quiz 8 - modified class II cavity prep

Question 1

class II cavity :
occlusal depth:
axial wall depth:

buccal, lingual, gingival clearance:

Answer 1

occlusal depth: 1.5 - 2.0 mm
axial wall depth: 1.2 mm - 1.5 mm MD

b, l, g clearance: .5 - 1.0 mm

Question 2

class II cavity : lingual extension:

pulpal floor:
axial wall depth:
axial wall:

Answer 2

pulpal floor: 1.5 - 2 mm
axial wall depth: 1.0 mm BL at lingual extension
Axial wall: .5 mm into dentin

Question 3

How many retentive grooves for amalgam?

Answer 3

4.
2 within the distal box area
2 within lingual extension

Question 4

When to use modified cavity class II prep?

Answer 4

When caries extend towards the small distal cusp > 2/3 the distance.

Question 5

Areas of cusp replacement reduced _ mm at minimum:

why do u do this?

Answer 5

2 mm

to avoid fracture of amalgam. For resistance.

Question 6

Retentive grooves:

Answer 6

axio-buccal line angle
axio-lingual line angle
-distal wall. 0.25 mm at deepest point and fade out at the DEJ