Dentine and Pulp

Question 1

dental pulp contains

Answer 1

connective tissue, odontoblasts, fibroblasts, defence cells
fibres, matrix, sensory/autonmic nerves
blood vessels, lymphatics

Question 2

function of pulp

Answer 2

nutritive [blood v], dentine growth, dentine repaire, defence
sensory [pain]
dentinogenesis control [fomration]

Question 3

dentine fluid

Answer 3

leaks from pulp to interstitual space, defence role
dififuclt to bond to

Question 4

tertiary dentine

Answer 4

in response to stimulus, laid down by odontoblast
mild - primary, severe - secondary odonto
plug function, seals tubules from access to pulp, protects vital tissue from exterior threat

Question 5

exchange of material between dentine and pulp

Answer 5

pulp -> dentine
- nutrients, formation of tertiary dentine
dentine -> pulp
- diffusion of toxins from bacteria, filling materials

Question 6

anatomy of pulp nerves

Answer 6

branches of alveolar, enter via apical foramen
fan out in sub-odontoblastic layer, some enter dentinal tbules
innervtes in tubles, less in coronal and root

Question 7

hydrodynamic mechanism

Answer 7

stimuli on surface of dentinal tubules
increase rate of dentinal flow, generating action potentials in intra-dental nerve, passed to brain as pain
ACTIVATION OF INTRA-DENTAL SENSORIAL NERVES, GENERATES PAIN
outwards/inwards
outwards - cooling/drying [GREATER STIMULI]
inwards - heating, pressure

Question 8

stimuli acting directly on intra dental nerves

Answer 8

intense heating/cooling, electrical current, pain producing chemicals, high fillings distorts dentine and alters tubular fluid flow

Question 9

intra-dental nerve properties

Answer 9

A beta/delta fibres [myelinated]
- activated by hydrodynamic stimuli
c fibres [unmyelinated]
- activated by stimuli directly, response, pain with pulp inflammation

Question 10

function of pulp nerves

Answer 10

sensory [mediate pain], contorl of pulp blood vessels, promote inflammation, dentine formation, facilitate immune response

Question 11

dentine-pulp response to injury

Answer 11

immediate - pain
1m - inflammation vasodilation
10m - sensittisation
100m - enzyme
1day - nerve sprouting
1week - tertiary dentine
variable - completion of repair and recovery

Question 12

pulpitis

Answer 12

acute inflammation in pulp, but cannot swell due to pulp chamber
oedema increase in pulp pressure, variable effects on blood flow and nerve excitability