dentine - pulp complex

Question 1

what cells are found in the pulp and what are their functions

Answer 1

ondontoblasts - dentine production
fibroblasts - ECM production
defence cells - protect from infection

Question 2

what is the developmental link between the pulp and dentine

Answer 2

origin of tissues - both develop from dental papilla

Question 3

what is the structural link between the pulp and dentine

Answer 3

pulpal elements extend into dentine tubules e.g ondontoblast processes, nerve terminals , dentinal fluid, immune cells

Question 4

what is the functional link between the pulp and dentine

Answer 4

dentine formation

Question 5

where does dentinal fluid come from

Answer 5

leakage from pulp capillaries.. pulp is a closed space so fluid leaked from capillaries is drained by lymphatic system or passed into dentine tubules

Question 6

what is the flow of dentinal fluid proportionate to

Answer 6

pressure inside the pulp

Question 7

primary dentine

Answer 7

formed during tooth formation and formed quickly , makes up bulk of dentine in tooth

Question 8

secondary dentine

Answer 8

formed after eruption and formed slowly throughout life of tooth

Question 9

tertiary dentine (basic)

Answer 9

laid down in response to trauma/ wear etc

Question 10

what are the two types of tertiary dentine

Answer 10

reactionary - formed by the original ondontoblasts

reparative - intense stimuli destroys ondontoblasts

Question 11

where do pulp nerves branch from

Answer 11

alveolar nerves - mandibular nerve - trigeminal nerve

Question 12

plexus of raschkow

Answer 12

branches of pulpal nerves found in the pulp below the ondontoblasts

Question 13

where do pulpal nerves enter the tooth

Answer 13

apical foreman

Question 14

what are the 5 steps of the hydrodynamic mechanism

Answer 14

stimulus - stimulus acts on exposed dentine tubules - increased dentinal fluid flow - generation of AP in intra dental nerves - AP passes to brain as pain

Question 15

what nerve fibres are activated by the hydrodynamic mechanism

Answer 15

a - delta and a - beta

Question 16

what nerve fibres are directly activated by stimuli rather than the hydrodynamic mechanism

Answer 16

c fibres

Question 17

where does the pulp get its blood supply from

Answer 17

branches of the maxillary artery

Question 18

why is water cooling essential when using high speed burs when preparing cavities

Answer 18

to maintain pulp blood flow, hiigh speed un cooled burs can cause irreversible damage

Question 19

pulpitis

Answer 19

acute inflammation in pulp
pulp cannot swell due to it being in a confined space so oedema increases pulp pressure and this change laters blood flow and nerve excitability