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Oral Histology > periodontium II - alveolar process > Flashcards

periodontium II - alveolar process Flashcards

1
Q

3 steps of ortho

A
  1. Compression and Tension of the PDL
  2. Inflammation and lag period:
  3. Tooth movement phase: Bone resorption and Bone deposition
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2
Q

T/F: facial bones DO NOT follow growth of body

A

FALSE. they do!

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3
Q

when is the peak rate of facial skeleton growth

A

14-18

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4
Q

T/F

Mandible and maxilla grow simultaneously but stop differentially

A

true!

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5
Q

what are the 2 regions of the jaw bone

A

basal bone and alveolar process

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6
Q

body of the mandible or maxilla is called

A

basal bone

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7
Q

portion of jaw that contains the tooth:
o requires the presence of the tooth and masticatory force to maintain bone density, height, thickness
o Atrophy with loss of tooth

A

alveolar process

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8
Q

what are the 2 regions of the alveolar process

A

supportive region and alveolar bone proper (ABP)

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9
Q

what is found in the supportive region of the alveolar process

A

outer cortical plate and cancellous (central)

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10
Q

T/F: F is thinner than L

A

true!

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11
Q

where can we find the THICKEST cortical bone in jaw

A

POST and L on MAND

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12
Q

does max or mand have THINNER cortical bone

A

MAX has thinner!

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13
Q

what is the ABP

A

tooth socket that surrounds tooth

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14
Q

what is the ABP comprised of

A

compact bone

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15
Q

what is the ABP also called

A

lamina dura (radiograph); bundle bone, or cribriform

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16
Q

site of insertion for PDL via sharpeys

A

ABP

17
Q

what are the 3 regions of ABP

A
  1. Interdental septum – area between each tooth- forms mesial/distal wall of tooth socket
  2. Inter-radicular septum- tooth socket between roots
  3. Alveolar crest - cortical plate and alveolar socket meet
18
Q

what is lamellar bone

A

MATURE compact and spongey

19
Q

what is cribriform plate

A

term used to describe openings to allow passage of neurovascular structures into alveolar bone

20
Q

can alveolar bone repair and remodel

A

yes!

21
Q

what happens to the alveolar bone as we age

A

-Increase in resorption
* Increase in adipose in marrow cavity
* Thinning of alveolar bone
* Atrophy if loss of tooth occlusion or tooth

22
Q

when does jaw movements start and end

A

occurs during 14-18 yrs /stops when growth ceases 18-25yr

23
Q

histological features of post-eruptive jaw growth

A
  • increase in bone at alveolar crest
  • increase in root length by deposition of
    secondary cementum
  • Increase in bone density
24
Q

do movements to compensate for occlusal wear occur throughout life?

A

yes!

25
Q

Outcome of occlusal wear and histological features

A
  • Apical increase in secondary cementum deposition
  • PDL remodeling and functional adaptation of increased
    width
  • Increase in bone height at alveolar crest; change in
    bone density
26
Q

does bone have intrinsic AND extrinsic fibers?

A

yes!! collagen (intrinsic) and sharpeys (extrinsic)

27
Q

3 categories of post eruptive movements

A
  • accommodate jaw growth
  • accommodate occlusal wear (2º cementum deposition)
  • accommodate interproximal wear (mesial drift)
28
Q

what are the 2 axial movements post-erup

A

due to adolescent jaw growth
due to compensation of occlusal wear

29
Q

mesial drift is due to

A

interproximal wear

30
Q

what is happening during the inflam and laggin period in ortho

A

no movement of tooth!
When the PDL is compressed, there is a decrease in blood flow and necrosis of some PDL fibers and subsequent inflammation.

The process of inflammation leads to the recruitment of osteoclasts from the bone marrow and transient narrowing of the PDL

31
Q

forces that cause mesial drift

A
  • Generation of Anterior directed force
  • Contraction of trans-septal ligament (PDL)
  • Soft tissue Pressure- influence (tongue, muscles)
32
Q

will bone RESORPTION be occurring on the M or D wall of the ALVEOLUS during mesial drift

A

MESIAL

33
Q

will bone APPOSITION be occurring on the M or D wall of the ALVEOLUS during mesial drift

A

DISTAL

Oral Histology (12 decks)

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