Sensation from Teeth Flashcards
what are the sensations from teeth
tooth - PDL
pain - denitene/PDL
cold - gingiva, dentine/PDL
what awesome pain producing stimulus
electric current heat cold mechanical drying hypertonic solution hydrostatic solution algogenic chemicals
what is the innervation of pulp
dense inv
extensive branching
myelin - A delta and beta
unmylin - C
what si the inv of dentine
extend into tubules
over pulp horns
neurones are activated and sensitised by
inflam mediators
what is substance p
form axon reflex
enhances nociceptors an thermorecptors
what re the theories of dentinal sensitivity
dentine inv
ododobalst receptor theory
hydrodynamic theory
where is most inv dentine
predeneitne over pulp horns
how is dentine inv
sparsley
in ododnobals receptor theory what happens to the stimulus
transduction via the odontoblast process
communication between ododntoblasta nd primary afferent
what sit he problem with ododntblast receptor theory
no evidence of electrical communication them synapses between odontoblast and nerve
odontoblast process extend only 1/3 into dentie
what is the hydrodynamic theory
stimuli cause pain when applied to dentine
increased fluid flow in dentine
gen AP in intradental nerves
AP rate linked to fluid flow
what causes an outward flow
cooling drying evaporation hypertonic solutions decrease hydrostatic pressure
why are intradental nerves more sensitive to outward flow
nerves may contain stretch sensitive ion channels
what are the nerves involved
unmyelinated endings A delta and beta
