Self retentive class II box

Question 1

What is a class II box?

Answer 1

Interproximal box in posterior teeth

Question 2

What is the free running speed of the air turbine handpiece?

Answer 2

450,000rpm

Question 3

How much do we weaken the impact strength of a tooth by removing fissures?

Answer 3

20%

Question 4

What needs to be present in order to achieve a good seal of the filling material?

Answer 4

a smooth surface

Question 5

what do we etch with?

Answer 5

36% orthophosphoric acid (buffered)

Question 6

What is the bond strength of a composite?

Answer 6

30MPa

Question 7

What sort of bond does Penta form?

Answer 7

ionic bond

Question 8

What sort of bond does Haema form?

Answer 8

Covalent bond

Question 9

Whats an example of penta?

Answer 9

phosphate ether = flows and penetrates better = lowers contact angle and wets surface better

Question 10

Whats an example of haema?

Answer 10

2 hydroxymethyl methacrylate (bonds to collagen)

Covalent to Collagen

Question 11

What is paladent?

Answer 11

A sectional matrix

Question 12

In which directions are sectional matrices curved?

Answer 12

Laterally and occlusogingivally