core build up technique

Question 1

what is it

Answer 1

1) a restoration replacing lost tooth structure before tooth is prepared for a crown
2) lost tooth structure
- due to extensive caries or fractured cusp
3) replace a large filling
4) fill up space of endo treated teeth
5) calls for crown prep to be idealized
6) is a crown is being replaced, the old buildup should be replaced

Question 2

substructure foundation

Answer 2

1) retention, stability, strength
2) may serve for an extended period of time
3) should be contours and finished

Question 3

to rstore or not the restore

Answer 3

1) amount of tooth remaining
2) foundation of substructure required (Build up)
3) ferrule and margins need to be on TOOTH!
4) crown to root ratio (crown lengthening?)

Question 4

composites for build up

Answer 4

1) anchor
2) photocore
3) Universal composite

Question 5

anchor

Answer 5

• opaque
• macrofilled
• dual cure
• self-mixing

Question 6

photocure

Answer 6

• transparent
• macrofilled
• compule dispensed

Question 7

universal composite

Answer 7

• nano-filled
• custom shades and translucencies

Question 8

buildup protocols

Answer 8

1) rubber dam
2) composite techniques apply
3) all old materials and caries must be removed
4) if tooth is endo
- must need 50% or more coronal tooth structure
- if not, post

Question 9

self-etch dentin bonding

Answer 9

1) 6th generation (prelude)
2) acidic primer
- replaced phosphoric acid gel
- used on dentin
- less good on enamel
3) adhesive
- 4th generation equivalent
- mostly hydrophobic
5) poor bond to enamel

Question 10

adhesives for build-ups (prelude)

Answer 10

1) dual cure and opaque
- anchor
- rock core
2) 6th generation (prelude)
- alloq for light cure adhesive to be autocure
- when bonding to opaque resin
- neutralize acidity of primer
- cure OIL of the adhesive
- no equivalent for scotchbond

Question 11

other adhesives for build up

Answer 11

1) light cure and translucent
- photocore
- harmonize
2) prelude
- primer
- adhesive
- no need for link
3) scotchbond
- light cure only

Question 12

anchor properties

Answer 12

1) core buildups
2) cementing posts
3) dual cure chemistry
- light cure to self cure in 5 mins
4) white /A2 shades
5) cuts like dentin!
6) radiopaque

Question 13

amalgam build up

Answer 13

1) good seal
2) amalgam tattoos
3) retentive features
4) uncommon at pacific

Question 14

glass ionomer

Answer 14

1) weak compressive strength
2) ionic bond
3) fluoride release

Question 15

mechanical retention

Answer 15

1) in addition to dentin bonding, consider mechanical placement in the prep
2) grooves, channels, pot holes, and undercuts and used to secure the buildup
- place with #330, 1/4, 1/2, or 1 round bur
3) place far enough axially to prevent undermining enamel or obliteration of margin of future crown
- stay away from pulp

Question 16

steps

Answer 16

1) calls must be under cut
- 0.75 mm diameter, 0.5 mm deep
2) tofflemire retainer
- burnish both contacts
- retainer and wedge on LINGUAL to create buccal opening
3) apply activa liner
4) selective etch 37% phosphoric acid on enamel
- rinse
5) prelude system
- scrub primer for 10 seconds, air thin
- adhesive for 10 seconds, air thin
- wait 2-5 minutes for chemical rxn, then light cure
- apply link, air thin
- anchor (build up material)
- do not carve, material will slump and cure 2-5 min

Question 17

shaping

Answer 17

1) #8 round bur for quick shaping of occlusal
football carbide
2) treetop for axial
3) check profiles