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Histology > Teeth > Flashcards

Teeth Flashcards

1
Q

Teeth are grossly divided into

A

root and crown

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2
Q

Portion of tooth embedded in bone called

A

tooth root

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3
Q

tooth root is in part of jaw called

A

alveolar ridge

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4
Q

Tooth socket is called

A

alveolus

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5
Q

Crown is protected by a layer of

A

highly mineralized Enamel

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6
Q

Enamel is hard, translucent substance containing

A

1% organic material, 96-98% hydroxyapatite

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7
Q

enamel is secreted by tall, columnar

A

ameloblasts of enamel organ

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8
Q

Ameloblasts degenerate when…

A

the tooth erupts

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9
Q

Apical, secretory end of ameloblasts forms single, large processes called

A

tome’s process

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10
Q

Tome’s Processes have _____ & ______ inside

A

microtubules and secretory vesicles

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11
Q

Enamel mineralization is non-uniform, resulting in highly calcified ___________ or _______ which are roughly hexagonal

A

enamel rods, prisms

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12
Q

what separates enamel rods

A

less mineralized interprismatic material

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13
Q

Enamel rods extend from

A

ameloblast at enamel surface to dentino-enamel junction

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14
Q

Bulk of tooth composed of less mineralized _________

A

dentin

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15
Q

Dentin secreted by ________________

A

odontoblasts of dental papilla as non-mineralized pre-dentine

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16
Q

Dentin in chemically similar to bone, but more

A

mineralized, 70-80% hydroxyapatite crystals

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17
Q

_________________(Ca and PO4) play a key role in mineralization of dentin matrix

A

Matrix vacuoles

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18
Q

Dentin also contains _________________ (two things)

A

Type 1 collagen, and GAGs

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19
Q

Dentin is arranged in ______

A

Dentin Tubules

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20
Q

Dentin tubules are ___________, __________ tubules radiating from _________

A

hollow, parallel, pulp cavity

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21
Q

Dentin Tubules contain long, rod like cytoplasmic processes of odontoblasts called

A

Tome’s Fibers

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22
Q

Pulp cavity contains

A

nerves and blood vessels

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23
Q

Dentin innervated by

A

Myelinated nerves

24
Q

Dental Pulp is ______________ in origin, resembles primitive __________

A

mesodermal, mesenchyme

25
Q

Dental pulp contains what?

A

Stellate Fibroblasts, Reticular Fibers, Collagen, and Ground Substance

26
Q

Pulp is richly supplied by capillaries from arterioles running with what structure?

A

Periodontal ligament

27
Q

Tooth root is covered by thin layer of ___-

A

cementum

28
Q

Cementum Characteristics

A

starts as acellular cementum (AC) amorphous, collagen-based, calcified tissue, 45-50% HA, manuactured by cementoblasts (mature into cementocytes) Now called Cellular cementum (CC)

29
Q

Cementocytes that lie against the surface of the PDL

A

produce new cementum by appositional growth

30
Q

cementocytes are similar to

A

osteocytes/blasts structurally and funtionally

31
Q

Gingiva

A

masticatory oral mucosa that protects neck of tooth

32
Q

Neck

A

region of tooth between root and crown

33
Q

Gums also cover

A

upper portion of alveolar ridge

34
Q

space between gingiva and crown

A

gingival sulcus or crevice

35
Q

gingival sulcus lined by

A

crevicular epithelium

36
Q

Crevicular Epithelium is

A

very thin, 2-3 cells thick, easily breached by bacteria +> periodontal disease, gingivitis

37
Q

Periodontium includes:

A

epithelium, cementum, PDL, alveolar bone

38
Q

Cemento-enamel junction

A

Where cementum meets enamel

39
Q

PDL or membrane is composed of dense collageous fibers called

A

Sharpey’s Fibers

40
Q

PDL anchors bone of alveolus to

A

cementum layer

41
Q

Sharpey’s Fibers run at oblique angle to

A

support tooth in socket but allow movement of tooth during chewing

42
Q

There are occasional clusters of epithelial cells withing PDL are -

A

vestigial epithelial rests (of Malassez)

43
Q

Tooth is formed between opposing layers of epithelium which are:

A

ameloblasts of enamel organ and odontoblasts of dental papilla

44
Q

Enamel

A

ectodermal origin

45
Q

Dentin, Cementum, pulp & PDL are

A

mesodermal origin

46
Q

Horse-shoe shaped ridge arises in oral epithelium at week _____ of fetal development

A

6, (cap stage)

47
Q

The dental lamina denotes the

A

position of future jaws

48
Q

In each quadrant the lamina develops several globular, ectodermal swellings for each —–

A

deciduous tooth

49
Q

Superficial half of ectodermal swellings form

A

enamel organs

50
Q

Deep half of ectodermal swellings form

A

dental papilla

51
Q

Odontogenesis - Early Bell Stage

A

Cells of epithelial tooth bud develop into the enamel origin
become a bell shaped structure with a core of loosely arranged stellate cells and peripheral layer of cuboidal/low columnar epithelium (external and internal epithelium) that meet at cervical loop

52
Q

Internal enamel epithelium differentiates into

A

layer of ameloblasts and 2-3 cell thick stratum intermedium

53
Q

Mesenchyme condense to form

A

dental papillae, a row of odontoblasts develop between papilla and ameloblasts

54
Q

Permanent tooth arises from side growth of

A

pf dental lamina

55
Q

Slide 16

A

Finish with recording

Histology (8 decks)

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