Ob Lecture 11A Pt 1

Front 1

which 3 impt structures are all connective tissue?

Back 1

cement, PL, alveolar bone

Front 2

Why is cement of particular interest?

Back 2

role in caries, periodontal disease, tooth movement, it can repair root

Front 3

3 diff ways cement can meet enamel?

Back 3

OVERLAP- 60 PERCENT
MEET and fuse- 30%
Gap- dentin is exposed

Front 4

where is mose cement deposited

Back 4

APICALLY- 150- 200 umm

Front 5

order from bone to dentin?

Back 5

alveolar bone, PL (AE cement), CI cement, hyaline layer, Tomes granular layer, dentin

Front 6

appearance of cement?
structure characteristics?

Back 6

pale yellow, dull in colour.

softer than dentin, more permeable (especially cell area
can be more mineralized in some areas

Front 7

Chemical makeup of cement?

Back 7

65% inorganic (hydroxyapetite), 23 % organic (collagen, mostly T1) 12% water

Front 8

where is cement acellular? cellular?

Back 8

cellular- apical part of tooth

acellular- cervical part

Front 9

What kind of cement is acellular?
What kind of cement is cellular? CI

American eagle?

Back 9

acellular- extrinsic= perpendicular to root, found cervically

cellular- intrinsic- parallel, do not anchor, found apically

Front 10

how is cement made? BRIEF

Back 10

organic layer layer down first i.e. cemented, then mineralized

Front 11

What structure doe cellular cement resemble? how?

Back 11

cellular cement resembles bone. Cementocytes live in lacunae, communicate via canliculi, have gap junctions....NO BLOOD VESSELS IN CEMENT, GET NUTRIENTS VIA DIFFUSION (GAP JUNCTIONS))

Front 12

Growth factors influencing cement formation?

Back 12

boston pizza food- Bone morphogenic protein --> differentiation

insulin and platelet derived growth factor-cell cycle

Fibroblast growth factor- blastoff! cell migration/adhesion

Front 13

adhesion molecules of cement?

Back 13

osteopontin- regulates crystal formation

bone sialoprotein- adhesion to root and mineralization

Front 14

other factors influencing cement?

Back 14

gal proteins= crystal formation

endothelial enamel like proteins- differentiation

collagen- ensure there is tissue space open

Front 15

how do canaliculi b/w cementoblasts communicate?

Back 15

via gap jxns

Front 16

compare and contrast...acellular cement first

Back 16

acellular- no cells, not a distinct boundary with dentine, forms slow, close incremental lines, no pre cement

Front 17

cellular cement...contrasted with acellular

Back 17

cellular- has cells (contained in lacunae and canaliculi with cementoocytes and their processes), demarcated boundary with dentine, forms fast, incremental lines far apart, has pre cement

Front 18

2 CRITERIA CEMENT IS BASED ON?

Back 18

1) WHETHER IT HAS CELLS (ACELLULAR, CELLULAR)

2) ITS ORIENTATION (EXTRINSIC, INTRINSIC)

Front 19

2 places does AE cement come from?

Back 19

mostly the PL, but the ones from the cementoblasts form the fibrous fringe

Front 20

afibrillar cement?

Back 20

FOUND B/W CEMENT AND DENTIN AKA INTERMEDIATE CEMENT

NO COLLAGEN, hence why its called fibrillar

Front 21

how does cement age?

Back 21

get more abrasive, hypercalcified collagen bundles

Front 22

What happens to cement during trauma?

Back 22

CEMENT will undergo resorption during trauma, cementocytes will repair the cement and the dentin sine odontoblasts cannot repair dentin at the surface.

CEMENt PROTECTING THE ROOT!

Front 23

hypercementosis?

Back 23

inflammation of root/cement,

due to tooth eruption or periodical

Front 24

maintenance of the tooth in the socket is up to 3 impt structures...name em

Back 24

alveolar bone, PL, cement

Front 25

how thick is PL? what does it contain?

protects against?

Back 25

150-380um....blood vessels, nerves, lymph tissue

PL important for mastication, contains stretches and relaxes whenever teeth are clenched

Front 26

collagen fibers in PL?

Back 26

mostly type 1 (70%), sand type 3 (20%)...type 3

mostly for areas of high turnover i.e. fetal

type 4 and 7 involved in blood vessels,

type XII regulates PL architecture (theory)

Front 27

what is a principle fiber? how thick?

Back 27

principle fivers stretch whole length of ligament, usually 5um in diameter, branch out