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HISTOLOGY > Alveolar bone > Flashcards

Alveolar bone Flashcards

1
Q

What are the layers of a tooth?

A

Enamel >PDL>Cementum> dentine > Pulp

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2
Q

What is the alveolar bone?

A

forms socket wall consists of inner cortical plate of alveolar process

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3
Q

What is the major protein matrix of the bone?

A

Collagen

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4
Q

What are the 4 Connective tissues in periodontium?

A

Cementum
Alveolar bone
Periodontal ligaments
Lamina propria

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5
Q

Which connective tissues are calcified?

A

cementum

alveolar bone

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6
Q

which connective tissues are non calcified?

A

periodontal ligaments

lamina propria

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7
Q

What is bone made of ?

A 
65% = inorganic HAP
23%= organic e.g. Collagen type 1, calcified tissues
12%= water
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8
Q

is the mandible bone chem/structurally same as ant other bone in body?

A

YES

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9
Q

What are the bone structures?

A

COMPACT/CORITCAL

CANCELLOUS

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10
Q

What is cancellous bone?

A

spongy bone- forms core of bone

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11
Q

what are the types of compact bone?

A

Parallel plates

Haversian system

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12
Q

What are lamellae ?

A

parallel plates of bone on perio/endosteal surface

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13
Q

What is Haversian system?

A

when lamellae form concentric circles

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14
Q

how is mature haversian bone formed?

A

lamellae remodel and removed and form around central canal

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15
Q

what happens when haversian bone is laid down?

A

vascular canal smaller and mineral more dense

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16
Q

What is above/below “line” that’s level to root apices?

A

alveolar process and body of mandible below

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17
Q

what is the bone arrangement in mandible body?

A

compact bone outside and cancellous interior

18
Q

what is bone arrangement of alveolar process for incisor?

A

little cancellous bone and process formed from fusion of interior and exterior cortical plates

19
Q

what is bone arrangement of alveolar process for back tooth?

A

cancellous present in alv. process

20
Q

what does the inner cortical plate form?

A

socket wall>cancellous bone> outer cortical plate

21
Q

what is attached to alveolar bone?

A

periodontal ligament

22
Q

what penetrates alveolar bone from demineralized periondontal ligaments?

A

Sharpeys fibres

23
Q

what between sharpeys fibres?

A

Osteoblasts

24
Q

what are osteoblasts

A

form new bone matrix

25
Q

what is osteoid?

A

unmineralized pre bone at PDL and Bone junction

26
Q

what is immature bone with sharpeys ?

A

Bundle bone

27
Q

what happens to sharpeys when bone matures

A

fibres are now TRANSALVEOLAR and insert into adjacent tooth root

28
Q

what happens when teeth are lost ?

A

alveolar bone is reabsorbed

29
Q

what happens to alveolar crest when teeth absent?

A

reduces due to plasticity

30
Q

how is bone reabsorbed ?

A

osteoclasts break down bone

31
Q

What do osteoblasts have

A

RER

32
Q

What are Osteocytes?

A

osteoblasts entombed in bone matrix

33
Q

what are canaliculi?

A

channels so osteocytes can contact others in PDL

34
Q

What are osteoclast?

A

bone degradation found in Howships lacuna

35
Q

what is howships lacuna?

A

depression in bone

36
Q

what is border of degrading bone with osteoclasts?

A

brush boarder since microvilli

37
Q

what do microvilli help for degrading bone?

A

Inc. SA for pumping H+ and enzymes into matrix

38
Q

what do protons do for degrading bone?

A

lower ph so dissolve mineral

39
Q

what do enzymes do for degrading bone?

A

matrix degraded after minerals gone

40
Q

what is the annular zone?

A

around brush boarder where degradation localized and low ph here

41
Q

what is resting line?

A

smooth line where previous bone depostion

42
Q

what is reversal line?

A

where resorption reversed to formation

-osteoclasts move away and osteoblasts enter so new bone laid down

HISTOLOGY (5 decks)

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