hard tissues Flashcards
ideal properties of a tooth
string, aesthetic, hard
collagen gives what to teeth
strength
order of tooth properties
enamel, adj, dentine, pulp
cementum lower
why higher fluoride content in teeth is better
more resistant to acid attacks - caries reduced risk
however etch doesnt work as well
hydroxyapitite
exists in crystals
repeats in sheets
outer calcium stacked on top but inner triangle flips orientation to help
mineral
complex- requires a template EPITAXY(collagen)-TEETH AND BONE
hard tissue forms in kidney - kidney stones and gall bladder
how the lattice remains stabile
ions in and out
oh can swap in the lattice
with fluoride- better (fluorapitie)
as higher resistance to demineralisation lower ph 4.5
enamel properties
hydroxyapitite
hard- requires a diamond bur
forms enamel prisms (rods)
prisms are visable after etching the tooth
what does etch make visible
enamel prisms
surface enamel properties
more resistant acid attacks - higher fluoride levels
no prisms
dentine properties
tubular- vital
slow and high speeds
vascular
carious dentine very soft
