Fluoride Flashcards
(21 cards)
what are the beneficial potential of fluoride
enamel solubility
plaque bacteria
tooth morphology
what is a potential problem in fluoride
fluoride and mottling
what si fluoride ion profile
F ion smaller the OH
ionic radius 1.29 angstrom
stable crystal sutra
how does fluoride have an effect
enters voids or exchanges with OH
fluorohydroxyapatite
fluorapatite
what is the critical pH of HA
5..5
what is the critical pH of fluorapatie
4.5
what does fluorapapite quire for dissolution of mineral
larger pH fall
how does fluoride affect enamel
larger stable crystal structure
lower critical pH more resist dissolution
promote remin
what si Fluorde n plaque relationship
plaque accumulate fluoride
4-10 ppmF
saliva contain 0.02 ppmF
of oral or plaque pH above critical level
fluids supersaturated
dissolution doesnt occur
if oral or plaque pH falls below critical pH
fluids are under saturated
dissolution occurs
plaque pH below 5.5
plaque undestaurate with respect to HA
dissolution HA
plaque pH above 4.5
supersaturated fluorpatiete promote rmeineralistaon
surface zone
relatively intact zone
30uM thick
highlymieralised high F content
F inhibits what
enzymes involved in glycolysis
- less lactic acid prod
- enolase
storage polysac inhibit
fluoride is toxic to
bacteria only in high F
animal experiments F causes
rounded cusps
shallower fissures
what are the types of fluorissi
mild - fine white lines
mod - opaque discoloured enamel
severe - loss enamel
what is florosis
hig F expo in tooth dev
- F drops
- swallowed toothpaste
what are normal amelogenesis
nearly all matrix proteins amelogeneisn are dreaded and removes
- crystal growth
how does fluorosis affect ameologenin
reduced enamel matrix protein amelogenins deg
increased retention amelogenins
incomplete crystal growth
