dentine and pulp Flashcards
what is dentine?
main supporting structure of the tooth found beneath the enamel and cementum
what forms the bulk of the tooth?
dentine
what is the only tissue in the body harder than dentine?
enamel (dentine has a greater tensile and compression strength)
describe dentine
- it is permeable as it contains tubules
- it contains cell processes
- its ivory in colour
- if enamel is increased, dentine is increased
what is the content of dentine?
- hydroxyapatite 70% weight, 50% volume
- organic matter 20% weight, 30% volume
- water 10% weight 20% volume
what surrounds and lines dentine tubules?
peritubular dentine
what lies between dentine tubules?
intertubular dentine (lower mineral content than peritubular dentine)
what happens to dentine tubules?
the lumen narrows overtime
what shape are primary curvature dentine tubules?
S shaped
what shape are secondary curvature dentine tubules?
wavy
what can dentinal tubules be a pathway for?
toxins
what is globular dentine?
a result of defficient mileralisation
which cells produce dentine?
odontoblasts
what is the content of dentine tubules?
- odontoblast processes (extentions)
- unmyelinated nerve terminals
- dendritic cells
- dentine fluid from pulp
where is dental pulp?
in the tooth’s core
what is dental pulp?
a connective tissue
what does dental pulp contain?
- cells
- extracellular components
- nerves
- blood vessels
-lymphatics
what cells are present in dental pulp?
- ondontoblasts
- fibroblasts
- defence cells
what are the extracellular components of dental pulp?
- fibres (collagen and oxytalan)
- matrix (proteoglycans, chondritin SO4 and dermatin SO4)
what nerves are present in dental pulp?
sensory nerves (sympathetic autonomic nervous system)
what are the functions of dental pulp?
- produce dentine
- nutritive
- dentine growth/repair
- defence (immune cells/lymphatics)
- neural- sensory
what is dentogenesis?
un-mineralised dentine
