Extra-Coronal Provisional Restorations

Question 1

what is the role of provisional restorations

Answer 1

immediate and long term health of the tooth
success of definitive restoration

Question 2

why do we provide indirect restorations

Answer 2

aid aesthetics
tooth prep destabilises occlusion
vital teeth can become sensitive - exposed dentine

Question 3

functions of a provisional restoration

Answer 3

maintain aesthetics
prevent sensitivity
allow optimum home care
prevent microleakage/ bacterial ingress

Question 4

what will provisional restorations allow you to investigate

Answer 4

sufficient tooth prep
occlusal stability
preservation of function

Question 5

what are desirable characteristics of provisional materials

Answer 5

non irritant to pulp and perio tissues
low temperature rise during setting
adequate working and setting time
adequate strength and wear resistance
good aesthetics

Question 6

what are the two types of provisional restoration

Answer 6

custom formed - preferable
preformed - standard shapes and sizes

Question 7

what is the material used for custom resin provisional restorations

Answer 7

chemically cured bis acrylic composite resin
protemp

Question 8

how do you check sufficient reduction of preparations

Answer 8

Svenson’s gauge

Question 9

what is a Svensons gauge

Answer 9

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

Question 10

process for making a custom resin provisional

Answer 10

sectional impression with addition cured silicone putty or alginate

Question 11

what is the advantage of using addition cured silicone putty

Answer 11

can be disinfected and kept to be reused in case there are any problems

Question 12

steps of making a custom provisional restoration

Answer 12

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

Question 13

why are casts duplicated

Answer 13

so that one can be used to form a vacuum sealed stent

Question 14

when is the guidance for extra-coronal restorations created

Answer 14

provisionals

Question 15

what is acrylic on the incisal table of an articulator used for in provisional indirect restorations

Answer 15

to make sure the movements are reproducible when it comes to fabricating the permanent one

Question 16

why might you apply composite at the cervical margin of a fixed pros restoration

Answer 16

to achieve gingival stippling so the gingivae doesnt look as flat and unaesthetic

Question 17

what are examples of tooth coloured preformed provisional crowns

Answer 17

polycarbonate
clear-plastic crown forms - filled with

Question 18

what are examples of metal preformed provisional crowns

Answer 18

aluminium
stainless steel

Question 19

where are stainless steel preformed crowns usually used

Answer 19

paediatrics

Question 20

what are disadvantages of preformed crowns

Answer 20

unlikely to fit accurately
large bank of crowns needed - cost

Question 21

when picking a preformed crown what should you pick

Answer 21

one that is slightly bigger than perfect size

Question 22

what are advantages of lab made indirect provisional restorations

Answer 22

more accurate
high strength

Question 23

what is the disadvantage of lab made indirect provisional restorations

Answer 23

more costly and time consuming

Question 24

what is an essex retainer

Answer 24

like a mouthguard with one fake tooth in it

Question 25

what advice should be given to a patient after provisional restorations

Answer 25

good OH
brushing 2-3 times daily
caution with floss

Question 26

when are provisional restorations very important

Answer 26

making any drastic changes to aesthetics or occlusion