topical fluoride and sealants Flashcards
why do we use topical fluoride
inhibits demineralisation
makes enamel more resistant to erosion
can inhibit bacterial metabolism/enzyme action
how does fluoride inhibit demineralisation and erosion?
In low pH, H+ reacts with PO43- and OH- forming H2PO43- and H2O therefore less free PO43- and OH- so enamel dissolution occurs
When fluoride in oral environment fluorapatite forms OH- replaced by F-
Fluorapatite lower critical pH 4.5 than hydroxyapatite 5.5
More resistant to caries and erosion
what is the toxic dose of topical fluoride?
5mg per kg
what is the dose used of topical fluoride?
0.25ml for patients 2-5yrs
0.4ml for patient 6yrs or older
what is the acute overdose procedure for topical fluoride?
give calcium containing solution to minimise absorption, find age and weight, send to A&E
when cant you use topical fluoride?
With colophony allergy
With ulcerative gingivitis/stomatitis
Who have been hospitalised with severe asthma or allergy
glass ionomer fissure sealant is only used when?
if cant use resin sealant
what is glass ionomer fissure sealant used for?
Used to seal pits and fissure for caries prevention
what is glass ionomer fissure sealant useful for?
Useful for patients who can’t tolerate resin fissure sealant or where moisture control is a problem e.g. erupting teeth with operculum (gum tissue covering tooth)
what is resin fissure sealant used for?
Used to seal pits and fissures to prevent caries as well as seal carious lesions depriving them of nutrients
you can use a resin fissure sealant to seal a carious lesion if?
Tooth has a non-cavitated occlusal surface
Cavitation only in enamel, no exposed dentine, use composite and bonding agent then seal
Radiographically, caries extending no more than D1 (outer 1/3 dentine)
