Alveolar Bone

Question 1

where is the alveolar bone

Answer 1

the specific region of mandible or maxilla bone that supports tooth

Question 2

which cells form the organic bone matrix

Answer 2

oSTEOBlasts

Question 3

alveolar bone is a bone. name 5 properties of bone alveolar bone has

Answer 3

plasticity (re-model/ model itself)
mineralised 
reservoir for ions, ca2+
attachement to muscles 
provide framework for bone marrow

Question 4

composition of alveolar bone

Answer 4

65% inorganic, HAP
23% organic
12% water

Question 5

what is compact bone

Answer 5

highly dense, sold bone

arranged in layers

Question 6

what is cancellous bone

Answer 6

spongy bone

Question 7

what are the layers of compact bone

Answer 7

circumferential layer (outer and inner), parallel layers
haversian system layer (in between, small/ concentric)

Question 8

how is alveolar bone found around in anterior teeth

Answer 8

• interior and exterior cortical plates fuse together

Question 9

how is alveolar bone found around posterior teeth

Answer 9

cancellous bone

- inner cortical plate forms a socket wall, then there is a layer of cancellous bone, then the outer cortical plate

Question 10

regions where Sharpey’s fibres found in alveolar bone are called

Answer 10

bundle bone

Question 11

difference between sharpey’s fibres in alveolar bone and cementum

Answer 11

in alveolar bone:

- less numerous but larger

Question 12

how are osteocytes formed

Answer 12

when osteoblasts become embedded into the organic extracellular matrix

Question 13

osteocytes are different to osteoblasts. how

Answer 13

no extensive ER

have cell-cell contact= canalculi

Question 14

the organisation in alveolar bone = osteoblasts, osteoid, alveolar bone. what is osteoid

Answer 14

the un-mineralised layer (similar to pre-cementum)

Question 15

incremental lines of alveolar bone

Answer 15

reversal lines: change from bone resorption to deposition

scalloped outline

Question 16

what are osteoClasts

Answer 16

cells which carry out bone resorption and matrix degradation

Question 17

where are the multi- nucleated osteoclasts found

Answer 17

in the Howship’s Lacuna- deep in the surface of bone

Question 18

how do osteoclasts degrade alveolar bone

Answer 18

form a brush border with high microvilli no.
increases SA for pumping h+/ e-
high H+= low pH= dissolves HAP
lysosomes= degrade the matrix of bone

Question 19

what is the annular zone

Answer 19

zone found around the brush border of osteoclasts that retains the acidic environment to a localised area