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summer > embryo final > Flashcards

embryo final Flashcards

1
Q

The central pulp:

A

makes up the majority of the pulp.

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2
Q

Odontoblasts responsible for the production of reparative dentin are derived from:

A

mesenchymal cells of the cell rich zone.

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3
Q

True denticles:

A

are most commonly at the furcation of multirooted teeth.

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4
Q

Pulp horns:

A

are part of the coronal pulp.

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5
Q

Fine fibers of the dental pulp:

A

are found in the central pulp.
stain with silver.
are similar to beta fibrils of dentin.
are found in the peripheral pulp.

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6
Q

Odontoblasts:

A

can be found in the canal of the apical foramen.

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7
Q

Most of the sensory nerve endings in the pulp are located in the

A

dentinal tubules.

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8
Q

The cell free zone of Weil is located between the:

A

odontoblasts and the cell rich zone.

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9
Q

The blood vessels of the pulp:

A

can enter ‘through accessory root canals.

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10
Q

The canal of the apical foramen:

A

may be lined by cementum.

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11
Q

In the gingiva, orthokeratinized stratified squamous epitheli­um is normally found:

A

in the depressions between gingival stipples.
at the free gingival margin.
at the free gingival groove.

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12
Q

The free gingival groove:

A

forms functionally, with age.

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13
Q

The interdental groove is part of the:

A

attached gingiva.

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14
Q

The col is:covered with fully keratinized epithelium.

A

covered with fully keratinized epithelium.

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15
Q

The principal fibers of the gingival ligament which attach the tooth to the outer surface of the alveolar bone are the:

A

dentoperiosteal fibers.

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16
Q

The lamina propria of the gingiva has all of the following except :

A

mature elastic fibers.

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17
Q

The lamina propria of the gingiva has all of the following

A

capillaries.
large collagen bundles.
long connective tissue papillae.
lymphocytes and macrophages.

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18
Q

The cell in the epithelium of the gingiva responsible for recognizing foreign antigens is the:

A

Langerhans cell.

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19
Q

The dental cuticle:

A

cements the epithelium to the tooth.

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20
Q

During phase 2 of passive eruption,:

A

the junctional epithelium lies on both enamel and cementum.

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21
Q

The principal fiber group of the periodontal ligament which absorbs most of the force of mastication is the:

A

oblique fibers.

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22
Q

The larger blood vessels and nerves of the periodontal membrane are found:

A

in the interstitial rests.

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23
Q

The special fibers which anchor blood vessels in the periodon­tal membrane are the:

A

oxytalin fibers

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24
Q

Interradicular fibers prevent movement of the tooth in a direction that is:

A

apical.

lateral.

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25
Q

The collagen fiber of the PDL that spans from inside the tooth to inside the bone is made by:

A

cementoblasts, osteoblasts and fibroblasts.

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26
Q

The alveolar bone proper is sometimes called a cribriform plate because it:

A

has many foramina.

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27
Q

part of the alveolar process that is composed of compact bone is the:

A

cortical bone.

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28
Q

Bundle bone:

A

actually attaches the PDL to the bone,

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29
Q

When a tooth is moved by orthodontic techniques, all of the following occur except:

A

the periodontal membrane remains wider.

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30
Q

a radiograph, the lamina dura:

A

shows the shape of the alveolus.
indicates the areas of the attachment of the tooth.
is the result of the presence of bundle bone.
is thicker than the actual alveolar bone proper.

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31
Q

Pre-eruptive movement of teeth will compensate for all of the following changes except:

A

growth of the root.

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32
Q

Clinical eruption of a primary tooth is the point at which the:

A

tooth becomes visible in the oral cavity.

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33
Q

During the shedding process, an odontoclast may resorb any of the following tissues except:

A

alveolar bone.

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34
Q

Select the incorrect statement concerning the shedding of a primary molar.

A

tooth is usually shed before all of the root is resorbed.

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35
Q

The TMJ is a joint which involves all of the following except

A

frontal bone

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36
Q

As a result of the translatory movement in the TMJ, the

A

condyle slides along the temporal bone

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37
Q

The articular disk:

A

is made of collagen fibers

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38
Q

The none of the above synovial fluid in the TMJ:

A

provides nutrients for the articular disk

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39
Q

All of the following might indicate the possibility of a TMJ problem except :

A

feelings of hunger

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40
Q

In order to have a healthy and properly balanced TMJ, which of the following conditions must be satisfied?

A

teeth in proper occlusion
absence of muscle spasms
tendons and ligaments in good working order

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41
Q

Fordyce’s spots:

A

may be found in the upper lip

42
Q

A whitish thickened ridge in the buccal mucosa

A

linea alba

43
Q

Which part of the oral cavity has the thickest

layer?

A

gingiva

44
Q

All of the following are found associated with of the oral cavity except :

A

hard palate

45
Q

Deglutition is involved with:

A

food movement

46
Q

Amalgam tattoo is associated with:

A

the gingiva

47
Q

Tall, narrow connective tissue papillae are associated with:

A

the hard palate

48
Q

Xerostomia is associated with:

A

salivary glands

49
Q

The only keratinized papillae are the

A

filiform papilla

50
Q

Salivary corpuscles in saliva represent:

A

degenerating white blood cells

51
Q

All of the following are major salivary glands except :

A

buccal

52
Q

The best known bacteria-fighting protein(s) is(are):

A

lysozyme

53
Q

cause bacteria-to clump together.

A

mucus

.immunoglobulins

54
Q

The human, adult parotid gland:

A

has a well formed connective tissue capsule

55
Q

Myoepithelial cells:

A

stimulate cells to secrete

56
Q

The main excretory duct of the parotid:

A

none of the above

57
Q

Select the statement that best describes the sublingual gland.

A

has mucous alveoli

58
Q

The buccopharyngeal membrane ruptures during the week of development.

A

tenth

59
Q

The dental lamina will grow into the underlying connecting tissue in how many locations in the upper jaw?

A

10

60
Q

The cap stage of a developing tooth will have all of the following following layers present except :

A

stratum intermedium

61
Q

The dental sac will give rise to:

A

Cementoblasts

62
Q

The stratum intermedium:

A

contributes enzymes to enamel formation

63
Q

The vestibule develops from the:

A

oral epithelium

64
Q

During dentin and enamel formation:

A

the root begins to form

65
Q

Predentin:

A

is unmineralized matrix

66
Q

According to the Keyhole Hypothesis, an enamel rod is formed from ameloblasts.

A

4

67
Q

In the ameloblast, a reversal of polarity means that:

A

organelles move to a different part of the cell

68
Q

Fluoride is an effective protective agent for the tooth because:

A

enamel is permeable

69
Q

The hardness of enamel is related to:

A

hydroxyapatite crystals

70
Q

The etching of enamel:

A

is used in bonding techniques

71
Q

Enamel rods:

A

extend from the DEJ to the free surface of the enamel

72
Q

Lines of Retzius:

A

are hypermineralized

73
Q

Enamel lamellae:

A

may look like cracks

can be found extending into dentin

74
Q

Enamel is yellow because:

A

of the presence of dentin

75
Q

Attrition refers to:

A

the absence of collagen in enamel

76
Q
  • may be found in enamel.
A

A. odontoblastic processes
B. tufts
C. lamellae
D. spindles

77
Q

In comparison to dentin, the hydroxyapatite crystals in

enamel:

A

are larger

78
Q

The bulk of a mature tooth is:

A

dentin

79
Q

Hypomineralization is also known as:

A

hypocalcification

80
Q

Mantle coars

A

has Korff’s fibers

81
Q

Dentin is considered to be a living tissue because:

A

of the presence of odontoblastic processes

82
Q

Hydroxyapatite crystals are composed of:

A

calcium

83
Q

Areas of hypominerization normally found in primary dentin is known as dentin.

A

interglobular

84
Q

Dentinal tubules:

A
  1. are all “S”shaped
85
Q

________ dentin forms in the. roots of teeth of older people as a protective mechanism.

A

transparent

86
Q

All of the following statements describe Tome’s Granular Layer
except:

A

found in the crown

87
Q

Secondary regular dentin:

A

narrows (make smaller) the size of the pulp chamber

88
Q

Reparative dentin:

A

protects the pulp

89
Q
  1. Hertwigs epithelial root sheath is formed from the:
A

inner enamel epithelium and outer enamel epithelium.

90
Q

Root formation begins:

A

when dentin and enamel formation reach the cervical loop.

91
Q

Epithelial rests of Malassez:

A

are remnants of the epithelial root sheath.

92
Q

The epithelial diaphragm: :

A

determines the size of the apical foramen.

93
Q

Cementoblasts are derived from the:

A

mesenchyme of the dental sac.

94
Q

Acellular cementum:

A

is laid down in layers (lamellae).

95
Q

Mature cementum:

A

is softer than dentin.

96
Q

Most of the collagen in cementum is:

A

in the form of Sharpey’s fibers.

97
Q

The most common type of cemento-enamel junction is one in which:

A

cementum overlaps enamel.

98
Q

Cementum is held to dentin at the CDJ by:

A

intertwined collagen fibers.

99
Q

In cellular cementum, lacunae:

A

have many canaliculi.

100
Q

All of the follow statements about cementum are true except:

A

more resistant to bacteria than enamel.

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