Cementum

Question 1

the cementum is similar to bone except cementum has…

Answer 1

no blood supply just for itself

doesnt resorb like bone

Question 2

what is the difference between acellular and cellular cementum

Answer 2

acellular- 1st formed, over all of root

cellular- 2nd formed, contains CEMENTOCYTES, root apex

Question 3

what are cementoblasts

Answer 3

cementum forming cells- lay down the cementum matrix

Question 4

composition of cementum

Answer 4

65% inorganic (HAP)
23% organic (type 1 collagen fibrils making matrix)
12% h20

NB. same as bone

Question 5

there are three junction types between the enamel/ cementum. what are they

Answer 5

overalp, 70%
butt join, 20%
gap, 10%= highly sensitive, caries prone

Question 6

incremental lines in cementum

Answer 6

lines of salter (similar to resting lines in bone)

Question 7

what is pre-cementum

Answer 7

non-mineralised cementum

Question 8

where is pre-cementum found

Answer 8

between the cementoblasts and mineralised cementum

Question 9

which cell produces the Sharpey’s fibres in cementum

Answer 9

fibroblasts from the periodontal ligament

Question 10

how do Sharpey’s fibres form

Answer 10

fibres from unmineralised periodontal ligament, insert into
cementum and are called sharpey’s fibres.

the mineralised cementum between the Sharpey’s fibres= intrinsic cementum

Question 11

what is the difference between the Sharpey’s fibres found in cementum and those found in the periodontal ligament

Answer 11

in cementum, the fibre is mineralised

in periodontal ligament, the fibre is unmineralised