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Flashcards in Alveolar Bone Deck (73):
0

% of inorganic composition of alveolar bone?

67% hydroxyapatite

1

% of organic composition of alveolar bone?

Collagen %?

Noncollagenous %?

33%

28%

5%

2

Forces alveolar bone can best resist? (2)

  • Compressive forces
  • Forces directed along the long axis of the tooth

3

Forces alveolar bone can least resist? (2)

  • Tensile forces
  • Slicing forces

4

Functions of alveolar bone? (4)

  • Support and protection
  • Attachment of muscles
  • Reservoir of minerals
  • Hemopoiesis

5

Part of maxilla and mandible with the teeth and alveolar sockets?

Alveolar process

6

It is where the alveolar process rests.

Basal bone

7

True or false. Proper development of tooth depends on the alveolar process?

False.

Proper development of alveolar process is dependent on tooth eruption

8

True or false. Alveolar process may be found in newborns?

False. No teeth, no alveolar process

9

True or false. If bone is lost, remodeling occurs and alveolar process is restored

False. No more alveolar process after bone remodeling

10

It is what occurs after remodeling of alveolar bone.

Residual ridge

11

Compose of outer and inner cortical plate of bone that encloses the spongiosa?

Alveolar process

12

Other terms for spongy bone?

Trabecular or cancellous bone

13

Lines the alveolus contained within the alveolar process?

Alveolar bone proper

14

Perforations of the alveolar bone?

Cribriform plate

15

It is formed by the coronal rim of the alveolar bone.

Alveolar crest

16

Alveolar bone parallels the CEJ at a distance of ____ apical to it.

1-2mm

17

True or false. Alveolar bone proper may be fused with the cortical plate of the alveolar process?

True

18

Radiographic term for alveolar bone proper?

Lamina dura

19

Cell responsible for mineralization of bone?

Osteoblast

20

Osteoblasts synthesize what? (2)

  • Type I and IV collagen
  • Cytokines

21

Osteoblasts are derived from what cells?

Mesenchymal stem cells (BM-MSC and liver; CB-MSC)

22

When bone formation stops, osteoblasts become inactive and termed as?

Bone lining cells

23

True or false. The faster bone formation, the more osteocytes trapped.

True

24

Cells responsible for osteolysis and osteoplasia?

Osteocytes

25

Cells that prevent hypermineralization of bone by pumping Ca back to the blood stream?

Osteocytes

26

True or false. After bone formation, osteocytes lose the ability to form matrix and becomes smaller?

True

27

Limited resorption of bone in lacunae and canals?

Osteolysis

28

Secondary rebuilding of perilacunar bone mineral?

Osteoplasia

29

Osteoclasts are located on?

Howship's lacunae

30

Organelle-poor brush like cytoplasmic border of osteoclasts which demarcates the bone of resorption?

Ruffled border

31

Ruffled border of osteoclast release what? (2)

  • Acids
  • Proteolytic enzymes

32

Part of osteoclasts attached to bone during resorption?

Sealing zone

33

Sequence of resorptive events (4)

  1. osteoclast attach to bone
  2. creates sealed environment
  3. releases acid to demineralize hard tissues 
  4. secretes proteolytic enzymes to degrade organic matrix

34

Encloses the entire bone forming outer and inner perimeter?

Circumferential lamellae

35

Makes up the bulk of compact bone?

Concentric lamellae

36

Fragments of preexisting concentric lamellae from osteons created during remodeling?

Interstitial lamellae

37

Fibrous membrane that surrounds the compact bone?

Periosteum

38

Periosteum that contains bone cells and precursors?

Inner layer

39

Periosteum which is more fibrous and gives rise to Sharpey's fibers?

Outer layer

40

It separates the bone surface from the bone marrow?

Endosteum

41

Lamellae of bone that are arranged in flattened spicules?

Spongy bone

42

3 structures of the alveolar bone?

  • Cortical plate
  • Alveolar bone proper
  • Spongiosa

43

Cortical plate is continuous with the alveolar bone proper at the?

Alveolar crest

44

Cortical plate is thicker in the mandible or maxilla?

Mandible

45

Cortical plate is greater on labial or lingual side?

Lingual

46

Bone found in areas of recent apposition penetrated by the Sharpey's fiber?

Bundle bone

47

2 locations of hematopoietic marrow?

  • Maxillary tuberosity
  • Angle of mandible

48

Spongiosa is more in maxilla or in mandible?

Maxilla

49

3 mechanisms of bone formation/ossification?

  • Endochondral/intracartilaganious
  • Intramembranous
  • Sutural bone growth

50

True or false. In endochondral ossification, cartilage develops and becomes the bone.

False. Cartilage is replaced/substituted by bone

51

Endochondral ossification occurs where?

In the condyles

52

Type of ossification in which bone develops directly from fibrous tissue?

Intramembranous ossification

53

Intramembranous ossification is found where? (3)

  • Maxilla
  • Body of mandible
  • Cranial vault

54

Cartilage of the first branchial arch?

Meckel's cartilage

55

Meckel's cartilage is found on mesial or distal side of mandible?

Mesial

56

When does intramembranous ossification of mandible begins?

At the 7th week

57

When is rudimentary mandible formed?

At the 10th week

58

Fates of Meckel's cartilage. (4)

  • Incus
  • Malleus
  • Sphenomandibular ligament
  • Sphenomalleolar ligament

59

Cartilages of the mandible. (3)

  • Condylar cartilage (12th week)
  • Coronoid cartilage (4th month)
  • Symphysis cartilage (obliterated w/in the 1st yr)

60

Only cartilage that remains in the mandible?

Condylar cartilage

61

Incremental lines of alveolar bone?

Cementing lines

62

Alveolar line formed by new bone layer and resorption?

Reversal line

63

Line found on the surface of inactive bone?

Aplastic line

64

Line formed by new bone layer from inactive old bone

Resting line

65

True or false. Thicker trabeculae and smaller marrow spaces indicates increased function?

True

66

True or false. Thin trabeculae with wider marrow spaces indicates decreased function?

True

67

Pressure to bone results to _____?

Tension to bone results to ______?

Resorption

Deposition

68

It depends on the functional and nutritional demands of bone.

Bone remodeling

69

An important diagnostic landmark of alveolar bone?

Lamina dura

70

Window-like defect in which the bone resorb locally and cause the root to be seen?

Fenestration

71

Occurs when the rim of the bone between the fenestration and the alveolar crest disappeared together?

Dehiscence

72

Hyperfunction of the pituitary gland which causes overgrowth of bone?

Acromegaly