interim restoration materials

Question 1

polymethyl methylacrylate pros and cons

Answer 1

Question 2

polyethyl methylacrylate pros and cons
polishing, shrinkage, heat, staining, hardness, strenght, durability, fx?

Answer 2

w

Question 3

polyvinylmethyl acrylate pors and cons

Answer 3

Question 4

bis-acryl pros and cons

Answer 4

Question 5

VLC pros and cons

Answer 5

Question 6

Poly(methyl methacrylate) – PMMA advantages

Answer 6

*Good marginal fit
*Good transverse strength
*Polishes well
*Durability / color stability

Question 7

monomer? thermal? shrink? abrasion?

Poly(methyl methacrylate) – PMMA disadvantages

Answer 7

*Toxic monomer
*High exothermia
*High volumetric shrinkage (8%)
*Low abrasion resistance

Question 8

temps? monomer?

Problems with PMMA

Answer 8

*PMMA can generate temperatures of 70oC or higher in the pulp chamber as material goes through polymerization.
*Free monomer contact with tissues → chemical burns, allergic reactions.
*Monomer vapor is harmful.

Question 9

PMMA shrinkage

Answer 9

*A volumetric shrinkage of ~8% occurs on polymerization.
*A 2% reduction in crown diameter results in a high marginal discrepancy.
*Results when polymerization occurs off the tooth. Rosenstiel

Question 10

thermal? shrink?

Poly(R’ methacrylate) advantages

Answer 10

*Less exothermia
*Less shrinkage

Question 11

toxic? hardness? strength? durability? fx? color?

Poly(R’ methacrylate) disadvantages

Answer 11

*Toxic monomer
*Poor:
Surface hardness
Transverse strength
Durability
Fracture toughness
Color stability

Question 12

margin? thermal? shrink? hardness? biocomp?

Bis-Acryl Resins (Composite) advantages

Answer 12

*Good marginal fit
*Low exothermia
*Low shrinkage
*Good surface hardness and
abrasion resistance
*Good biocompatibility, color
stability, and patient acceptance

Question 13

polish? lacks what stage? cost? brittle?

Bis-Acryl Resins (Composite) disadvantages

Answer 13

*Limited polishability: Improved surface finish w/ resin glaze
*No doughy/rubbery stage
*↑ Cost
*Brittleness

Question 14

Problems associated with Interim
Restorations
*Time?
*Time the interim is required to function?
*Materials?
*Management of ?
*Reline / modification / repair?
*Treatment of?
*Grinding?
*Roughening / sandblasting / bonding agent?

Answer 14

*Time required for fabrication
*Time the interim is required to function in the mouth
*Materials available for fabrication
*Management of deficiencies
*Reline / modification / repair
*Treatment of the fractured or defective surfaces
*Grinding to expose fresh surfaces; removing enough to
provide adequate thickness and ability to complete re-
seating of restoration
*Roughening / sandblasting / bonding agent
*Composite – flowable composite resin

Question 15

ØTypes of Provisional Cements

Answer 15

*Zinc Oxide – Eugenol cements (Temp Bond)
*Non-eugenol cements: Polycarboxylate cement w/ plasticizers (Ultratemp), Glass ionomer-based cement – modified (Smart Temp), Resin Cement (modified low strength) (TelioCS Link)

Question 16

ZOE
strength?
sedative/bacteria?
poly?

Answer 16

*Low strength
*Sedative (obtundant) and bactericidal
*Inhibition of resin polymerization

Question 17

*Polycarboxylate cement w/ plasticizers (Ultratemp)
strength?

Answer 17

*Low strength final cement

Question 18

Glass ionomer-based cement – modified (Smart Temp)
used when?

Answer 18

longer term cement

Question 19

Resin Cement (modified low strength) (TelioCS Link)
*Especially helpful for?
restorations
* color?

Answer 19

*Especially helpful for planned bonded-ceramic
restorations
*Translucent

Question 20

Provisional Cementation method

Answer 20

*Equal amounts of base and catalyst are mixed together on a mixing pad.
*The material is mixed with a small spatula until homogenous.
*Mixing Syringe is also available (Ultratemp / Telio CS Link).