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Flashcards in Tooth Morphology Deck (15)
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1

Branches of pulpal nerves fan out into the subodontoblastic layer. What are these called?

Raschow's plexus

2

Dentinal tubules contain nerves. Which part of dentine contains the most nerves?

dentine under cusps (40% of tubules contain nerves here)

3

What is the percentage of nerves found in coronal dentine and root dentine?

coronal dentine = 15% of tubules
root dentine = 4% of tubules

4

How may outward fluid flow be caused in dentinal tubules?

cooling, drying, evaporation, hypertonic solutions, decreased hydrostatic pressure

5

How may inward fluid flow be caused in dentinal tubules?

heating, mechanical, increased hydrostatic pressure

6

How are A beta and A delta nerve fibres activated in dentine/pulp? What do these mediate?

activated by hydrodynamic stimuli applied to dentine
probably mediate 'normal' dentinal sensitivity

7

How are C fibres activated in dentine/pulp? What do these mediate?

probably activated directly by stimuli, rather than hydrodynamic mechanism
they respond to most forms of intense stimulation
probably mediate pain associated with pulpal inflammation (eg caries)

8

Where does the blood supply for all teeth come from?

branches of maxillary artery

9

A cell free zone in present in dental pulp tissue beneath the odontoblast layer. What is this called?

Basal layer of Weil

10

Describe the immediate responses of dentine/pulp to injury.

immediate: nociceptor activation - pain
after approx. 1 min: early inflammatory response, kinins, prostaglandins, neuropeptides released, vasodilation

11

Describe the dentine/pulp responses to injury after approx. 10 mins.

nociceptor sensitisation (biting will now hurt the patient)
extravasation of fluid, oedema
polymorph migration

12

Describe the dentine/pulp responses to injury after approx. 100 mins.

enzyme activation; nerve growth factor
monocyte presence

13

Describe the dentine/pulp responses to injury after approx. 1 day.

nerve sprouting (NGF)
increased axonal transport
altered excitability of CNS synapses

14

Describe the dentine/pulp responses to injury after approx. 1 week.

repair; tertiary dentine formation
NB: completion of repair and recovery occurs at variable times

15

During tooth development, what is dentine and pulp developed from?

dental papilla