Alveolar Bone Flashcards

1
Q

What are the 2 incremental lines in bone?

A
  • Reversible (where the bone has been resorbed and reversed)

- Smooth (Marks a former surface of bone deposition)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the Osteoid?

A

where active bone formation is occurring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe the properties of osteoblasts

A
  • Mesenchymal origin
  • mineralise organic matrix
  • incorporated into the bone as osteocytes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Describe the properties of Osteocytes

A
  • Mesenchymal in origin
  • Lie within the bone
  • These are the most abundant cell within bone
  • Communicate via canaliculi
  • Detect strain in the bone
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe the properties of osteoclasts

A
  • Hemopoietic in origin
  • Multinucleated
  • Resorb bone
  • Ruffled border
  • Pumps acid to degrade bone
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are bone lining cells?

A
  • A layer of flattened cells that occur when bone is in neither the formative or resorbitive state
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How is bone organised?

A
  • Cancellous bone

- Compact bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is cancellous bone?

A
  • Lamella from trabeculae

- Lattice arrangement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is compact bone?

A
  • At external and internal surfaces of the lamella
  • surrounding bony surfaces
  • Dense solid mass
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is combination bone?

A
  • A combination of both cancellous and compact bone (providing maximum strength at minimum skeletal weight)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What percentage of bone is inorganic?

A

60% hydroxyapatite crystals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What percentage of bone is organic?

A

25% type 1 collagen and protein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what percentage of bone is water?

A

15%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is included in the organic matrix of bone?

A
  • 90% collagen fibres

- proteins: proteoglycans, glycoproteins, osteocalcin, growth factors, serum proteins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

where do sharpeys fibres occur in the bone?

A
  • pale zone (unmineralised)
  • bundle bone (extending deep into the alveolar bone)
  • Osteoblasts (lie between the periodontal ligament and the alveolar bone)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the stages of bone remodelling?

A
  • Resting
  • Resorption
  • Reversal
  • Formation
17
Q

What occurs during the resting stage of bone remodelling?

A
  • Formation ceases following mineralisation
18
Q

What occurs during the resorption stage of bone formation?

A
  • Migration and activation of osteoclasts causing bone resorption
19
Q

What occurs during the reversal stage of bone formation?

A
  • Cessation of resorption and the disappearance of osteoclasts by apoptis or migration
20
Q

what occurs during the formation stage of bone formation?

A
  • Osteoblast recruitment

- formation of new bone