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Histology Lecture Test 3 > Teeth > Flashcards

Teeth Flashcards

1
Q

tooth root

in part of the jaw called the alveolar ridge

A

portion embeded in the bone

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2
Q

alveolar ridge

A

part of the jaw where the tooth root is located

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3
Q

Tooth socket

A

alveolus

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4
Q

crown of the tooth

A

projects into the oral cavity

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5
Q

Enamel

A
  • highly mineralized
  • covers crown
  • hard
  • translucent
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6
Q

Enamel contains

A

<1% organic
96-98% hydroxyapatite

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7
Q

What creates enamel?

A

ameloblasts

come from enamel organ

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8
Q

When do ameloblast degenerate?

A

after the tooth erupts

can’t replace enamel

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9
Q

Tome’s Process

A

apical end of ameloblast

microtuble and secretory vesicles

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10
Q

Enamel mineralization is _______________

A

non-uniform

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11
Q

What is the shape of enamel rods/ prisms?

A

hexagonal

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12
Q

interprismatic material

A
  • between the enamel rods
  • less mineralized
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13
Q

Enamel rods extend from ameloblasts at

A

enamel surface to dentio-enaml junction

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14
Q

What secretes pre-dentine?

A

odontoblast

of dental pailla

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15
Q

Dentin

A
  • bulk of the tooth
  • less mineralized
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16
Q

Dentin has_________ hydroxyapatite

A

70-80%

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17
Q

Dentine is chemically similar to

A

Bone

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18
Q

What plays a key role in the mineralization of Dentine matrix?

A

matrix vacuoles (Ca2+ and PO4-)

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19
Q

What are in matrix vaculoes?

A

Ca2+ and PO4-

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20
Q

Dental tubules

A
  • How dentine is arranged
  • parallel tubes radiating form the pulp cavity
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21
Q

Tome’s process

A

long rod like cytoplasmic process of odontoblasts

in dentine tubules

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22
Q

Dentine also contains

A
  • type 1 collagen
  • GAGs
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23
Q

Pulp cavity contains

A

senrory nerves and blood vessels

support structures

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24
Q

Dentine is innervated by

A

myelinated nerves

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25
Q

What is the origin of dental pulp

A

mesodermal

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26
Q

Dental pulp contains

A
  • stellate fibroblasts
  • reticular fibers
  • collagen
  • ground substance
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27
Q

Dental pulp is

A

richly supplied by capillaries and artioles

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28
Q

the capillaries and artioles that supply the dental pulp run with

A

the periodontal ligament

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29
Q

What covers the outer layer of the root?

A

thin layer of cementum

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30
Q

cementum

A

amorphous, collagen-based, calcified tissue

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31
Q

cementum is similar structural and functionally to what?

A

osteoblast

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32
Q

Cementum is ________ hyrdroxyapapitite

A

45-50%

similar to bone

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33
Q

What makes cementum?

A

cementoblasts

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34
Q

What do cementoblast mature into?

A

cementocytes

cellular cementum (CC)

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35
Q

What is the growth of cementum?

A

appostiional growth
* cementocytes lie against periodontal ligament and produce new

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36
Q

gingiva

A

covers the upper alveolar ridge

masticory oral mucosa

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37
Q

neck of tooth

A

region between the tooth root and crown

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38
Q

Attached Gingiva

A

covers upper alveolar bone

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39
Q

Free Gingiva

A
  • froms cuff
  • neck of the tooth
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40
Q

Gingival sulcus

crevice

A

Space between free gingiva and crown

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41
Q

Crevical Epithelium

A
  • very thin (2-3 cells)
  • easily breached by bacteria
42
Q

What is the tissue that surround and support the tooth?

A

Periodontium

43
Q

Periodontium includes

A
  • eputhelium
  • cementium
  • periodontal ligament
  • alveloar bone
44
Q

Sharpeys fibers run at

A

oblique angle

support tooth in socket

45
Q

What achors the the cementum to the bone?

A

Sharpey’s fibers

allows for slight movement

46
Q

Clusters of epitheila cells within the periodontal ligament

A

vestigial epithelial rests (of Malassez)

47
Q

Tooth is formed between

layer of epithelial cells

A
  • ameloblast of enamel organ
  • odontoblast of dental papilla
48
Q

What is the origin of enamel

A

ectodermal

49
Q

Within the tooth what is mesodermal derived?

A
  • dentin
  • cementum
  • pulp
  • periodontal ligament
50
Q

When is the teeth start to form in the fetus?

A

about week 6

51
Q

dental lamina

A

form the postion of the future jaw

52
Q

What are the stages of Odntogenesis?

A
  1. Cap
  2. early bell
  3. late bell
53
Q

the interal enamel epithelium differeniates into

A

a layer of ameloblasts

54
Q

Mesenchyme condense to form

A

dental paillae

55
Q

Permanent tooth arise from

A

side growth of pf dental lamina

56
Q

What portion of the developing ectodermal swelling forms the enamel organs?

A

superfical

57
Q

What portion of the developing ectodermal swelling forms the dental papilla?

A

the deep portion

58
Q

What is the central portion of the enamel organ called?

A

central stellate epithelium

59
Q

What is the outer layer of the enamel?

A

cubodial/columnar epithelium

60
Q

The internal enamel epithelium becomes the

A

ameloblasts

61
Q

Straum intermedium

A
  • 2-3 cells thick
  • associated with layer of ameloblasts
62
Q

What does the permanent tooth (bud) arise from?

A

side of the dental lamina

during the ealry bell stage

63
Q

enamel organ is intially

A

cup-shaped

64
Q

cells of the enaml organ progressively differentiate and become

A

stellate reticulum

65
Q

external enamel epithelium

A

cells lining outer surface of enamel organ

66
Q

internal enamel epithelium

A

cells linining the concave surface of enamel organ

67
Q

cells lining convex surface of dental papilla

A

develop into odontoblasts

68
Q

internal enamel epithelium differentiate into

A

ameloblasts

69
Q

Amelogenesis

A

enamel formation

by ameloblasts

70
Q

Dentinogenesis

A

dentin formation

by odontoblast

71
Q

What induces the differentiation of odontoblasts?

A

the devleopment of ameloblasts

72
Q

what iniates tooth formation?

A

depostion of organic pre-dentine by odontoblast

later calcified into dentine

73
Q

What triggers ameloblast to deposit enamel?

A

calcification of dentin matrix

secondarily induces enamel production by ameloblast

74
Q

odontoblast have

A

odontoblast processes

75
Q

odontoblast processes are

A

embed in the dentine matrix

76
Q

odontoblast processes form

A

dentine tubules

77
Q

what are enamel rods seperated by

A

interprismatic material

less mineralized

78
Q

At the time of eruption what degenerates?

A

enamel organ and ameloblasts

79
Q

________ shinks and become dental pulp

A

dental papilla

80
Q

Hertwig’s root sheath is located

A

at the cervical loop of the enamel organ

81
Q

Hertwig’s root sheath triggers

A

formation of dentin in the root

82
Q

How does Hertwig’s root sheath trigger formation of dentin in the roo

A

the differentiation of odontoblast from the dental papilla

83
Q

When Hertwig’s root sheath disintergrates some parts become

A

epitheial cell rests

84
Q

After the tooth formation is complete what is still produced

A

small amounts of 2’ dentin

85
Q

The outer rim of the enamel organ is known as

A

epitheial sheath of hertwig

86
Q

epitheial sheath of hertwig funciton

A

determines the cross-sectional outline of the tooth

87
Q

Dental Follicle becomes

A

ar large portion of the periodontal ligament

88
Q

What is something unique about the permanent molar?

A

the dental lamin proliferates on its own

89
Q

when do tooth development begin

A

6th week of fetal development

90
Q

What is the eruption time of the deiduous teeth?

A

6 - 30 months

91
Q

what is the formula for deciduous teeth

A

2I 1C 2M

92
Q

When do permanent teeth erupt?

A

6- 12 years of age

93
Q

Tertracycline giving during devleopment

A

can cause teeth to be yellow in color

94
Q

Human Dental Formula

A

I 2/2 C1/1 P2/2 M/3/3

95
Q

Orthiodontia works due to

A

osteoblast and osteoclast activity in the aveolus

96
Q

Dental Caries

A

acid erode and bacteria eat away

97
Q

Fluriode helps to

A

harden enamel and kill bacteria

98
Q

Periodontal Disease is caused by

A

accumulation of plaque in gingival sulcus

99
Q

gingivitis

A

inflamation of gums

100
Q

where does the tooth numbering start?

A

on the upper right

Histology Lecture Test 3 (10 decks)

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