7. Class II Amalgam Restoration

Question 1

Select the Matrix band
Universal #1 (____”)
Medium MOD (____)
Wide MOD#2 (____”)

Answer 1

0.0015”
Pediatric
0.002”

Question 2

Place the matrix band
Squeeze the ends of the band to form a loop
Smaller diameter ____
Larger diameter ____

Answer 2

gingival

occlusal

Question 3

Slip matrix band over the tooth
Tighten around tooth with retainer
Band should extend below the gingival floor by ____mm
No tissue entrapment!
Band should extend above the marginal ridge area by ____mm

Answer 3

1

1

Question 4

Insert wooden wedge into interproximal area from the ____

Gently press into position until band exhibits a tight adaptation against the gingival cavosurface of the preparation

Answer 4

lingual

Question 5

Wedging
Helps obtain tight ____ between new restoration and adjacent tooth surface
By separating the teeth sufficiently to compensate for space occupied by matrix band

Helps obtain proper interproximal ____
Separation creates sufficient interproximal bulk to
allow for correct curvatures
Triangular shape of wedge is like the ____

Answer 5

contact
contour
gingival embrasure

Question 6

Wedging
Prevents against occurrence of ____ (“gingival overhang”)
The matrix band is compressed securely against the gingival margin
Seals the gingival margin so amalgam cannot be condensed into gingival sulcus

Answer 6

gingval excess

Question 7

Wedging
The wedge is placed from the lingual (larger embrasure there the toffelmire matrix won’t interfere with the wedge placement
Apex of triangle is toward ____
Base of the wedge is toward ____

Answer 7

occlusal

gingival

Question 8

Wedging
Be sure that wedge does not cause a ____ in the interface between the tooth and the matrix strip
If so, remove wedge Reshape wedge
Select new wedge Repeat placement

Wedge must be below
____ of the preparation

Answer 8

concavity

gingival margin

Question 9

Wedging
Inspect closed buccal, lingual and gingival seal
Slightly loosen band by turning middle adjustment ____ turn after the wedge has been placed.
Burnish the matrix band against the adjacent tooth
Ball burnisher
Burnish in a ____ direction

Answer 9

1/4

B-L

Question 10

Dispersalloy Double Spill

• ____
• Average ____-surface restorations

Answer 10

admixed

two

Question 11

5. Place the Amalgam
   The first increment of amalgam is placed in the proximal box with nozzle of amalgam carrier as close to ____ as possible
   Squeeze out the amalgam from the carrier

Answer 11

gingival wall

Question 12

Placing the Amalgam
This increment is condensed 1st into the most retentive areas: ____ of the box, then against the ____ and against ____
Use #1-2 or 1P condenser
Rocking and wiping motion under
firm hand pressure
Be sure to condense into proximal cavosurface areas using ____ condensation

Answer 12

point angles
wall angles
gingival wall
lateral

Question 13

Placing the amalgam
- Then, the amalgam is condensed proximally against the band to secure a tight contact
Condensation with the side of the plugger adapts the amalgam into the margins of the box at the interface with the matrix band
____ the box before moving to the occlusal

Answer 13

overfill

Question 14

7. Removing the matrix
   Wait approximately ____ minutes until the amalgam has started to set
   Refine occlusal contours Remove the wedge

Answer 14

3-4

Question 15

Remove band by sliding it ____ and ____ with hemostat (or cotton pliers)
Be careful not to damage the contact or the marginal ridge!

Answer 15

buccally

occlusally

Question 16

Use the explorer, IPC carver, excavator, or hollenback to remove any excess (“flash”) at the buccal, lingual, and gingival (“overhang”) cavo- surface margins of the box
Establish proper embrasure contours
Always keep some part of the carving instrument in contact with natural ____

Answer 16

tooth surface

Question 17

Recontour the marginal ridge
Marginal ridge is not ____buccolingually
Establish proper curvature occluso- gingivally

Answer 17

flat

Question 18

Proximal Carving and contouring
Position contact area correctly ____
Proximal contact area is ____ to the height of the marginal ridges
Creates the occlusal and gingival embrasure spaces

Answer 18

O-G

gingival

Question 19

Proximal Carving and contouring
Position contact area correctly ____
Proximal contact based on ____ from Dental Anatomy
Creates the buccal and lingual embrasure spaces

Answer 19

B-L

material

Question 20

A dry ____ can be used to remove debris
Floss also may be used to remove debris, but be careful:
-contact can be removed if the amalgam is soft

Answer 20

cotton pellet

Question 21

Occlusion
The occlusal markings in an ideal tooth relationship for tooth #30:
____ cusp marking from contact with mesial marginal ridge #3
____ cusp marking from contact with central fossa #3
____ marking from contact with DL cusp #3
____ marking from ML cusp #3
No ____ Marking on #30!

Answer 21

MB
DB
D marginal ridge
central fossa
mesial marginal ridge

Question 22

The occlusal markings in an ideal tooth relationship for tooth #14:
____ marking from contact with the MB cusp tip of #19
____ cusp tip marking from contact with the central fossa of tooth #19
____ cusp tip marking from contact with the D marginal ridge of #19
____ area marking from the DB cusp of #19
NO ____ marking on #14!

Answer 22

mesial marginal ridge
ML
DL
central fossa
distal marginal ridge

Question 23

Common Problems with Class II Restorations

Interproximal excess “____” (resultant overhang)

Undercarved/bulky proximal or no ____ was placed

Flat or angular proximal contour

Remaining amalgam ____

Marginal ridge left too
high (resultant fractured
amalgam)

Open contact

Answer 23

flash
wedge
debris