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NBDE Part 1 > Tooth Formation/Development > Flashcards

Tooth Formation/Development Flashcards

(62 cards)

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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
Which lines in the dentin lead to the neonatal line?
Lines of Owen
26
T/F: Secondary dentin is laid down very quickly in response to carries.
False Secondary is slowly deposited throughout life (why the pulp gets smaller)
27
T/F: Secondary dentin has the same structure as primary dentin.
True
28
T/F: Tertiary dentin requires a stimuli.
True Carries, trauma
29
What is the difference between repairative and reactive dentin?
Both tertiary Repairative: laid down by newly differentiated mesenchymal cell Reactive: laid down by already differentiated odontoblast
30
T/F: Sclerotic dentin describes empty dentin tubules.
False Dead tracks = empty tubules Sclerotic dentin = excessive dentin laid down over time
31
T/F: The epithelial root sheath forms the roots of the tooth.
True
32
What is the approximated density of tubules?
20,000-30,000 per millimeter
33
T/F: Peritubular dentin is hyper-mineralized dentin directly surrounding tubules.
True
34
________ is hypomineralized and makes up the bulk of the dentin.
Intertubular dentin
35
T/F: Dentin and pulp are both from the neural crest cells.
True
36
Describe the layers at the pulp-dentin junction.
Odontoblastic zone, cell free zone of Weil, cell rich zone (mesenchymal cells), deep pulp
37
What is found in the deep pulp?
Plexus of rashkow
38
T/F: There is sympathetic nervous supply to capillaries in the pulp and tubules from the Trigeminal nerve.
True
39
T/F: The number of cells in the pulp increases over time.
False More type 1 and 3 collagen; less cells
40
What is the difference between a true pulp stone and false pulp stone?
True: has tubular dentin False: irregular calcified tissue
41
What is primary cementum?
Completely acellular and connects to dentin
42
What is secondary cementum?
Acellular and cellular (lower 3rd of tooth); connects to PDL
43
What is the major cell type of the PDL?
Fibroblasts
44
Which part of the alveolar bone is attached to the PDL?
Bundle bone
45
What is the function of the cribriform plate?
Allows nutrients to get to the PDL
46
T/F: Epithelium in the sulcus is keratinized.
False
47
T/F: The junctional epithelium has only a single layer of squamous epithelium.
True
48
Where is sulcular fluid produced?
Connective tissue in gingiva
49
What structure splits the tongue into anterior 2/3rds and posterior 1/3?
Sulcus terminalis
50
Which papilla of the tongue are most numerous and have no taste buds?
Filiform
51
Which tongue papillae have taste buds and small salivary glands (of von Ebner)?
Circumvallate papillae Found along sulcus terminalis
52
Which papillae are found on the lateral parts of the tongue?
Foliate - have taste buds
53
Which cells in taste buds are the chemoreceptors and have a nucleus found in the middle of the bud?
Gustatory cells
54
What will be distinct about cells in serous acini?
Lots of organelles
55
Which type of acini have zymogen granules?
Serous acini
56
Serous deminlumes will be seen in which type of acini?
Mixed (submandibular)
57
Striated ducts are found in which glands?
Serous gland - saliva is modified as it exits the duct
58
T/F: Saliva in a mucous gland is modified as it goes through the duct.
False
59
What is done by the intercalated ducts?
Secrete bicarbonate (HCO3-), reabsorb Cl-
60
What types of glands are the salivary glands?
Parotid - serous Sublingual - mixed (mucous) Submandibular - mixed (mostly serous) Von Ebners - serous
61
What is done by the striated ducts?
Secrete K+, reabsorb Na+
62
The major salivary glands contain which type of secretory unit?
Tubuloacinar

NBDE Part 1 (31 decks)

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