Class II Restorations

Question 1

Caries Removal Considerations
•Caries on the axial wall …
•Caries on the pulpal floor …

Answer 1

….does not indicate cutting the entire axial wall
toward the pulp. Only remove caries.
….may necessitate widening of the
preparation to remove caries, but don’t deepen the entire pulpal
floor to the depth of the caries. Use a round bur or spoon excavator
to remove caries and accept an irregular pulpal floor.
•If recurrent caries extends gingivally in the box area, it is
permissible and preferable to have a “box within a box” rather
than deepening the entire box gingivally unless caries requires it.

Question 2

Add a liner only to the

Answer 2

deepest parts of the
preparation, closest to the pulp.

Question 3

Keep the liner material away from the

Answer 3

margins

Question 4

Liner materials:
(2)

Answer 4

•Calcium hydroxide
•Resin Modified Glass Ionomer

Question 5

•Calcium hydroxide
(2)

Answer 5

•Brand names: Life, Dycal
•Use on deepest preps- pulp capping material

Question 6

•Resin Modified Glass Ionomer
(3)

Answer 6

•Brand name: Vitrebond
•Light cured
•Releases fluoride over time

Question 7

Restoration Should be Supported by
at Least a — of Natural Structure

Answer 7

Tripod

Question 8

Do not have the entire floor of the restoration covered by

Answer 8

calcium
hydroxide.
•CaOH is too soft to support the restoration.

Question 9

If the material is hard when set (such as glass ionomer) the entire pulpal
floor can be

Answer 9

covered material
but the material must rest on a

Question 10

The Functions of a Good Matrix
Band:
(5)

Answer 10

1. Has enough rigidity to resist too much deformation by packing
   forces or wedging, but is slightly burnishable and displacable (in
   order to get good contact with the adjacent tooth). Can’t be too
   stiff or thick.
2. Assists in establishing proper anatomical contour. Again, can’t
   be too stiff or thick.
3. Must prevent excess amalgam from being expressed at the
   gingival margin as much as possible, so as not to get a gingival
   overhang that will trap plaque and irritate the gingivae.
4. Must be convenient to install.
5. Must be easy to remove and allow for removal
   without breaking a partially set amalgam.

Question 11

Restoration – Matrix and wedge
•DO NOT USE CLEAR MATRIX BAND
(4)

Answer 11

•Too much flash
•Poor contours
•Reservoir for moisture
•Overall terrible

Question 12

ETCH- Complete vs. Selective
•Complete
(5)

Answer 12

•Place etch on enamel first, followed by
dentin
•ETCH ENAMEL 20-30 SECONDS
•ETCH DENTIN 15-20 SECONDS
•Rinse and gently air dry
•Typically only done with total-etch and

Question 13

ETCH- Complete vs. Selective
•Selective
(5)

Answer 13

•Etch enamel only
•20-30 seconds
•Rinse and air dry
•Can only be done with certain bond agents
•Universal (what we use in clinic and lab) and Self-
etch types

Question 14

Do not desiccate the dentin
This results in

Answer 14

collapse of collagen layer (more on that later) and reduced bond strengths
•Optional:•Place a cotton pellet over the dentin to avoid desiccating it