Dentine and Pulp

Question 1

what is harder : bone dentine or enamel

Answer 1

enamel > dentine > bone

Question 2

what does dentine consist of

Answer 2

hydroxyapitite
water
organic matrix

Question 3

intertubular dentine

Answer 3

lies between tubules

Question 4

intratubular dentine (peritubular)

Answer 4

lines the dentine tubules

Question 5

what shape are dentine tubules

Answer 5

cone shaped with the smaller diameter at the EDJ

Question 6

primary curvature

Answer 6

s - shape of dentine tubules

Question 7

secondary curvature

Answer 7

small kinks superimposed on the primary curvature of dentine tubules

Question 8

why does caries feel like it is located more incisally than it really is

Answer 8

due to the primary curvature of dentine tubules

Question 9

what do dentine tubules contain

Answer 9

ondontoblast processes
unmyelinated nerve terminals (sensory)
dendrtitic cells
dentinal fluid

Question 10

what cells produce dentine

Answer 10

ondontoblast - secrete an unmineralised matrix known as pre dentine

Question 11

pre dentine

Answer 11

un mineralised matrix secreted by ondontoblasts

when reaches a certain thickness it mineralises forming dentine

Question 12

when is pre dentine formed

Answer 12

throughout life however slows with age especially after tooth eruption

Question 13

what tissue is the pulp made of

Answer 13

connective

Question 14

what is contained within the pulp

Answer 14

ondontoblasts 
fibroblasts 
defence cells 
blood vessels 
nerves 
lymphatics

Question 15

what is the gap between the ondontoblasts and the cell rich zone of the pulp known as

Answer 15

cell free zone

Question 16

calcospherites

Answer 16

centres of mineralisation where the calcification of dentine occurs

Question 17

tertiary dentine

Answer 17

laid down rapidly in response to trauma

contains either no tubules or empty tubules (dead tracts)