Matrix Band & Retainer

Question 1

Where is the band placed?

Answer 1

Between the interdental papilla & the proximal surface of the tooth

Question 2

What corresponding tooth would a band fit that was already set for tooth #28?
(LR 1st BICUSPID)

Answer 2

Tooth #12

UR 1st BICUSPID

Question 3

What can be used to secure the band in place?

Answer 3

Low fusing compound heat soft/melted & applied on band and tooth

Question 4

What is the purpose of the contra angle retainer?

Answer 4

Retainer placed from the lingual instead of the buccal/facial surface

Question 5

How far should the band extend above the occ height and below the gingival margin of the prep?

Answer 5

1 1/2 to 2 mm above occ height

1 mm below gingival margin of prep

Question 6

Would you need a matrix band on a Class 1 cavity prep?

On a Class 2 prep?

Answer 6

Not on a Class 1

Yes on a Class 2 b/c post prox wall(s) are missing

Question 7

What is the shape of most commercial wedges and what are their purposes?

Answer 7

Triangular shape
Placed with the short flat base toward the gingiva
Purpose: flush the matrix band to the prox surf of the missing wall to watch the natural shape of the tooth

Question 8

What may result with inadequate placement of the matrix band & wedge?

Answer 8

Overhang & open contacts

Question 9

What is the purpose of a matrix band?

Answer 9

To replace the mixing proximal wall