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NBDE Part 1 > Oral Histology > Flashcards

Oral Histology Flashcards

(81 cards)

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1
Q

What are the oral mucosa layers from outer to inner?

A

Cali Girls String Bikinis

Corneum, Granulosum, Spinosum, Basale

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2
Q

Langerhans cells often extend into which layer of oral mucosa?

A

Spinosum

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3
Q

The basement membrane of oral mucosa contains _____ collagen and _________.

A

type IV; laminin

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4
Q

T/F: All oral mucosa contains stratified squamous epithelium.

A

True

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5
Q

T/F: Gingiva contains keratinized tissue.

A

True

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6
Q

The ______ separates the attached and unattached gingiva.

A

free gingival groove

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7
Q

The intersection of epithelial rete pegs causes visible ________ in some patients.

A

stippling

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8
Q

Which parts of the mouth have keratinized tissue?

A

Gingiva, hard palate, lips

some on dorsal tongue

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9
Q

T/F: The dentogingival junction is an attachment of epithelium only.

A

False

Epithelium and connective tissue

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10
Q

T/F: Sulcular epithelium is keratinized.

A

False

Sulcular and junctional epithelium are not keratinized

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11
Q

Which type of collagen makes up the majority of dentogingival connective tissue?

A

Type 1 collagen

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12
Q

_________ fan laterally from cementum into the adjacent CT.

A

Dentogingival fibers

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13
Q

___________ fan coronally from the alveolar crest into the adjacent CT.

A

Alveologingival

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14
Q

__________ extend from cementum over the alveolar crest, and turn apically to insert into the periosteum of the buccal side of alveolar bone.

A

Dentoperiosteal fibers

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15
Q

___________ surround the tooth in a circular fashion.

A

Circumferential

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16
Q

T/F: Cementum has more mineral composition than dentin.

A

False

Dentin = 70% mineralized
Cementum = 55% mineralized
Bone = 50% mineralized
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17
Q

Which is the only component of the tooth that comes from ectoderm?

A

Enamel

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18
Q

The dental papilla forms what parts of the tooth?

A

Pulp and dentin

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19
Q

The dental follicle forms which parts of the tooth?

A

Cementum, alveolar bone, PDL

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20
Q

The __________ is the dentin layer found closest to the DEJ.

A

mantle dentin

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21
Q

The mantle dentin contains which type of collagen?

A

Type 1 (large-diameter)

*Predentin

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22
Q

What is sclerotic dentin?

A

Several dentinal tubules become occluded with peritubular dentin

Happens over time and reduces pulpal sensitivity

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23
Q

T/F: Dentin tubules are straight all the way through the dentin.

A

False

Most coronal portion follows as S-shape (primary curvature)

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24
Q

T/F: There are more dentin tubules concentrated at the pulp than the DEJ.

A

True

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25
Reparative dentin contains which type of collagen?
Type I and III
26
_________ is all of the dentin formed from the mantle dentin to the pulp.
Circumpulpal | encircles the pulp
27
What are the classifications of primary, secondary, and tertiary dentin?
Primary - formed prior to root completion Secondary - formed after root completion Tertiary - reparative
28
________ dentin is hypomineralized and makes up the majority of the dentin in the tooth.
intertubular
29
T/F: Interglobular dentin is hypermineralized.
False Hypomineralized
30
What three things will increase with aging on dentin?
Sclerotic dentin, reparative dentin, dead tracts
31
T/F: Dentinogenesis imperfecta and dentin dysplasia are inherited as autosomal dominant defects.
True
32
In a patient with __________ the root dentin is affected the most causing roots to be short, blunt, or absent.
dentin dysplasia
33
__________ constitutes about 90% of enamel matrix protein secreted.
Amelogenin
34
T/F: Ameloblasts become elongated and the organelles become polarized before the same happens to odontoblasts.
True
35
T/F: The oldest enamel will be found at the DEJ.
True Under cusp or cingulum
36
When does ameloblastic activity start?
Immediately after mantle dentin formation
37
What are formed around enamel matrix proteins as the ameloblasts retreat?
Tomes' processes
38
Each enamel rod is formed by how many ameloblasts?
4
39
What is gnarled enamel?
Enamel rods appear twisted at cusp tips
40
What forms after enamel maturation to protect the enamel until eruption?
Reduced enamel epithelium (Nasmyth's membrane)
41
How fast is enamel matrix produced?
4 micrometers/day
42
Perikymata are formed on the enamel surface where ___________ reach the surface.
striae of retzius
43
________ are alternating light and dark lines that is only an optical phenomena.
Hunter-Schreger bands
44
T/F: Enamel tufts will extend from the DEJ to the enamel surface.
False Tufts go slightly into enamel Lamellae can go all the way to the surface
45
________ are trapped odontoblastic processes in the enamel.
Enamel spindles
46
T/F: Hypoplastic enamel will have abnormal thickness/pitting.
True Defect in matrix formation
47
T/F: Hypocalcified enamel has normal thickness, but is soft.
True Defect in mineralization
48
If concentrations of _________ are too high in enamel it will lead to enamel mottling and a brownish pigment.
fluoride
49
What are two enamel malformations in patients with congenital syphilis?
Hutchinson incisors and mulberry molars
50
What is the Hutchinson's triad of congenital syphilis?
1. Blindness 2. Deafness 3. Dental anomalies
51
What is the outer most layer of the pulp?
Odontoblastic zone - single layer of odontoblasts
52
What zone of the pulp is between the Odontoblastic zone and the cell-rich zone?
Cell-free zone of Weil - contains nerves and blood vessels
53
The cell-rich zone of the pulp contains _______.
fibroblasts
54
T/F: Elastic fibers are prevalent in the pulp core.
False Collagen I and III
55
What is the difference between a true and false denticle (pulp stone)?
True - surround dentin tubule or odontoblastic process False - surround dead cells or collagen
56
What are the two major effects of aging on the pulp?
1. increase in collagen and calcification | 2. decrease in size
57
T/F: Cementum is avascular.
True
58
________ provide attachment for teeth.
Sharpey's fibers
59
During root formation, ectomesenchyme cells from the dental follicle migrate through gaps in ___________ and differentiate to _________.
Hertwig's epithelial sheath; cementoblasts
60
T/F: Cementum is constantly produced at the apical portion of the root.
True
61
T/F: Primary cementum can sometimes be vascular.
False Primary - coronal and always avascular Secondary - apical and can be either vascularized or avascularized
62
Where are you most likely to find acellular cementum?
Coronally
63
T/F: Extrinsic fibers are produced by cementum.
False Intrinsic - produced by cementum; parallel to tooth surface Extrinsic - produced by PDL; perpendicular to tooth surface
64
T/F: Extrinsic fibers are known as Sharpey's fibers as they get trapped in cementum.
True
65
T/F: In most patients the cementum overlaps with the enamel.
True
66
What is the alveolar bone proper?
Cortical bone immediately surrounding teeth with Sharpey's fibers (bundle bone, lamina dura, cribriform plate)
67
What is the difference between the cortical plates and cancellous bone of alveolar bone?
Cortical plates form the buccal and lingual outer surfaces Cancellous bone is the spongy (trabecular) bone that fills in
68
T/F: Cortical bone is thicker in the mandible and posterior regions.
True
69
Roughly how wide is the PDL?
0.2 mm
70
What are the three components of the periodontium?
Cementum, PDL, alveolar bone proper
71
T/F: The PDL is vascular.
True
72
What is the most common cell of the PDL?
Fibroblasts
73
T/F: The PDL has cells for both cementum and bone remodeling.
True
74
What are Epithelial rests of Malassez?
Remnants of HERS
75
What are the two types of collagen fibers in the that make up the principle collagen fibers of the PDL?
Type I and some type 3
76
What are the 6 principle PDL fibers?
1. Transseptal - tooth-tooth over AV crest 2. Alveolar crest - AV crest-tooth 3. Horizontal 4. Oblique 5. Apical 6. Interradicular - in furcations of multirooted teeth
77
Which principle fibers are the most abundant and resist the majority of masticatory forces?
Oblique fibers
78
What is the primary source of PDL vasculature?
Periosteal vessels
79
PDLs of almost all teeth drain lymphatics to the submandibular nodes. Which are the exception?
Mandibular incisors - submental nodes
80
T/F: PDL will thicken with age.
False Gets thinner
81
T/F: Teeth in hyperfunction will have an increased PDL width.
True

NBDE Part 1 (31 decks)

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