DMS-temporary materials

Question 1

Give the following for PMMA monofunctional :

Example

Use

Duration

Answer 1

Example - Jet

Use- Short and long bridges

Duration- long term.

Question 2

Give the following for PEMA :

Example-

Use-

Duration-

Answer 2

Example- Trim II

Use- single crowns

Duration- short term

Question 3

Give the following for Bis-acryl composite bifunctional.

Example

Use

Duration

Answer 3

Example- Protemp 4

Use- Short span bridges

Duration- Long term

Question 4

What are the key properties for a temporary material?

Answer 4

Low temperature rise during polymerisation. (the temp material encapulates the tooth prep- so thermal release is a safety issue.

Colour stability- we do not want the colour to change easily due to staining.

Low Polymerisation shrinkage- gives a good clinical fit of the temporary restoration.

High Compressive strength to withstand biting forces.

High Abrasion resistance- to resist the wear down of the surface.

Question 5

How do you measure the fit of the temporary restoration?

Answer 5

by looking at the marginal discrepancy (how big a gap there is at the margins)