Extra-Coronal Provisional Restorations Flashcards
what is the role of provisional restorations
immediate and long term health of the tooth
success of definitive restoration
why do we provide indirect restorations
aid aesthetics
tooth prep destabilises occlusion
vital teeth can become sensitive - exposed dentine
functions of a provisional restoration
maintain aesthetics
prevent sensitivity
allow optimum home care
prevent microleakage/ bacterial ingress
what will provisional restorations allow you to investigate
sufficient tooth prep
occlusal stability
preservation of function
what are desirable characteristics of provisional materials
non irritant to pulp and perio tissues
low temperature rise during setting
adequate working and setting time
adequate strength and wear resistance
good aesthetics
what are the two types of provisional restoration
custom formed - preferable
preformed - standard shapes and sizes
what is the material used for custom resin provisional restorations
chemically cured bis acrylic composite resin
protemp
how do you check sufficient reduction of preparations
Svenson’s gauge
what is a Svensons gauge
a ruler that has a retractable needle
once the tooth is prepared and provisional restoration prepared - put the provisional in the gauge and see how thick it is
process for making a custom resin provisional
sectional impression with addition cured silicone putty or alginate
what is the advantage of using addition cured silicone putty
can be disinfected and kept to be reused in case there are any problems
steps of making a custom provisional restoration
putty sectional impression
prep tooth for inlay
inject protemp into sectional impression
seat impression back on and then take it back off
remove excess flash or edges
check provisional thickness
cement in provisional with temp bond
why are casts duplicated
so that one can be used to form a vacuum sealed stent
when is the guidance for extra-coronal restorations created
provisionals
what is acrylic on the incisal table of an articulator used for in provisional indirect restorations
to make sure the movements are reproducible when it comes to fabricating the permanent one
why might you apply composite at the cervical margin of a fixed pros restoration
to achieve gingival stippling so the gingivae doesnt look as flat and unaesthetic
what are examples of tooth coloured preformed provisional crowns
polycarbonate
clear-plastic crown forms - filled with
what are examples of metal preformed provisional crowns
aluminium
stainless steel
where are stainless steel preformed crowns usually used
paediatrics
what are disadvantages of preformed crowns
unlikely to fit accurately
large bank of crowns needed - cost
when picking a preformed crown what should you pick
one that is slightly bigger than perfect size
what are advantages of lab made indirect provisional restorations
more accurate
high strength
what is the disadvantage of lab made indirect provisional restorations
more costly and time consuming
what is an essex retainer
like a mouthguard with one fake tooth in it
what advice should be given to a patient after provisional restorations
good OH
brushing 2-3 times daily
caution with floss
when are provisional restorations very important
making any drastic changes to aesthetics or occlusion
