and enamel?

A

Dentin = none

Enamel = 30% mineralized

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18
Q

Where does enamel secretion start?

A

Cusp tips/incisal edges

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19
Q

What cells form the reduced enamel epithelium?

A

Ameloblasts after enamel secretion

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20
Q

What characterized enamel hypoplasia?

A

Not enough enamel matrix

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21
Q

T/F: The DEJ is a strong, scalloped border.

A

True

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22
Q

What is the major component of dentin matrix?

A

Type I Collagen

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23
Q

Which type of dentiogenesis imperfecta is associated with osteogenesis imperfecta?

A

Type 1

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24
Q

What are lines of von Ebner?

A

Normal lines with the alignment of collagenous fiber of dentin

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25
Q

Which lines in the dentin lead to the neonatal line?

A

Lines of Owen

26
Q

T/F: Secondary dentin is laid down very quickly in response to carries.

A

False

Secondary is slowly deposited throughout life (why the pulp gets smaller)

27
Q

T/F: Secondary dentin has the same structure as primary dentin.

A

True

28
Q

T/F: Tertiary dentin requires a stimuli.

A

True

Carries, trauma

29
Q

What is the difference between repairative and reactive dentin?

A

Both tertiary

Repairative: laid down by newly differentiated mesenchymal cell
Reactive: laid down by already differentiated odontoblast

30
Q

T/F: Sclerotic dentin describes empty dentin tubules.

A

False

Dead tracks = empty tubules

Sclerotic dentin = excessive dentin laid down over time

31
Q

T/F: The epithelial root sheath forms the roots of the tooth.

A

True

32
Q

What is the approximated density of tubules?

A

20,000-30,000 per millimeter

33
Q

T/F: Peritubular dentin is hyper-mineralized dentin directly surrounding tubules.

A

True

34
Q

________ is hypomineralized and makes up the bulk of the dentin.

A

Intertubular dentin

35
Q

T/F: Dentin and pulp are both from the neural crest cells.

A

True

36
Q

Describe the layers at the pulp-dentin junction.

A

Odontoblastic zone, cell free zone of Weil, cell rich zone (mesenchymal cells), deep pulp

37
Q

What is found in the deep pulp?

A

Plexus of rashkow

38
Q

T/F: There is sympathetic nervous supply to capillaries in the pulp and tubules from the Trigeminal nerve.

A

True

39
Q

T/F: The number of cells in the pulp increases over time.

A

False

More type 1 and 3 collagen; less cells

40
Q

What is the difference between a true pulp stone and false pulp stone?

A

True: has tubular dentin

False: irregular calcified tissue

41
Q

What is primary cementum?

A

Completely acellular and connects to dentin

42
Q

What is secondary cementum?

A

Acellular and cellular (lower 3rd of tooth); connects to PDL

43
Q

What is the major cell type of the PDL?

A

Fibroblasts

44
Q

Which part of the alveolar bone is attached to the PDL?

A

Bundle bone

45
Q

What is the function of the cribriform plate?

A

Allows nutrients to get to the PDL

46
Q

T/F: Epithelium in the sulcus is keratinized.

A

False

47
Q

T/F: The junctional epithelium has only a single layer of squamous epithelium.

A

True

48
Q

Where is sulcular fluid produced?

A

Connective tissue in gingiva

49
Q

What structure splits the tongue into anterior 2/3rds and posterior 1/3?

A

Sulcus terminalis

50
Q

Which papilla of the tongue are most numerous and have no taste buds?

A

Filiform

51
Q

Which tongue papillae have taste buds and small salivary glands (of von Ebner)?

A

Circumvallate papillae

Found along sulcus terminalis

52
Q

Which papillae are found on the lateral parts of the tongue?

A

Foliate - have taste buds

53
Q

Which cells in taste buds are the chemoreceptors and have a nucleus found in the middle of the bud?

A

Gustatory cells

54
Q

What will be distinct about cells in serous acini?

A

Lots of organelles

55
Q

Which type of acini have zymogen granules?

A

Serous acini

56
Q

Serous deminlumes will be seen in which type of acini?

A

Mixed (submandibular)

57
Q

Striated ducts are found in which glands?

A

Serous gland - saliva is modified as it exits the duct

58
Q

T/F: Saliva in a mucous gland is modified as it goes through the duct.

A

False

59
Q

What is done by the intercalated ducts?

A

Secrete bicarbonate (HCO3-), reabsorb Cl-

60
Q

What types of glands are the salivary glands?

A

Parotid - serous
Sublingual - mixed (mucous)
Submandibular - mixed (mostly serous)
Von Ebners - serous

61
Q

What is done by the striated ducts?

A

Secrete K+, reabsorb Na+

62
Q

The major salivary glands contain which type of secretory unit?

A

Tubuloacinar

NBDE Part 1 (31 decks)

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