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NBDE 1 Dental anatomy > Oral Histo > Flashcards

Oral Histo Flashcards

1
Q

type of keratinization where stratum corneum retains the nucleus

A

parakeritinized

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2
Q

The neonatal line is located in

A

enamel and dentin

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3
Q

Hypomineralized ribbon like structures that run longitudinally to DEJ

A

Enamel tufts

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4
Q

Odontoblasts that extend into enamel

A

enamel spindles

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5
Q

hypomineralized enamel that contains proteins, proteoglycans, or lipids

A

enamel lamellae

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6
Q

Individual enamel rods extending in variable directions at the cusp tips

A

gnarled enamel

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7
Q

Enamel starts out at _______ percent mineralized and procedes to _______ percent.

A

30%

96%

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8
Q

Mineralization of enamel forms _______ crystals

A

hydroxyapatite

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9
Q

The de-differentiated ameloblasts, remnants of stratum intermedium, outer enamel epithelium, and stellae reticulum form the

A

reduced enamel epithelium(Nasmyth’s membrane)

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10
Q

Enamel hypoplasia

A

due to decreased in the amount of matrix

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11
Q

Dentinogenesis vs amelogenesis

Which has a set end point

A

Amelogenesis ends and remains static.

Dentinogenesis is lifelong

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12
Q

Dentinogenesis imperfecta
Type 1:
Type 2:
Type 3:

A

Teeth have enamel fracture away soon after eruption leaving brownish cast that is soft and unprotected.

Type1: Associated with osteogenesis imperfecta
Type2: Standard, doesn’t occur with other disease
Type 3: Rare inherited disorder.

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13
Q

The layer of dentin closest to the DEJ is _______ dentin. The remaining layer of primary dentin is called_______

A

mantle dentin

curcumpulpal dentin

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14
Q

Lines of Von Ebner are caused by

A

the change in direction of collagen fibers orientation every 5 days

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15
Q

Neonatal line in enamel is called

in dentin:

A

Enamel: line of retzius
dentin: Lines of owen

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16
Q

Difference between first, second, and third dentin

A

First and second are the same, but second is made later.

Tertiary is reactive dentin

17
Q

Reactive vs reparative dentin

A

Reactive is made by old odontoblasts(tertiary)

Reparative is made from new mesenchymal cells that differentiated into odontoblasts

18
Q

The downward growth of the _______ determines root number and form

A

epithelial root sheath

19
Q

Intertubular dentin
Intratubular dentin
Globular dentin

A

IntErtubular: Normal mineralized dentin
IntrAtubular: Highly mineralized, no type 1 collagen
Globular: Hypomineralized dentin

20
Q

Dentin and dental pulp are both derived from _______ _______ cells

A

neural crest cells

21
Q

Describe the layers of pulp

A

Odontogenic zone has dentin forming odontoblasts
Cell free zone of Weil- Contains bundles of fibers, capilaries and nerves,
Cell rich zone- contains fibroblasts, Undifferentiated mesenchymal cells, and immune cells.
Deep Pulp- Plexus of rashcow(pain)

22
Q

What is a false pulp stone

A

irregularly calcified tissue in the pulp as opposed to true which are tubular dentin.

23
Q

percentage cementum is calcified

A

50-65%

24
Q

Cementum is formed from the

A

dental follicle

25
Q

Primary cementum

A

acellular and connects to dentin

26
Q

secondary dentin is

A

cellular and acellular and connects the dentin to fibers

27
Q

Major cell type of PDL

A

fibroblast

28
Q

Type of collagen in PDL

A

type 1

29
Q

Collagen fibers that insert in to the cementum or bone are called

A

Sharpeys fibers

30
Q

Where does the PDL insert?

A

bundle bone

31
Q

cribiform plate of alveolar bone fxn

A

blood vessels and nerves into ligament space

32
Q

Demilunes

A

serous portion of mixed secretory acini.

The acini secretes mucous and the demilune secretes erious

33
Q

Which type of acini(mucous or serous) have large amounts of rER, golgis, and secrete zymogens

A

Serous acini

34
Q

Intercalated ducts between secretory acini secrete _______ and absorb _______

A

secrete bicarbonate

absorb chloride ions

35
Q

Striated ducts between secretory acini reabsorb _______ and secrete _______

A

reabsorb sodium

secrete potassium

36
Q

Salivary gland is totally serious

A

Parotid

37
Q

Salivary gland is mixed but mostly serous

A

submandibular

38
Q

salivary gland is mixed but mostly mucous

A

sublingual

NBDE 1 Dental anatomy (9 decks)

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