When Prevention Fails Flashcards
when is restoration or extraction required
cavity prep
systematic approach
only recover tooth if sufficient viable tooth substance
why are the classifications of caries
1 2 3 4 5
what is class 1
occlusal of molar and p molar
buccal pits of molars
what is class 2
approximal of molars and p molars
what si class 3
approximal surfaces of incisors and canines
what is class 4
incised edges of incisors and canines
what is class 5
cerical margin
what are the principles of cavity prep
convenience form outline form resistance retention form treatment of residual caries corrections of enamel margins cavity debridement
what is outline form
defining the shape
what is resistance form
ability of cav to resist movement of restorations in it
what is retention form
resist forces to displace
parallel sided cavity - no undercuts
what is imp about an undercut
restoration will not withdraw
what is treatment of residual caries
removal by excavation
what is correction of enamel margins
cliff hanging of enamel over restoration - too much = unsupproting can cave
how do you correct an enamel margin
remove weakened tooth substance
facilitate placement of matrix retainers
bevel to increase SA for bonding
what is bond strength
force to remove divided by SA
what tools are used in cavity debridement
triple syringe
aspiration
how is residual caries rid of
using large bur as opposed to small as slower, force per unit less off easy
excavator
caries dyes
chemchemical method
what is the chemochemical method of ridding of caries
carislov
proteolytic action
reduces need for LA
what does carislov contain
active components
- amino acids - leucine, lysine and glutamic acid
- sodium hypochlorite
what is stepwise excavation
caries removal dontn expo pulp
why use stepwise exaction
cear periphery don’t touch pulp
free cav floor
line CaOH temporary glass ionomer resin
how can augment the retention afforded by the cavity design
acid etch
dentine bonding
what does acid etch ad dentine bonding reduce the need for
mechanical creation of undercuts for retentive purposes and conserve tooth subs
what is used acid etch technique
buonocore
what is the way acid etch is done
application of acid gel
decalcification of enamel prisms
micro mechanical tags intowhcih bonding resin may flow
why ar dentine pins
used as reinforcement mechanical retention
plunged into dentine via pin channel by sp drill appropriate
where are dentine pins placed
placed at corners of tooth
when is dentine pins used
used for amalgam where one or more cusp is missing
one pin per cusp
what is dentine pin risk of
pulpal exposure
pdl
and today rarely used
what is to be considered when choosing a restorative material to be used
amalgam and resin composite non adhesive
adhesive agents
glass polyalkenote is adhesive
what is important of conservation of tooth substance
restorations don’t last forever
small is beautiful
preserve oblique ridge in max molars
what do u do when preparing cavity
minimise further plural injury
water coolant
aim to maintain pulp cell function and viability
reduce probability of post op complications
what needs to be considered as potential damage when restorations are taking place
remaining dentine thickness
cavity morphology - depth, area, volume
restorative material
the do u restore
where caries active or aesthetic
what kind of caries removed
soft caries
for deep penetrating lesions avoid
exposure by stepwise techniques
