temporary restoations

Question 1

use for temporary restorations

Answer 1

1) fractured teeth or restorations
- usually emergency
- lacking time to restore the tooth definitively
2) in the management of extensive gross caries: stabilisation technique
- can remove caries and place GIC quickly
- once caries risk reduce can then give final restorations
3) Root canal treatment
4) if treatment ends suddenly eg medical emergency
5) help control pain eg in cases of acute pulpitis
- Zinc oxide eugenol

Question 2

temporary restorations materials

Answer 2

1) Zinc oxide eugenol materials
2) Zinc oxide and zinc/calcium sulphate materials
3) polycarboxylate cements
4) glass ionomer cements
5) composite resins

Question 3

zinc oxide eugenol material and ad/dis

Answer 3

• powder zinc oxide
• eugenol liquid
  1) antibacterial
  2) obtundent i.e. are pain relieving
• due to the eugenol
  3) Cheap, easy to use and place
  4) colour is different to tooth tissue
• easy to distinguish
  5) easy to remove
• not adhesive

DIs

1) limited biocompatibility
2) non adhesive
3) variable marginal sealing/leakage
- mechanically weak
4) poor compressive strength
5) low surface hardness
6) may inhibit composite resin polymerisation
- due to eugenol
7) poor aesthetics
- limited to posterior teeth

Question 4

zinc oxide materials and brand names

Answer 4

Absence of eugenol
Set upon contact with saliva
1) Cavit – ZO and CS(3M ESPE)
2) Coltosol – ZO and ZS (coltene/whaledent)

Question 5

ad and dis for zinc oxide

Answer 5

1) Cheap
2) easy to use and place
3) colour is different to tooth tissue
4) no eugenol
- preferable if placing composite as a definitive restoration
- no pain relieving factors
Disadvantages
1) Non adhesive
- needs to be used in a retentive cavity
2) Variable marginal sealing/leakage
3) poor compressive strength
4) concerns over expansion on setting
5) poor aesthetics
- use limited to posterior teeth

Question 6

glass ionomer cements

Answer 6

GIC
set chemically
fuji
9

Question 7

RM GIC

Answer 7

fugi 2 LC

Question 8

ad/dis of GIC

Answer 8

1) adhesive
2) good marginal seal and more resistant to wear
3) biocompatibility
4) release of fluoride
- effective?
5) improved aesthetics compared to ZOE
- not as good as resin modified or resin
Disadvantages
1) Limited to biocompatibility near to the pulp tissue
2) more expensive than ZOE
3) initially weak compressive strength, improves with time
4) More time consuming to remove
- similar colour to dentine
- adhesive